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<document>
<properties>
<title>Apache log4j 1.2</title>
</properties>
<body>
<release version="1.2.16" date="2010-04-06" description="Maintenance release">
<action issue="43313">log4j 1.2.16 release preparation.</action>
<action action="add" issue="42842">Create a public identifier for log4j.dtd ("-//APACHE//DTD LOG4J 1.2//EN")</action>
<action action="fix" issue="44108">TelnetAppender misses messages when one of many clients disconnect.</action>
<action action="fix" issue="44109">TelnetAppender throws null pointers at log time when socket couldn't be opened.</action>
<action action="fix" issue="44032">ThrowableInformation.getThrowableStringRep can return null strings.</action>
<action action="fix" issue="43298">log4j.dtd defines class attribute for category element, but not for logger.</action>
<action action="fix" issue="43314">SMTPAppender.setSMTPUserName and others missing @since tags.</action>
<action action="fix" issue="43618">Request for compile-on-Windows help file in src package.</action>
<action action="fix" issue="43599">AsyncAppender failing on changing message objects.</action>
<action action="fix" issue="43325">Subst-mechanism in DOMConfigurator broken.</action>
<action action="fix" issue="43374">DailyRollingFileAppender may lose messages during failed rollover attempts.</action>
<action action="fix" issue="43312">Fix mangled source-repository.html.</action>
<action action="fix" issue="43387">Minor documentation changes.</action>
<action action="fix" issue="43304">Make javamail, jmx, jms dependencies optional in pom.xml.</action>
<action action="add" issue="43874">SocketHubAppender should expose actual port in use to extending classes.</action>
<action action="add" issue="44551">SocketHubAppender in the 1.2.16 does not support a scroll back buffer or application property</action>
<action action="add" issue="41156">Give log4j threads reasonable names.</action>
<action action="fix" issue="44888">LocationInfo can report wrong caller when other class names contain logger class name as substring.</action>
<action action="fix" issue="45426">ErrorHandlerTestCase is not run and does not pass.</action>
<action action="fix" issue="45485">Agent.java is sole dependency on jmxtools.jar with Java 5+.</action>
<action action="fix" issue="44517">Eliminate compile dependency on non-redistributable JMS reference implementation.</action>
<action action="fix" issue="37182">Exception in call to toString of message propagates to caller.</action>
<action action="fix" issue="45299">Javadoc class index corrupted by JDBCAppender deprecation warning.</action>
<action action="fix" issue="43867">Improve warning message when log4j is accessed after unload by Tomcat.</action>
<action action="fix" issue="45335">NullPointerException in NDC.remove after unload by Tomcat.</action>
<action action="fix" issue="36384">Configuring triggering/rolling policies should be supported through properties.</action>
<action action="fix" issue="25747">More explanations when hitting WARN No appenders could be found for logger.</action>
<action action="fix" issue="45039">Use Throwable.getStackTrace to obtain location when running on JDK 1.4 or later.</action>
<action action="fix" issue="44745">AsyncAppender fails on changing Throwable.</action>
<action action="fix" issue="44899">Extra NPE error message when using missing appender class with DOMConfigurator.</action>
<action action="fix" issue="44555">org.apache.log4j.varia.NullAppender lacks static accessor to static instance.</action>
<action action="fix" issue="43849">Javadoc for Appender.getName implies that the return value will be unique and not null.</action>
<action action="fix" issue="40888">Weekly rotation problem in Europe.</action>
<action action="fix" issue="43282">Add OSGi packaging info.</action>
<action action="fix" issue="44157">InterruptedIOException ignored by log4j.</action>
<action action="fix" issue="40246">HierarchyDynamicMBean missing unregister MBean</action>
<action action="fix" issue="45635">Support -Dm2_repo option on Maven build for non-default Maven repository location.</action>
<action action="fix" issue="45636">2 tests for DateLayout are failing because of ill initialized DateFormat.</action>
<action action="fix" issue="45659">Incorrect user mailing list URL.</action>
<action action="add" issue="44386">NTEventLogAppender.dll for 64-bit editions for Microsoft Windows.</action>
<action action="add" issue="45721">Add configuration of ThrowableRenderers and add org.apache.log4j.EnhancedThrowableRenderer.</action>
<action action="fix" issue="45969">SMTPAppender does not force evaluation of message at request time</action>
<action action="add" issue="25355">Support SSL transport in SMTPAppender</action>
<action action="add" issue="45980">SMTPAppender should have a sendOnClose option</action>
<action action="fix" issue="45982">Support %X layout specification to output all MDC key-value pairs</action>
<action action="add" issue="45990">Add replyTo attribute to SMTPAppender</action>
<action action="fix" issue="44644">SMTPAppender does not properly encode subject or content containing non-ASCII characters.</action>
<action action="fix" issue="46388">Clarify javadoc of Layout.ignoresThrowable.</action>
<action action="fix" issue="46271">SyslogAppender.append throws exception if layout is not set.</action>
<action action="fix" issue="46144">QuietWriter.write should check for null argument.</action>
<action action="fix" issue="46512">LogFactor5 CategoryPath doesn't replace slashes with dots.</action>
<action action="fix" issue="46163">LoggerDynamicMBean needs to handle a null Appender name.</action>
<action action="fix" issue="45704">DOMConfigurator.configure(URL) fails on JRE 1.5.0_16.</action>
<action action="add" issue="44357">Document system properties used by log4j.</action>
<action action="fix" issue="44038">log4j is susceptible to exceptions in Exception.printStackTrace.</action>
<action action="fix" issue="46741">Misuse of "it's" in Javadoc for PatternLayout.</action>
<action action="add" issue="47142">Add SMTPAppender.formatBody to simplify extension.</action>
<action action="fix" issue="46404">Failure when toString() of throwable performs logging in SocketAppender, SocketHubAppender and JDBCAppender.</action>
<action action="fix" issue="47465">Reading configuration files from a JAR locks the JAR file</action>
<action action="add" issue="38061">PropertyConfigurator does not support configuring ErrorHandler.</action>
<action action="fix" issue="47967">log4j.ignoreTCL should apply to the getResource method in addition to the loadClass method of org.apache.log4j.helpers.Loader.</action>
<action action="fix" issue="46539">The QuietWriter class does not live up to its published contract.</action>
<action action="add" issue="46983">More Debug output for log4j auto-configure requested.</action>
<action action="add" issue="47107">Add MDC.clear().</action>
<action action="fix" issue="47547">NullPointerException when calling Category.removeAllAppenders().</action>
<action action="add" issue="28647">Allow overriding of flush strategy.</action>
<action action="fix" issue="47350">Add recommendation to use EnhancedPatternLayout to avoid synchronization issues in PatternLayout</action>
<action action="fix" issue="45481">Source contains unnecessary imports.</action>
<action action="add" issue="48159">Add LoggingEvent.removeProperty</action>
<action action="add" issue="48187">Typo ("two three goals") in log4j FAQ</action>
<action action="fix" issue="48531">Unit tests fail for system dates after 2009-12-31</action>
<action action="fix" issue="48604">Download page does not have link to KEYS file</action>
<action action="add" issue="49812">Add parameterized logging utility classes LogMF and LogSF from extras companion.</action>
<action action="add" issue="48927">Add EnhancedPatternLayout from extras companion.</action>
<action action="fix" issue="48784">Links to example code broken in the JavaDocs</action>
<action action="fix" issue="48953">Unused imports and variables in test code cause gcj compile warnings.</action>
<action action="fix" issue="49002">Unit tests fail on Apache Harmony and gcj due to stack trace expectations.</action>
<action action="fix" issue="49003">SocketServerTestCase.test8 fails on Apache Harmony.</action>
<action action="fix" issue="49004">TestLogMF.testDebugDate fails on gcj.</action>
<action action="fix" issue="49005">TelnetAppenderTest.testIt fails on gcj.</action>
<action action="fix" issue="49006">Eclipse Java Compiler and gcj do not support -source=1.2.</action>
<action action="fix" issue="49007">CachedDateFormatTest fails on Apache Harmony.</action>
<action action="add" issue="49010">Add %p{-2} pattern to EnhancedPatternLayout to drop two leading elements from name.</action>
<action action="add" issue="48902">Add %throwable{n} and {-n} pattern to EnhancedPatternLayout to print n or drop last n lines.</action>
</release>
<release version="1.2.15" date="2007-08-24" description="SyslogAppender enhancements, NTEventLogAppender and Maven build.">
<action issue="40951">log4j 1.2.15 release preparation.</action>
<action action="add" issue="40212">Switch to NOPLoggerRepository if application reloading nulls repositorySelector.</action>
<action action="add" issue="43202">Add 'application' property support to SocketAppender (from 1.3)</action>
<action action="fix" issue="43200">Log4JEntityResolver will return null if log4j.dtd can not be found on classpath.</action>
<action action="fix" issue="37736">HierarchyEventListener.removeAppenderEvent never called.</action>
<action action="fix" issue="37560">XMLLayout does not escape CDATA sections within NDC or throwables.</action>
<action action="add" issue="33502">Added test to confirm that DOMConfigurator.configureAndWatch does configure.</action>
<action action="fix" issue="32527">Default initialization with XML file halts program if JAXP not available.</action>
<action action="add" issue="17531">Add reset option to PropertyConfigurator and DOMConfigurator.</action>
<action action="fix" issue="14350">Error message always logged to LogLog when calling close on TelnetAppender.</action>
<action action="add" issue="32572">Add configurable triggeringPolicy for SMTPAppender.</action>
<action action="fix" issue="43181">NullPointerException in MDC on Tomcat reload.</action>
<action action="fix" issue="34874">Notice to use UTF-8 or UTF-16 encoding added to XML and HTMLLayout javadoc.</action>
<action action="fix" issue="34875">XML and HTMLLayout do not always escape special characters.</action>
<action action="add" issue="43078">Optionally render MDC content in XMLLayout</action>
<action action="fix" issue="42694">Typo in log4j.dtd concerning threshold.</action>
<action action="fix" issue="42611">ERFATestCase fails on some JDK's.</action>
<action action="fix" issue="42585">SocketNode can leak Sockets.</action>
<action action="fix" issue="37930">Migrate to Maven based build and documentation.</action>
<action action="fix" issue="40604">Prepare Maven release bundles.</action>
<action action="fix" issue="42283">Eclipse compiler warning cleanup.</action>
<action action="fix" issue="42281">JRockit VM and java-gcj fail unit tests.</action>
<action action="fix" issue="21796">SocketAppender does not use FallbackErrorHandler</action>
<action action="add" issue="42257">Enhance DOMConfigurator to delegate unrecognized elements to configured object.</action>
<action action="add" issue="42108">Add LoggingEvent accessors.</action>
<action action="fix" issue="42017">InstanceAlreadyExistsException using MBean.</action>
<action action="fix" issue="29227">Reduce first connection failure severity in SocketAppender</action>
<action action="fix" issue="42087">SyslogAppender does not limit packets to 1024 bytes.</action>
<action action="fix" issue="41040">SyslogAppender: Added "header" property which if set to true will cause the appender
to produce the HEADER part (timestamp and hostname) of the syslog packet.
Default value is false for compatibility with previous behavior.</action>
<action action="fix" issue="40161">SyslogAppender also now sends any header from the associated
layout when activateOptions is called or first logging event is sent and
any footer when the appender is closed.</action>
<action action="fix" issue="37282">SyslogAppender leaks descriptors</action>
<action action="fix" issue="40502">SyslogAppender assumes all lines start with tab</action>
<action action="fix" issue="42087">SyslogAppender does not limit packet size to 1024 bytes</action>
<action action="fix" issue="41169">NTEventLogAppender: Updated NTEventLogAppender.dll which corrects missing event messages
and which should work with earlier releases of log4j.
NTEventLogAppender.dll also now supports registration and unregistration
using regsvr32. If replacing an existing copy of NTEventLogAppender,
use "regsvr32 NTDllEventLogAppender.dll" or manually remove the
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Eventlog/Application/Log4J
registry key.</action>
<action action="fix" issue="39437">NTEventLogAppender.dll performs unnecessary code page conversion using code copied from book.</action>
<action action="fix" issue="40944">PropertyConfigurator.configure(URL) does not close resource stream.</action>
<action action="fix" issue="40937">In Turkish locale level "info" is not equivalent to "INFO"</action>
<action action="fix" issue="41339">Javadoc of PatternLayout should use %n in TTCC layout examples</action>
<action action="fix" issue="41219">Stacktraces of exceptions disappear occassionally</action>
<action action="fix" issue="38680">Incorrect message when specified custom level class does not implement toLevel</action>
<action action="fix" issue="41487">Warning when configuring inner-class logger</action>
<action action="fix" issue="41186">AsyncAppender in 1.2.14 DiscardSummary events create NullPointerExceptions in layouts</action>
<action action="fix" issue="37864">Add target to generate binary and source compatibility report</action>
<action action="fix" issue="41708">PropertyPrinter.printOptions breaking signature change in log4j 1.2.9</action>
<action action="fix" issue="41735">RollingFileAppender may delete files during rollover</action>
<action action="fix" issue="33708">XMLConfiguration of loggerFactory does not work</action>
<action action="fix" issue="42087">SyslogAppender does not limit packet size to 1024 bytes</action>
<action action="fix" issue="40755">Update source per new ASF Header Policy.</action>
<action action="fix" issue="41373">DateLayoutTest fails if default Locale is not en_US.</action>
<action action="fix" issue="35324">Stacktrace may choke on null fields.</action>
<action action="add" issue="41575">Add projects.apache.org project descriptor.</action>
</release>
<release version="1.2.14" date="2006-09-18" description="AsyncAppender rewrite, Syslog and SMTPAppender enhancements.">
<action action="fix" issue="38137">Monitor deadlock in AsyncAppender.</action>
<action action="fix" issue="28006">AsyncAppender: Dispatcher should run at normal prio.</action>
<action action="fix" issue="37904">AsyncAppender wait forever when buffer is full.</action>
<action action="add" issue="38982">Add non-blocking option for AsyncAppender.</action>
<action action="add" issue="39687">Add SyslogPort option to SyslogAppender.</action>
<action action="add" issue="19125">Add cc and bcc addresses to SMTPAppender.</action>
<action action="add" issue="24969">Add password authentication to SMTPAppender.</action>
<action action="fix" issue="40159"> NullPointerException in org.apache.log4j.NDC.get.</action>
<action action="fix" issue="36787"> org.apache.log4j.lf5.util.DateFormatManager.setTimeZone assignment error.</action>
<action action="fix" issue="38559"> Monthly logs not generated at midnight with DailyRollingFileAppender.</action>
<action action="fix" issue="40145"> PatternLayout specifier %r is not consistent with documentation.</action>
<action action="fix" issue="37119"> Space after log level causes default level to be used.</action>
<action action="fix" issue="39135"> Bad patterns in ISO8601DateFormat and DateTimeDateFormat.</action>
<action action="fix" issue="35743"> SyslogAppender throws NullPointerException upon misconfiguration.</action>
<action action="fix" issue="15501"> FallbackErrorHandler throws NullPointerException if no loggers are set.</action>
<action action="fix" issue="38564"> Bad documentation for WriterAppender.encoding.</action>
<action action="fix" issue="37866"> NTEventLogAppender not build, tested and placed in distribution.</action>
<action action="fix" issue="38662"> SMTPAppender does not output newlines between stack trace lines.</action>
<action action="fix" issue="30294"> SMTPAppender will not run within sandbox.</action>
<action action="fix" issue="16922"> MDC with SMTPAppender doesn't work.</action>
<action action="fix" issue="31507"> Misspelling in HierarchyDynamicMBean.</action>
<action action="fix" issue="35123"> Additivity not exported by PropertyPrinter.</action>
<action action="fix" issue="31003"> RollingFileAppender, if removed, can cause NullPointerExceptions.</action>
<action action="fix" issue="23021"> AsyncAppender blocks on thread death.</action>
<action action="fix" issue="40412"> NOTICE file added to distribution and jars.</action>
<action action="fix" issue="40378"> Chainsaw of log4j 1.2 does not show TRACE level.</action>
<action action="fix" issue="40501"> TRACE level missing in short introduction to log4j.</action>
<action action="fix" issue="37960"> Update site generation to velocity 1.4 and remove dependency on logging/site project.</action>
</release>
<release version="1.2.13" date="2005-12-04" description="TRACE level missing info fixed, ConsoleAppender.follow added to make redirection following an optional behavior.">
<action action="fix" issue="36800">Location info missing for TRACE level messages.</action>
<action action="fix" issue="37122">Console appender now behaves as before to fix
compatibility problem with JBoss introduced in 1.2.12 release due to fix
for bug 31056. Can still be configured to detect changes in the System.out
and System.err streams as needed by setting the follow property.</action>
</release>
<release version="1.2.12" date="2005-08-29" description="TRACE level introduced, ConsoleAppender modified to follow redirection of System.out">
<action action="fix" issue="36262">Removed final qualifiers on member variables
in org.apache.log4j.chainsaw.LoggingReceiver which would cause
spurious compiler errors with JDK 1.1 and 1.2 javac compilers.</action>
<action action="fix" issue="36267">Added a jndi.jar property to the build.xml.</action>
<action action="fix" issue="37268">Added "release" target to build.xml.</action>
<action action="fix" issue="36213">Removed references to obsolete documentation.</action>
<action action="fix" issue="35965">Added protected accessors for member variables
topicConnection, topicSession, and topicPublisher.</action>
<action action="fix" issue="34026">SyslogAppender now checks Layout.ignoresThrowable() just
like every other appender.</action>
<action action="fix" issue="35947">DOMConfigurator would call LogLog.error to report
XML validation errors that caused no problems in the interpretation of the
configuration file.</action>
<action action="fix" issue="14551">Fixed the JavaDoc links
for the XML sample files.</action>
<action action="fix" issue="35654">Added getNext/setNext methods to org.apache.log4j.spi.Filter and deprecated
public "next" field. This mirrors the same change in the upcoming 1.3
version and, hence, provides a migration path.</action>
<action action="fix" issue="35711">Added o.a.log4j.Logger.trace(), o.a.log4j.Logger.isTraceEnabled() and
o.a.log4j.Level.TRACE</action>
<action action="fix" issue="34758">Implemented serialization for Level.</action>
<action action="fix" issue="31056">o.a.log4j.ConsoleAppender would ignore redirections
of System.out and System.err that occurred after configuration.</action>
<action action="fix" issue="23705">o.a.log4j.xml.DOMConfigurator would not properly
interpret relative path names in external entity declarations.</action>
<action action="fix" issue="35691">o.a.log4j.xml.XmlLayout would not properly escape
class names that contained '&lt;' or '&gt;'.</action>
<action action="fix" issue="35052">Use of String.intern() in o.a.log4j.CategoryKey
would cause application to slow down.</action>
<action action="fix" issue="9150">o.a.log4j.FileAppender would not create log file
if parent directory did not exist.</action>
<action action="fix" issue="23021">o.a.log4j.AsyncAppender would deadlock if a
unchecked exception occurred in the attached appender causing the
dispatch thread to die.</action>
<action action="fix" issue="35516">Added jdiff target to build.xml.</action>
<action action="fix" issue="35831">log4j would not build with a JDK 1.5 javac.</action>
<action action="fix" issue="35893">Added log4j 1.1 compatibility method
to o.a.l.helpers.Loader.</action>
<action action="fix" issue="34981">Additional null terminating character in Windows
nteventlog.cpp code.</action>
<action action="fix" issue="36332">Broken links to J2SE classes in javadocs.</action>
</release>
<release version="1.2.11" date="2005-06-18" description="JMS MessageRenderer fix">
<action action="fix" issue="34491">o.a.log4j.or.jms.MessageRenderer
would not be compiled in the build.jms target.</action>
</release>
<release version="1.2.10" date="2005-04-28" description="Version 1.2.10 was not released following the accepted rules and process of
the log4j project and Logging Services Project and was recalled and removed.
Please do not use version 1.2.10, it is not an official log4j release.">
<action>Version 1.2.10 was not released following the accepted rules and process of
the log4j project and Logging Services Project and was recalled and removed.
Please do not use version 1.2.10, it is not an official log4j release.</action>
</release>
<release version="1.2.9" date="2004-11-01" description="Deprecation of obsolete methods">
<action> Log4j version 1.2.9, is identical to version 1.2.8, except that
several key methods have been deprecated in preparation for version
1.3.0, the next major release of log4j. These changes are intended to
enforce the rule that client code should never refer to the Category
class directly, but use the Logger class instead. Similarly, client
code should not refer to the Priority class but to the Level class
instead.
For a more detailed discussion, refer to the document entitled
preparing for log4j 1.3 at:
http://www.qos.ch/logging/preparingFor13.jsp
</action>
</release>
<release version="1.2.8" date="2003-02-19" description="Fixes to XMLAppender, DOMConfiguration, SocketAppender and JDBCAppender.">
<action action="fix" issue="11570">XMLAppender would throw a
NullPointerException if the input message was null. Many thanks to
David Vandegrift for reporting the bug and to Hendrik Brummermann for
supplying the patch.</action>
<action action="fix" issue="12366">Various versions of Xerces would not parse
log4j configuration scripts expressed in XML format.</action>
<action action="fix" issue="14827">The "removes" buffer used in the flushBuffer() method
of JDBCAppender is now cleared, solving the memory leak. Thanks to John
Landers for reporting the bug and suggesting the fix.</action>
<action action="fix" issue="15599">SocketAppender now honors ReconnectionDelay of 0.
Many thanks to Scott Schram for reporting the bug and providing the fix.</action>
</release>
<release version="1.2.7" date="2002-10-09" description="log4j.xml now checked during default configuration.">
<action>Log4j now searches for the file log4j.xml as well as the file
log4j.properties during log4j initialization.</action>
</release>
<release version="1.2.6" date="2002-07-31" description="LoggingEvent.getLoggerName() added, JMSAppender enhancements.">
<action action="add">Add of new options in JMSAppender and new command line arguments in
JMSSink.</action>
<action action="add">Add new method getLoggerName() in LoggingEvent class. The
getLoggerName is the preferred way for accessing the logger
name. The public access categoryName field should not be accessed
directly. Similarly, added the getLevel method which is now the
preferred way of accessing the event's level. The public access
level field should not be accessed directly. The javadocs now mark
the categoryName and level fields as deprecated.
Modified existing appenders to comply with these new directives.</action>
<action action="fix">Log4j now will check if a system property named "log4j.ignoreTCL"
is set. If it is set, then it will ignore the Thread Context
ClassLoader when loading classes. This solves the irritating
"appender is not assignable to Appender" messages observed when
log4j.jar is loaded by multiple class loaders.
The error reporting for this problem was also improved.</action>
<action action="fix" issue="10528">Calling the MDC.get method with a null
argument would throw a NullPointerException.</action>
</release>
<release version="1.2.5" date="2002-07-05" description="AsyncAppender.close now closes nested appender.">
<action action="fix" issue="10185">Calling an AsyncAppender close method also closes the embedded
appender instances.</action>
</release>
<release version="1.2.4" date="2002-06-12" description="XMLLayout now handles embedded CDATA, JDBCAppender deprecated.">
<action>The JDBCAppender is marked as slated for replacement. Do not build
critical software using it.</action>
<action action="add">Add LF5 documentation and examples. Further tests are required
for full integration.</action>
<action action="fix">XMLLayout can now output messages which contain embedded CDATA
sections.Many thanks to Michael
A. McAngus for supplying the relevant patch.</action>
<action action="fix" issue="9750">The dispatcher thread associated with AsyncAppender is now marked
as a deamon thread.</action>
<action action="add" issue="9606">Add missing NTEventLogAppender.dll</action>
<action action="fix" issue="9435">log4j.dtd was changed so that
&lt;log4j:event&gt; is now made of logger and level attributes instead of
category and priority. Changed XMLLayout to conform to the
DTD. Chainsaw was changed to adapt to the XMLLayout.</action>
<action action="add">Add missing LevelRangeFilter file.</action>
</release>
<release version="1.2.3" date="2002-05-24" description="SyslogAppender and stack trace fixes.">
<action action="fix" issue="9285">SyslogAppender would incorrectly compute
the length of the datagram to send to the remote syslogd host.
Reported by Mamoru Kadota.</action>
<action action="fix" issue="8505">The stack trace of exception would not be
properly printed on the Compaq tru64 Unix platform. Initially
reported by Fabrice Claes and later by Espen H. Kolstad who also
provided the fix.</action>
</release>
<release version="1.2.2" date="2002-05-22"
description="NULL added as synonym for INHERITED in Configurators, Thread context loader used preferentially.">
<action>Log4j configurators take the "NULL" string value as a synonym for
"INHERITED". Both of these two strings are legal level values for
setting the level of a logger. Both values are case insensitive.</action>
<action issue="9305">When loading component classes, log4j will now first attempt to use
the Thread Context Loader and if that fails, it will use
Class.forName. In log4j 1.2 and 1.2.1, only Class.forName was used
and the TCL was ignored. This change is a response to bug #9305
opened by Scott M. Stark.</action>
</release>
<release version="1.2.1" date="2002-05-17"
description="Fixed MDC problem when used with AsyncAppender">
<action issue="9155" action="fix">
LoggingEvent.getMDCCopy() method now sets mdcCopyLookupRequired
instead of ndcLookupRequired. This bug would cause the wrong MDC
information to appear on a log server. It could only occur if the
client wrapped an AsyncAppender around a SocketAppender or if the
server used an AsyncAppender for its logging.</action>
</release>
<release version="1.2" date="2002-05-01" description="Initial release of log4j 1.2">
<action action="fix" issue="8527">A closed TelnetAppender would continue waiting
for connections even if its ServerSocket was closed. This caused
the TelnetSocket to sit in a loop and complain about the closed
socket.</action>
<action action="fix" issue="5444">AsyncAppender throws NullPointerException problem. The bug was actually in
AppenderSkeleton.</action>
<action action="add">Add support for recursive variable substiuton as requested by
Eric Chastan.</action>
<action action="fix" issue="3933">SocketNode now used a BufferedInputStream as suggested by Kok Chong</action>
<action action="fix" issue="7550">Fixed a problem with DailiyRollingAppender which would not
correctly compute the rollover period in certain timezones.</action>
<action action="fix" issue="2726">Fixed documentation bug #2726 in FAQ.html.</action>
<action action="fix" issue="2383">Added a flush statement in the
WriterAppender.writeFooter method.</action>
<action action="fix">In XMLLayout, escaped the method attribute. The
XMLLayout also outputs each item of a stack trace in a separate
line.</action>
<action action="fix" issue="5932">The
LoggingEvent.getMDCCopy method now clones the MDC instead of just
referencing it.</action>
<action>The ANT build script was modified to use jar files specified in
the build.properties file instead of the CLASSPATH environment
variable. The build.properties file depends on local paths and is
supplied by the user. The build.properties.sample file is included
in the distribution. The build.sh and build.bat scripts have
been removed. This is the way many other jakarta projects build their
projects. The jar files in the dist/lib directory were also removed
since they are no longer used.</action>
<action>The DOMConfigurator now interprets the string after the '#'
character in the value attribute within the &lt;level&gt; element as
the fully qualified class name of a custom Level. This is consistent
with the way log4j handles "level" values in other places. The
class attribute is still honored.</action>
<action action="add">Add Oliver Burn's chainsaw tool to the core log4j
distribution. Visualisation and dynamic filtering of log events is
bound to be a very important area of activity in the future.</action>
<action action="add">Add the org.apache.log4j.jdbc.JDBCAppender which as the name
indicates sends events to a database using the JDBC API. Thanks to
Kevin Steppe for supplying the code.</action>
<action action="add">Add SocketHubAppender class as contributed by Mark Womack. This
appender sends LoggingEvent objects to a set of remote a log
servers.</action>
<action>In the Category class, the getChainedPriority method has been
replaced with getEffectiveLevel method.</action>
<action>Replaced the custom class loading based on the thread context class
loader with a simple Class.forName() call. This solves two allied
but distinct problems encountered when using Ant with JUnit
although the bug is more general. In one instance of the
problem, log4j would throw java.lang.NoClassDefFoundError for
org/apache/log4j/AppenderSkeleton where log4j.jar and related
classes were clearly available to the Ant classloader. In another
incarnation, log4j would reject a custom appender claiming that it is
not assignable to a org.apache.log4j.Appender variable. This would
occur when log4j.jar was available to both the Ant classloader and the
system classloader.
Thanks to Dave Herman for providing detailed scenarios exposing
the issues involved. See
http://forum.java.sun.com/thread.jsp?forum=38&amp;thread=70946
http://forum.java.sun.com/thread.jsp?forum=38&amp;thread=70946#479697
http://marc.theaimsgroup.com/?l=ant-user&amp;m=101139178705895&amp;w=2
for more details.</action>
<action>Fixed the complaints the compiler issued when using the
Logger.setLevel() method.</action>
<action>Incorporated the performance enhancements to ISO8601DateFormat and
AbsoluteTimeDateFormat classes submitted by Andrew Vajoczki.</action>
<action>Source code written for log4j 1.1.3.jar will compile fine with
log4j 1.2X. However, code compiled for log4j 1.1.3 would previously
systematically throw "java.lang.NoSuchMethodError" runtime exceptions
when run with log4j 1.2 - prior to beta2. This problem has been
corrected in beta2. Pheew, that was a close one.</action>
<action>Log4j 1.2 is now backward compatible in serialization of
LoggingEvents. For example, a 1.1.3 SocketAppedner can write to 1.2
SocketServer. Similarly a 1.2 JMSAppender will work with 1.1.3
JMSSink. This should ease the move to log4j 1.2, especially in
large deployments.</action>
<action>The src/java/org/apache/log4j/examples/ directory moved under the
top-level directory as examples/.</action>
<action>Fixed the ArrayIndexOutOfBoundsException that was thrown by
AsyncAppender if multiple threads were trying to log an event
containing an exception near simultaneously. Thanks to Thomas Tuft Muller
for reporting this bug.</action>
<action>Improved error reporting in DOMConfigurator. Thanks to Thomas Tuft
Muller for contributing the enhancement.</action>
<action>Log4j is now configurable using JMX. JMX support is not of
production quality.</action>
<action action="add">Add support for different encodings in WriterAppender. Thanks to
Ben Sandee for submitting the relevant patch.</action>
<action>Modified SMTPAppender to allow multiple email sessions. Thanks to
Jon Skeet for supplying the relevant patch.</action>
<action>The CategoryFactory class has been replaced by the LoggerFactory
class. The makeNewCategoryInstance method has been renamed as
makeNewLoggerInstance. This change requires subclasses of Category
classes to be modified and recompiled.</action>
<action>The Level class replaced the Priority class. Priority class now
extends Level to preserve backward compatibility.</action>
<action>The Logger class replaced the Category class. Logger class
extends Category to preserve backward compatibility. We proudly
mark this change with a single star for 100% compatibility.</action>
<action>The Category.assert method has been replaced by
Category.assertLog. This change was necessary because assert is a
language reserved word in JDK 1.4.</action>
<action>Removed deprecated methods setOptions and getOptionStrings defined
in the org.apache.log4j.spi.OptionHandler interface. This interface
is implemented by most log4j appenders and layouts. In particular,
all appenders and layouts shipped with log4j contain these
deprecated methods. They have become totally redundant after we
moved to JavaBeans style configuration in log4j 1.1.</action>
<action>The disable(Level) methods in Hierarchy have been removed and been
replaced by threshold methods.</action>
<action action="add">Add buffered IO capability to FileAppender and subclasses.</action>
<action>The location information (or stack information) was not correctly
transmitted by JMSAppender.</action>
<action action="add">Add event reporting capability to the Hierarchy class.</action>
<action action="add">Add new system property "log4j.configuratorClass". This property
allows the user to specify the custom configurator at the default
initialization phase. This property replaces the previous
interpretation of the reference part of "log4j.configuration"
as the custom configurator class. This interpretation was sometimes
erroneous and caused headaches.</action>
<action>Introduced the Mapped Diagnostic Context or MDC class. This class
is similar to the NDC except that the diagnostic context is based
on a map instead of a stack. Moreover the MDC is automatically
inherited by child threads under JDK 1.2 and above.</action>
<action>Corrected a performance bug in the NDC class as observed by Dan
Milstein and independently by Ray Millard.</action>
<action>Removed deprecated methods disable(Priority), disableAll,
disableDebug, disableInfo and enableAll in BasicConfigurator.</action>
<action action="add">Add supports java.io.Reader objects in the method doConfigure(),
instead of only InputStream. Thanks to Mark Womack for submitting
the relevant patch.</action>
<action>Corrected the restart bug in DailyRollingFileAppender. Thanks to
Jim Moore for supplying the relevant patch.</action>
</release>
<release version="1.1.3" date="2001-06-19" description="Added missing namespace and reduced size of log4j-core.jar.">
<action action="add">Add a missing namespace declaration in the log4j:configuration
element in log4j.dtd. The missing declaration caused the new
generation of namespace aware parsers to barf when parsing log4j
configuration files.</action>
<action>Reduced the size of log4j-core.jar to 78KB.</action>
<action>Minor documentation changes.</action>
</release>
<release version="1.1.2" date="2001-06-07" description="Default initialization improvements">
<action>Corrected a problem with the static initializer of the Category
class which would use the wrong class loader to search for the
default configuration file. The associated search algorithm has
been also simplified. Nevertheless, the preferred method to specify
the automatic configuration file is by setting the
log4j.configuration system property.</action>
<action>Documentation improvements. Added a new section to the manual
explaining the default initialization procedure</action>
<action>Enhancements to the org.apache.log4j.examples.appserver package.</action>
<action>Corrected a bug in the way the NTEventLogAppender printed
exceptions.</action>
</release>
<release version="1.1.1" date="2001-05-20" description="Added custom priority support to PropertyConfigurator, SMTPAppender visibility changes.">
<action action="add">Add missing custom priority support in PropertyConfigurator.</action>
<action>Made a number of fields protected instead of default access in
SMTPAppender.</action>
</release>
<release version="1.1" date="2001-05-19" description="Minor documentation changes">
<action>This release has the same code as 1.1b7. It differs only in a few minor
documentation changes.</action>
</release>
<release version="1.1b7" date="2001-05-09">
<action>Made BasicConfigurator disable methods static as they were in log4j
1.0.4. Thanks to Francisco Marin for reporting the bug.</action>
<action issue="1505">Corrected a two related deadlock problems introduced while fixing
bug 1505. Thanks to joelr@viair.com for reporting the problem.</action>
<action issue="1686">The configureAndWatch methods in Configurators did not close the
configuration file, preventing its editing.</action>
<action>In DOMConfigurator.setParameter special character conversion now
precedes variable substitution. This change was suggested by Steven
Velez. The vast majority of users should be oblivious to it.</action>
<action>The TextPaneAppender is no longer maintained and has been
removed. It is still available under the contribs/
directory. This change has been discussed in the log4j mailing
lists and no one objected to the removal of the TextPaneAppender
class.</action>
</release>
<release version="1.1b6" date="2001-04-26">
<action issue="1505">Aaron Greenhouse from Carnegie Mellon SCS found a series of
multi-threading related bugs in Category and AsyncAppender. See bug
ids 1505 and 1507 in our bug database for exemplary bug
reports. They are worth the detour.</action>
<action>InvalidJarIndexException is only available in JDK 1.3. Referring
to this exception type caused log4j 1.1b5 to break on earlier JDKs.
We now avoid referring to it.</action>
<action action="add">Add PriorityRangeFilter by Simon Kitching. See the Threshold
option in AppenderSkeleton for a more convenient alternative.</action>
</release>
<release version="1.1b5" date="2001-04-22">
<action>In HTMLLayout, the Title option sets the HTML document
title (&lt;title&gt;...&lt;title&gt;).</action>
<action>Corrected an important performance bug in LocationInfo. Hein Couwet
and kr@it-practice.dk have independently identified the bug. This is
yet another example of the difference made by the number of eyeballs
studying source code.</action>
<action>Corrected the incorrect value returned by LocationInfo.getClassName
method when running under IBM Visual Age. Thanks to Mathias
Rupprecht for supplying the relevant patch.</action>
<action>Corrected a bug where the build.sh file in the distribution would be in
DOS CRLF format. Thanks to ma.darche@free.fr for reporting the
problem.</action>
<action>Corrected InvalidJarIndexException thrown in applets while
searching for the default log4j configuration file. Thanks to
Michael Lundahl for reporting this bug.</action>
<action action="add">Add missing PropertySetterException class to log4j-core.jar.
Thanks to ma.darche@free.fr for reporting this bug.</action>
</release>
<release version="1.1b4" date="2001-04-20">
<action>Mathias Bogaert observed that in version 1.1b3 the search algorithm
for the resource used in automatic log4j configuration was
different than in 1.0.x. Beta4 uses a more powerful mechanism which
is also compatible with 1.0.x.</action>
<action>Paul Glezen correctly observed that if log4j is deployed in a
client/server mode where multiple log4j clients log to a log4j
server, all hosts must be upgraded to version 1.1 in one go because
the internal LoggingEvent class used in client/server communication
changed in log4j 1.1.</action>
</release>
<release version="1.1b3" date="2001-04-18">
<action action="add">Add a RollingFileAppenderBeanInfo class that fakes the
maxFileSize JavaBeans property as a String type instead of a long.
This allows us to resuscitate setMaxFileSize(long) method that was
removed in 1.1b2 breaking 100% backward compatibility. This addition
restores 100% backward compatibility.</action>
</release>
<release version="1.1b2" date="2001-04-18">
<action>The directory structure has changed to better suit Jakarta
conventions</action>
<action action="add">Add a few jar files required at build time to build/lib so that
it is now possible to compile log4j out of the box.</action>
<action>Whenever a priority parameter is expected in a configuration file,
one can now use a custom priority class. See OptionConverter.toPriority
method for more information. Note that the &lt;priority> element in
log4j.dtd remains unaffected by this change.</action>
<action action="add">Add the setQuietMode(boolean) method to LogLog. In quiet mode
LogLog will not output anything even in case of errors.</action>
<action>Log4j components are now configured as JavaBeans. The setOption and
getOptionString methods have been deprecated in OptionHandler
interface which is implemented by most log4j components.</action>
<action>The stack trace of a throwable passed in a logging statement is not
parsed into a stack array which is serializable. This allows cascading of
log4j servers to properly propagate throwable information.</action>
<action>In XML configuration files, the &lt;configuration&gt; element has been
deprecated and was replaced by the &lt;log4j:configuration&gt; element.</action>
<action>The "log4j.configDebug" system property has been replaced with the
"log4j.debug" system property although it is still available.
Similarly, the "configDebug" attribute has been deprecated and
replaced with the "debug" attribute in log4j.dtd.</action>
</release>
<release version="1.1b1" date="2001-02-23">
<action>Logging can now be disabled per Hierarchy. It can also be disabled
using configuration files using the "disable" directive. The
"disableOverride" directive takes precedence over the "disable"
directive. As a result of this change the disable family of
methods in BasicConfigurator has been deprecated and replaced by the same
family of methods in the Hierarchy class.</action>
<action>The FileAppender has been split into three parts: WriterAppender,
ConsoleAppender and FileAppender. ConsoleAppender takes over the
console logging functionality of FileAppender. As a result support
for stream and console printing has been deprecated in FileAppender.</action>
<action>The FileAppender now correctly outputs the header and footer of its
layout. This problem was reported by too many users to list here.</action>
<action>Appenders and Layouts now get to see the raw message object in
LoggingEvent not just its rendered form. The access modifiers of
some LoggingEvent fields were changed so that they can be accessed
in less error-prone ways. Thanks to Jim Cakalic and Anders Kristens
for their valuable advice.</action>
<action action="add">Add getLayout(), getErrorHandler(), and getFilter() to the
Appender interface.</action>
<action action="add">Add getOption(key) method to the OptionHandler interface and modified
implementations of it as appropriate.</action>
<action action="add">Add the much awaited DailyRollingFileAppender.</action>
<action>The structure of the distribution changed somewhat. The log4j.jar
files can be found under dist/. The javadoc directory has been
moved to docs/api/. We are now totally dependent on ANT to perform
all the steps involved in creating a release, including
compilation, jar file creation, generation of the javadocs, and for
the creation of the distribution tar and zip files.</action>
<action>Removed org/apache/log4j/varia/ResilientFileAppender.java which was
bogus to begin with.</action>
<action>XMLLayout will now mark some output as &lt;![CDATA[ .. ]]&gt; so that it
does not get interpreted by the XML parser. This was suggested by
Mathias Bogaert like a long list of other fixes.</action>
<action>Corrected a bug in CyclicBuffer.resize method that would not update the
next insertion point. Thanks to Ole Bulbuk for accurately reporting
the bug.</action>
<action>The LoggingEvent class now supports serialization of priorities
derived from the org.apache.log4j.Priority class.</action>
<action>Improved the search method for finding the "log4j.properties" file in
the static initializer of Category class. Thanks to Calvin Chan for
supplying a better method.</action>
<action>The code handling the FCQN (formerly instanceFQN) parameter was
cleaned up. There is now a well-established and simple manner for
sub-classes of Category (or wrapper classes) to define the FCQN
variable: just define a static variable, say FCQN, consisting of
the fully qualified class name of the subclass or wrapper, supply
this variable as an argument to forcedLog method if and when
the sub-class or wrapper invokes that method.</action>
<action>Made the instanceFCQN an instance variable instead of a class
static in Category.java. In related move, the Category constructor
now takes an additional argument setting the instanceFCQN. This
makes life less miserable for Category subclasses.</action>
<action>Corrected a bug in the OptionConverter.instantiateByClassName
method that would not return the defaultValue in case of error. Thanks
to Matthieu Verbert for identifying this bug.</action>
<action>Corrected the missing stack trace in e-mails generated by the
SMTPAppender when using certain Layouts.</action>
<action>Updated the "Adding Conversion Characters to PatternLayout"
document to reflect the latest changes to the code. Also added the
org/apache/log4j/examples/appserver directory containing the
associated example code.</action>
<action action="add">Add the BufferSize option to the AsyncAppender.</action>
<action>Eliminated the SecurityExceptions thrown in Applets. Thanks Timur
Zambalayev for reporting this bug.</action>
<action>Fixed the erroneously thrown IOInterruptedException when the AsyncAppender
was closed. Thanks to Tom Palmer for accurately reporting this bug.</action>
</release>
<release version="1.0.4" date="2001-01-12">
<action>Corrected a serious bug in Hierarchy.java that would cause a
NullPointerException depending on the order of instantiation of
categories. Thanks to Wolfram Gewohn for reporting this bug.</action>
<action>Corrected a bug in the getOptionsStrings method of SMTPAppender
that omitted to mention the EvaluatorClass option. Thanks to Mark
Balster for reporting this bug.</action>
</release>
<release version="1.0.3" date="2001-01-11">
<action>Fixed a NullPointerException occurring in AsyncAppender after
invoking Category.shutdown. Thanks to Frank-Olaf Lohmann for
reporting this bug.</action>
<action>Modified the OptionConverter.selectAndConfigure method to take an
extra argument of type Hierarchy. This method is used internally
and should not affect most users.</action>
<action action="add">Add the warn method to LogLog which is used internally by log4j
to report on itself.</action>
<action>Displaced a number of HTML files under the docs directory. The new
structure is compatible with the jakarta site and results in a
more consistent navigation experience.</action>
<action>Made a few improvements in the javadocs.</action>
</release>
<release version="1.0.2" date="2001-01-11">
<action action="add">Add the missing build.inc file to the distribution. No code
changed.</action>
</release>
<release version="1.0.1" date="2001-01-10">
<action>This version corrects some documentation and build script bugs;
code has not changed.</action>
</release>
<release version="1.0" date="2001-01-08">
<action>Package hierarchy now starts at org.apache.log4j.</action>
<action action="add">Add the fatal() family of methods to the Category
class. Moreover, the EMERG priority has been removed from the
Priority class. This priority has been replaced by the FATAL
priority that is more widely accepted. This change will
require EMERG log statements to be replaced by FATAL log
statements. Assuming EMERG log statements are rare, this should
have a small but bearable impact on existing client code.
Moreover, the Unix Syslog priorities ALERT, CRIT and NOTICE are no
longer recognized. Support for these priorities was minimal and
few users should suffer from these changes.</action>
<action>Removed the methods setRootPriority, getRootPriority as these
methods were redundant and had been previously deprecated.</action>
<action>Removed the DOM Level 2 dependency in DOMConfigurator. This makes
log4j XML configurable using Sun's parser or Apache's Xerces.</action>
<action>The static initializer of the Category class now takes the
log4j.configuration system property to search for its configuration
file. The type of the configurator used to parse the configuration
file depends on the value of the log4j.configuration system
property.</action>
<action>Enhanced the PropertyConfigurator and DOMConfigurator to support
customisation of independent Hierarchy instances. The
org.apache.log4j.net.SocketServer has been enhanced to take
advantage of this functionality. The old code of SocketServer has
been moved to SimpleSocketServer.</action>
<action>Enhanced the PropertyConfigurator to support variable substitution
for all options *values* (but not keys!).</action>
<action>Categories are now aware of the Hierarchy they are linked to. This
will provide a basis for several performance enhancements planned
for the future.</action>
<action action="add">Add support for object rendering. It is now possible to register
an object renderer for a given object type. When the given object
needs to be logged log4j will invoke the corresponding renderer to
transform the object into a String.
As a result of this enhancement, all the String forms of all the
printing methods such as debug(String), info(String) have been
removed as they are no longer necessary. This change should be
backward compatible but requires recompilation of old client
code. Thanks to Michael Smith for noting the recompilation
requirement.</action>
<action action="add">Add support for user defined category factories in the
PropertyConfigurator. Thus, it is now possible to configure log4j
with a properties file and still use custom Category
sub-classes. The DOMConfigurator had already a finer grain
support.</action>
<action action="add">Add the SMTPAppender that in case of an error or fatal event
sends an e-mail containing latest N logging events in its buffer,
where N is chosen by the user.</action>
<action action="add">Add the method getInstance(Class) to the Category class.</action>
<action>Corrected a bug in configureAndWatch method of configurators that
would configure log4j only after an unnecessary delay.</action>
</release>
<release version="0.9.1" date="2000-11-30" description="the 19th public release">
<action>Corrected a typo making NTEventLogAppender.dll register the wrong
category message file. Thanks to Peter Hayes for accurately
reporting this bug.</action>
<action>The DOMConfigurator and PropertyConfigurator can now automatically
detect modified configuration files and re-read them.</action>
<action action="add">Add AsyncAppender which buffers log requests and serves them
at a later time. AsyncAppender can increase logging performance
tremendously if logging operations are interspersed with long
and blocking non CPU-intensive operations, typically I/O or network
access. For CPU intensive applications, using the AsyncAppender
will actualy degrade logging performance by 10 to 25 percent.</action>
<action>The log4j.dtd has been modified to allow appenders to refer to
other appenders by IDREF.</action>
<action>The DOMConfigurator has been modified to take advantage of ID/IDREF
attributes when referring to appenders. This change requires a
DOM Level-2 API compliant parser. DOM Level-2 java bindings are
available at
http://www.w3.org/TR/1999/WD-DOM-Level-2-19990923/java-binding.html.</action>
<action action="add">Add the configure(String filename) method to DOMConfigurator.
This method requires the presence of a JAXP compatible parser.
At this time, the only DOM2 and JAXP compatible parser seems to be
the Apache xerces parser.</action>
<action action="add">Add the PriorityMatchFilter allowing filtering by exact priority
match. This was a common request by users.</action>
<action>The configuration of a category is now an atomic operation. This
ensures that log requests are not lost while configuration is in
progress. Anders Kristensen was to first to observe the potential
problems in non-atomic configurations.</action>
</release>
<release version="0.9.0" date="2000-11-20" description="the 18th public release">
<action>The "log4j" element has been renamed to "configuration" in the
log4j DTD. This change requires that log4j configuration files
written in XML be modified. Since the log4j element figures only
once in the XML file, this change should take little time.</action>
<action>ResourceBundles are now category instance specific and no longer
class static. Moreover, like other properties resource bundles
are inherited from the category hierarchy.</action>
<action>The jar files log4j.jar and log4j-full.jar now contain versioning
information in their respective manifest files.</action>
<action>Corrected an inconsistency in the NTEventLogAppender which broke it.</action>
<action>Fixed a bug where configuration files were not parsed correctely
due to trailing spaces in option values as returned by
java.util.Properties. Trailing spaces are now removed from option
values. This bug was quite disconcerting because the
trailing spaces cannot be seen without careful examination of the
configuration file.</action>
<action action="add">Add the XMLLayout.
The output of the XMLLayout consists of a series of log4j:event
elements. It does not output a complete XML file. The output is designed to
be included as an external entity to form a well-formed XML file.</action>
<action action="add">Add a new abstract class org.log4j.helpers.DateLayout. The TTCCLayout
now extends DateLayout.</action>
<action>Corrected a rather subtle performance bug in the buffer management code
in PatternLayout. Thanks to Vladislav Dutov and Constantine
A. Plotnikov for for insisting on the correction of this bug.</action>
<action>Created a new package called org.log4j.spi. This new package
holds classes that are hidden from the casual user but are needed
to extend log4j.</action>
<action action="add">Add org.log4j.varia.ExternallyRolledFileAppender to handle
externally triggered file rollovers.</action>
<action action="add">Add support for multiple hierarchy trees.</action>
<action>PatternLayout can now be subclassed to support new conversion
patterns.</action>
<action>Extended the DOMConfigurator and the log4j DTD to properly handle
sub-classing of Category and Priority classes.
There have been also minor adjustments to other classes to handle
sub-classing. These changes should be invisible to users.
All categories except the root category can be sub-classed and also
assigned priorities sub-classing org.log4j.Priority.
The root category always exists and CANNOT be subclassed.
The ProppertyConfigurator remains unchanged. Thus, it does not
handle extensions of the Category class.</action>
<action action="add">Add filter support in appenders. The DOMConfigurator and the
log4j.dtd have been enhanced to support filters.</action>
<action action="add">Add error handling support to appenders. The DOMConfigurator and the
log4j.dtd have been enhanced to support filters.</action>
<action action="add">Add support for correct interpretation of location information in
IBM's Visual Age environment. Thanks to Wolf Siberski for supplying
the relevant patch.</action>
<action action="add">Add getAdditivity method to Category. This feature was requested
by Constantin Mitran. (mitran at ecircle.de)</action>
</release>
<release version="0.8.5b" date="2000-08-27">
<action>Corrected multiple bugs in default initialization code of
Category class. Thanks to Jeff Turner for identifying and supplying
corrective patches.</action>
</release>
<release version="0.8.5a" date="2000-08-24">
<action action="add">Add the %n conversion character to PatternLayout so that a line
separator can be specified in a platform independent way.</action>
<action>In 0.8.5 internal Priority integer values were decoupled from the
Unix Syslog values. This broke SyslogAppedder. A new function
Priority.toSyslogInt is introduced to solve this bug.</action>
<action>Corrected a bug where the internal priority integer</action>
</release>
<release version="0.8.5." date="2000-08-23">
<action>All log4j internal output is now prepended with the string
"log4j: ". This makes is easier to differentiate log4j internal
logs from messages output by other sources.</action>
<action>Sub-classes of Category class must now specify their fully
qualified name when constructing logging events. This allows the %C
conversion specifier in PatternLayout to work properly even with
sub-classes or wrappers of Category.</action>
<action action="add">Add the method disableDebug to BasicConfigurator. This method
disables all print requests of debug priority regardless its
category. Similar methods disableInfo, disable, disableAll and
enableAll have also been added. Disable type methods can be
overriden by setting the log4j.disableOverride system property.
Calling BasicConfigurator.disableInfo is equivalent to the now
deprecated flagAsShippedCode method.</action>
<action>Given the above changes, the system property
log4j.shippedCodeFlagOverride is no longer honored.</action>
<action>It is now possible to sub-class Category. The sub-classes may
continue to adhere to the category hierarchy. This was a frequently
requested feature.</action>
<action>Corrected a problem with the additivity flag being ignored in
categories without appenders. This bug was discovered by Anders
Kristensen.</action>
<action action="add">Add a method BasicConfigurator.resetConfiguration to reset the
log4j environment. This method should be used sparingly.</action>
<action>At the initialization of the Category class, the file
log4j.properties will now be searched from the search path used to
load classes. If the file can be found, then it is fed to the
PropertyConfigurator.configure(java.net.URL) method.</action>
<action>Failing to access system properties within the static initializer
of BasicConfigurator class is no longer reported as an error but as
a debug message. Thanks to Gilles Schlienger for reporting this
problem with applets.</action>
<action>Corrected a bug which caused infinite loops when using conversion
patterns with a single element, fortunately under very rare
circumstances. This bug was first reported by Igor Potraev, the
author of log4p. It was independently reported by Joe Haberl from
IBM Global Services.</action>
<action action="add">Add a mechanism to lazily remove references to dead threads in
the NDC class. Indeed, in previous versions calling NDC.pop within
a thread but forgetting to call to NDC.remove before exiting (that
thread) resulted in a memory leak.</action>
<action>Corrected a huge memory leak in SocketAppender. This leak was due
to the ObjectOutputStream indefinitely holding a reference for each
written to the stream. Thanks to Dan MacDonald for very accurately
describing this bug.</action>
<action>The log and l7dlog methods in Category no longer ignore the shipped
code flag. This bug was reported by Mario Schomburg.</action>
<action action="add">Add missing NDC information to LoggingEvent.writeObject
method.</action>
<action>Corrected handling of SocketException in SocketNode. Thanks to
Gerald Gutierez (ggutierez@emobiledata.com) for reporting this and
the previous problem.</action>
<action>Phased out custom shell scripts to build java documentation and jar
files in favor of Jakarta's ANT. It was becoming a nuisance to keep
the ANT build file in sync with the custom shell scripts.</action>
</release>
<release version="0.8.4d" date="2000-05-11">
<action>The NT EventViewer no longer complains about missing message 4096.</action>
<action>Minor corrections in documentation.</action>
<action action="add">Add missing icons GIFs into the distribution.</action>
<action>SocketNode now attempts to close the socket when exiting. Thanks to
Moses Hohman (mmhohman@rainbow.uchicago.edu) for noting this.</action>
<action>Removed the com.ibm.log4j from the javadoc directory. This seems to
confuse VAJ. Thanks to Steve Ashcroft for reporting this problem.</action>
</release>
<release version="0.8.4c" date="2000-05-05">
<action>As a result of the infinite loop problem (see next item), added
over 800 new test cases to stress-test the code in CategoryFactory
class where category creation occurs.</action>
<action>Under certain rare circumstances the Category.getInstance method
entered an infinite loop. Thanks to Mario Schomburg from IBM Global
Services / Hannover for identifying this problem and proposing a
patch.</action>
<action>DOMConfigurator and the log4j.dtd were out of sync on the type of
the priority directive. As a result, priority directives all
defaulted to DEBUG. Thanks to Peter (petervt@users.sourceforge.net)
for accurately reporting this bug.</action>
<action>Minor additions to the FAQ.</action>
<action action="add">Add the NumberCruncher example showing how the NDC class can be
used to distinguish output from different clients.</action>
<action action="add">Add the %x conversion specifier to the TTCC_CONVERSION_PATTERN in
the PatternLayout class. This is consistent expected output of
Trivial.java example. Thanks to Jerome (schrom@users.sourceforge.net)
for reporting this bug.</action>
</release>
<release version="0.8.4b" date="2000-05-03">
<action>The value of the additivity option would not be parsed properly by
the ProperytConfigurator if the line containing the option
contained trailing spaces.</action>
</release>
<release version="0.8.4a" date="2000-05-03">
<action>The localized logging methods (l7dlog) omitted priority based
evaluation and erroneously logged all requests. </action>
</release>
<release version="0.8.4" date="2000-05-01">
<action>The close method was added to the Appender interface allowing
appender implementations to release any resources they may have
allocated.</action>
<action>The package naming scheme of changed from "com.ibm.log4j.*" to
"org.log4j.*". The new naming reflects the open source nature of
the project and is consistent with the URL http://www.log4j.org.</action>
<action action="add">Add internationalization support. See the newly introduced l7dlog
methods in Category class.</action>
<action>In the FileAppender, the File option now admits variable
substitution. For example, if "java.home" system property is set
to /home/xyz and the File option is given the value
"%{java.home}/test.log", then File option will be interpreted as
"/home/xyz/test.log".
Thanks to Avy Sharell (sharell@online.fr) for contributing this
feature.</action>
<action>SocketAppender is now officially part of the package. It is capable
of sending logging events to a remote SocketNode. The SocketNode
logs events according to server (local) policy. For example, a
client can log events to a local file and also send them to a
remote server (a SocketNode). This server can log the event to any
number of files, to the console, to any number of TextPaneAppenders
and even re-transmit the event to another server, and so forth.
This paradigm is common in most logging systems, e.g. Syslog and NT
Event Log. Many thanks to Andrew Harrison for showing a way to
actually implement the paradigm.</action>
<action>The Category.callAppenders method now accepts a LoggingEvent
instead of creating one itself. This was necessary to accommodate
events generated at a remote client.</action>
<action>LoggingEvent class changed slightly to support remote logging. The
category field (a Category) has been replaced by the categoryName
field (a String).</action>
</release>
<release version="0.8.3b" date="2000-04-14">
<action>Corrected a bug in Category.removeAppender(String) which would
never remove the desired appender. Thanks to Moses Hohman for
reporting this bug.</action>
</release>
<release version="0.8.3a" date="2000-04-14">
<action>Corrected a bug RollingFileAppender which would throw an uncaught
exception in case output file could not be opened for
writing. Thanks to Vinay Aggarwal for signaling this problem.</action>
</release>
<release version="0.8.3" date="2000-04-13">
<action>The log4j.override key defined in BasicConfigurator has been
renamed to log4j.shippedCodeFlagOverride.</action>
<action>The getCurrentCategories method in the Category class would not
return the correct value. Thanks to Timothy Potter
(tpotter@agency.com) for reporting this problem.</action>
<action>Appenders now admit a priority threshold as an option. All requests
with a priority lower than the appender's threshold priority are
ignored by the appender.</action>
<action>Integrated Christopher Taylor's DOMConfigurator parsing XML
configuration files.</action>
<action>The jar file log4j-net.jar has been replaced by log4j-full.jar. It
contains DOMConfigurator.class in addition to the com.ibm.log4j.net
package.</action>
<action action="add">Add support for the ANT build tool. Thanks to Christopher Taylor
for supplying the build.xml file. ANT is available form
http://jakarta.apache.org.</action>
<action>FileAppender's File option now accepts the values "System.out" or
"System.err". If one these values is suppiled in a configuration
file then the output is directed to the corresponding stream.
Moreover, the default constructor of FileAppender no longer sets
System.out as an output target nor does it define a default
layout.</action>
<action action="add">Add caller class (C), caller file name (F), caller line number
(L), caller method name (M) conversion specifiers to the
PatternLayout class.
The category conversion specifier now takes an optional precision
modifier allowing the user to control the number of right most
components in the category name that will be printed.
Corrected a bug occuring when the caller file name and line number
information were unavilable due to JIT compilation. In that case,
the PatternLayout would not properly use the rest of the available
location information.
The above enhancements and bug-fixes originate from comments by
Nelson Minar (nelson@monkey.org).</action>
</release>
<release version="0.8.2" date="2000-03-23">
<action>The SimpleLayout and TTCCLayout are replaced by the PatternLayout
in the log4j.jar file to keep its size small. These two layouts are
still part of the package.</action>
<action>The PatternLayout class is introduced. This new layout is
configurable using a conversion pattern which is parsed at
runtime. This allows the user to choose the output layout without
writing any code and only at a marginal performance cost compared
to the dedicated layouts such as SimpleLayout and TTCCLayout. The
PatternLayout also allows the user to determine minimum and maximum
field lengths.
The PatternLayout was written by Jim Cakalic
(jim_cakalic@na.biomerieux.com).</action>
<action>All internal components now use LoggingEvent instances to specifiy
logging information.</action>
<action>Corrected a problem with a missing variable initialization in
SyslogAppender. This caused NullPinterException to be thrown when
logging exceptions.
Added a default constructor to SyslogAppender. The lack of this
constructor caused PropertyConfigurator to throw a
java.lang.InstantiationException when the appender type was set to
be SyslogAppender.
Thanks to Yves Bossel (ybossel@opengets.cl) for accurately
identifying these bugs.
Modified some other related option handling code in
SyslogAppender.</action>
<action>Made NDC.get public access instead of default access. Thanks to
Y. J. Chun (monac@softonnet.com) for reporting this problem.</action>
<action>PropertyConfigurator now parses the additivity option for
categories.</action>
<action>Corrected the value of the ADDITIVITY_PREFIX constant to match the
documented value, that is "log4j.additivity".</action>
<action>Corrected a really bad bug where System.out would be closed when
PropertyConfigurator.configure was called. Thanks to Christopher
Taylor (cstaylor@pacbell.net) for tracking and reporting this bug.</action>
<action>The PropertyConfiguator now prints debug messages if the flag
"log4j.configDebug" is defined in the configuration
file. Previously, only if the system property "log4j.configDebug"
was set would debug messages be printed. A question by Shawn
Kircher (skircher@vninet.com) induced this change.</action>
<action>In AbsoluteTimeDateFormat, DateTimeDateFormat and ISO8601DateFormat
the separator between the seconds and milliseconds has been changed
to comma from full stop, in order to be compliant with ISO8601's
preferred sign. Thanks to Jim Cakalic
(jim_cakalic@na.biomerieux.com) for pointing out this discrepancy
with the standard.</action>
<action>Corrected a bug where RollingFileAppender would not work
properly on Windows systems. Thanks to Heinz Richter
(heinz.richter@ecmwf.int) for noting this problem.</action>
</release>
<release version="0.8.1" date="2000-02-19">
<action>Core classes are now independent of the format of the options
file. Configurable core classes implement the OptionHandler
interface. OptionHandlers allows configurators to learn the
relevant option names. The configurator feeds option values to the
OptionHandler which configures itself.
As a result of these changes, the Init class has been broken down
to two separate classes: the BasicConfigurator and the
PropertiesConfigurator.
An XML configurator for 0.8.0 has been already written by
Christopher Taylor (cstaylor@pacbell.net).</action>
<action action="add">Add multiple appender support per category. The appenders follow
the category hierarchy, i.e. a child category inherits the
appenders of its parents.</action>
<action action="add">Add an assert() method to the Category class. Steven Marcus
(srnm@awaretechnologies.com) requested this addition.</action>
<action>Automatic stack printing is no longer supported. This was an unused
and unreliable feature which unnecessarily complicated the
code.</action>
<action>log4j now emits a single warning message when no appender to write to
could be found. This is typically the case when the user forgets
to configure the log4j environment. This change was suggested by
Jim Cakalic (jim_cakalic@na.biomerieux.com).</action>
<action>RollingFileAppender adds file roll over capability-implemented by
Heinz Richter (heinz.richter@ecmwf.int).</action>
<action>Corrected a bug where a java.lang.NoClassDefFoundError would be
thrown because com.ibm.log4j.helpers.SyslogTracerPrintWriter was
not included in log4j.jar. Thanks to Jim Cakalic (jim_cakalic@na.biomerieux.com)
for signaling this bug.</action>
</release>
<release version="0.8.0" date="2000-02-09">
<action>There has been an important API changes. The Log, NOPLog and ILog
classes have been removed. Their functionality has been migrated to
the Category class.
In this release, instead of writing
ILog.debug(CAT, "Some message.");
one will write
CAT.debug("Some message.");
Arndt Schoenewald &lt;arndt@ibm23093i821.mc.schoenewald.de&gt; observed that
one could use the Category objects directly for logging.</action>
<action>It is no longer possible to instantiate Category objects directly.
Instead, one would use the factory method
Category.getInstance(String name). [***]
There category instantiation code was moved to CateogryFactory
class. This class has package visibility and remains hidden from
the user.
This stylistic improvement was suggested by Luke Blanshard
(luke@quiq.com).</action>
<action>The Init class offers methods to initialize the log4j
environment. The Init.flagAsShippedCode method replaces the NOPLog
class.</action>
<action>Changes in the documentation to reflect the API changes.</action>
<action>The NDC.cloneStack and inherit methods now tolerate null-stacks.</action>
</release>
<release version="0.7.5" date="2000-01-29">
<action>TTCCLayout now takes a java.text.DateFormat object as a
parameter. The task of formatting the date is delegated to this
object.
Added four classes extending the java.text.DateFormat class. These
are RelativeTimeDateFormat, AbsoluteTimeDateFormat,
DateTimeDateFormat and ISO8601DateFormat classes.
Thanks to Arndt Schoenewald &lt;arndt@ibm23093i821.mc.schoenewald.de&gt;
for suggesting the ISO8601 date format.
These four classes can be parametrized with a particular
TimeZone. The TTCCLayout class now accepts a new configuration file
option called "TimeZone".
These four DateFormats are less malleable than the
java.text.SimpleDateFormat but they are also much faster.
As a consequence of these changes, the setRelativeTime,
setDatePrinting methods in TTCCLayout have been removed along with
the associated configuration file options RelativeTime,
DatePrinting and TimePrinting.
The current code is inspired by code contributed by
Heinz Richter (heinz.richter@ecmwf.int).</action>
<action>The Log.emerg method has been deprecated. If you use statements of
EMERG priority, please use the Log.log form instead.</action>
<action action="add">Add getDepth and setMaxdepth methods to the NDC class. This makes
it easier to manage the nested context depth especially when
callees push but forget to pop.</action>
<action>Moved the documentation in com/ibm/log4j/package.html to
com/ibm/log4j/overview.html. Many users were failing to read the
com/ibm/log4j/package.html description due to the unfortunate
layout of the text. Hopefully more people will read the package
overview in its present location.</action>
<action action="add">Add the com.ibm.log4j.net package for doing remote logging using
TCP sockets. This is still experimental code.</action>
<action action="add">Add new debug, .., emerg methods that do not require a category
parameter. They assume the "root" category, that is the decision to
whether print or not is made by comparing the statement's priority
with the default priority. </action>
</release>
<release version="0.7.4" date="2000-01-21">
<action action="add">Add a new ILog.init method accepting an Appender and a
configuration file as parameters.</action>
<action>FileAppender's setWriter and setFile methods where not instantiating
a new tracer. This caused stack traces to be lost! SyslogAppender
had a similar problem.</action>
<action>The FileAppender and SyslogAppender where not calling the layout's
readConfig method to set layout specific options. Thanks to Heinz
Richter (heinz.richter@ecmwf.int) for reporting this bug.</action>
<action>Corrected a bug in Log.log() method where the appender was always
called with Priority.DEBUG. Thanks to Oliver Boehm
(Oliver.Boehm@abaxx.de) for reporting this bug.</action>
</release>
<release version="0.7.3" date="2000-01-14">
<action action="add">Add Syslog compatibility. One can now choose (at runtime) between
remote syslog logging or file logging.
Syslog logging performance, although not appalling, is significantly
slower than file logging.</action>
<action>Priority class was enriched with the previously missing priorities
NOTICE, ALERT and CRIT. The internal constants were also aligned with
the syslog counterparts.</action>
<action action="add">Add the Log.log method to support the new priorities.</action>
<action>TracerPrintWriter is now an independent class instead of being a
nested top-level class in Tracer.</action>
<action>A number of writers, namely the SyslogWriter, SyslogQuietWriter,
SyslogTracerPrintWriter, were added to the helper package.</action>
<action>Log.force method was removed. The various Appender.doAppend
implementations take over its functionality.</action>
<action>FileAppender and SyslogAppender now use QuietWriter. QuietWriter is
a FilterWriter which hides exceptions and instead emits a single
warning message to System.err.</action>
<action>The layout is now an initialization parameter to the appender
type. Previously, the layout and the appender where independent
parameters to the Log constructor.</action>
<action>Many small improvements and corrections in the documentation.
Syslog related documentation remains sparse.</action>
<action>ILog.init() and ILog.init(String configFile) have been changed to
call ILog.init(,,,) with "com.ibm.log4j.Log.class" as the first
parameter. This makes it easier for people to get familiar with log4j.</action>
<action action="add">Add missing files to the make directory. These files are useful
for those wishing to use the log4j make environment. Thanks to "Lee
Hall" &lt;LHall@JavaFoundry.com&gt; for reporting this omission.
Until recently the make environment failed to compile RMI stubs in
a single run. This nagging problem has been corrected thanks to
help from Thomas Eirich (IBM Zurich Research Lab).</action>
</release>
<release version="0.7.2" date="2000-01-04">
<action>Some users have been rightly complaining about the verbosity
TTCCLayout's date output. The full date output is now shortened to
"dd MMM YYYY HH:mm:ss.SSS" for example, "06 Nov 1994 08:49:37.459"
In addition, users may now choose to print only time information,
as in "08:49:37.459".</action>
<action>The package now uses Writer instead of OutputStream as its output
target. This makes the log4j code smaller and easier to
understand at the cost of a slight performance degradation. As a
result of this change a few method names in FileAppender class were
changed.</action>
<action>Preliminary experiments with SyslogAppedner and SyslogLayout show
that syslog compatibility is not far away. The difficultly is
adding syslog compatibility without making radical changes to the
current log4j architecture.</action>
<action>Corrected a bug in the NOPLog.createInstance method which always
created a Log singleton even if the system property "log4j.logType"
was set to NOPLog. Thanks to Robert Gottofrey
(Robert.Gottofrey@wdr.com) for reporting this bug and the
associated test case.</action>
<action>Removed the inconsistent "Layout" configuration option in
Log.readConfig(). This change should be transparent to most
users.</action>
</release>
<release version="0.7.1" date="1999-12-20">
<action>The LogCreationManager class has been removed. Its functionality
has been transfered to the createInstance and getInstance methods
in the Log and NOPLog classes. The new way of creating instances is
both simpler and less error prone although just as flexible.
As a result of these changes, the init family of methods in the
ILog class have been adjusted to the new way of creating the log
singleton.</action>
<action>The Appender interface has been introduced. The method of writing a
log statement into an output stream can now be varied by using a
different Appender. The new FileAppender offers the same
functionality that was previously part of the Log class.</action>
<action>Changed the time format used in TTCCLayout to be of the form "Day,
dd MMM YYYY HH:mm:ss.SSS GMT" for example, "Sun, 06 Nov 1994
22:49:37.459 GMT". This format is almost the same as the format
specified in RFC 1123 and also the format recommended in RFC
2616. The only difference is the additional milliseconds
information.</action>
<action>The layout specific options were not read from the configuration
file due to a missing instruction. Many thanks to Vikram Sridharan
(Vikram.Sridharan@alysis.com) to patiently pointing out this
omission to an unbelieving maintainer.</action>
</release>
<release version="0.7.0" date="1999-12-16">
<action>Version 0.7.0 and above will be distributed under the IBM Public
License (IPL). The IPL is an approved open source license (see
http://www.opensource.org/licenses/ for a list). It grants similar
rights to the previous ALPHAWORKS license agreement, in particular,
the right to redistribute and to modify the package.</action>
<action>The Log class can now be parameterized with a Layout object.
Layouts determine the format of what is printed, where as the Log
class decides when to print and to where.
As a result of this modularization, the CGULog and NOPCGULog
classes no longer exists. CGULog class has been replaced with the
TTCCLayout (Time Thread Context Category). This should make it
easier to create new log output formats.
Some time in the near future, the Log class will be further broken
down to allow different strategies for writing to output streams.</action>
<action>Renamed com.ibm.util.log hierarchy to to com.ibm.log4j. I wanted to
do this for some time. I feel release 0.7.0 was the last
opportunity to do so. I am sorry for the the trouble caused by this
change.</action>
<action>New NDC class. This class implements nested diagnostic contexts as
suggested by Neil Harrison in the article "Patterns for Logging
Diagnostic Messages" part of the book "Pattern Languages of Program
Design 3" edited by Martin et al. Nested diagnostic contexts is a
nifty feature that was missing up to now.
The StressNDC test class seems to break JDK 1.2.2 beta on AIX. On
Linux and NT using sun's JDK 1.2.2 it seem to work OK. In any case,
tests done with StressNDC and associated perl script seem to
indicate that the NDC class is bug-free.</action>
<action>Corrected a date formatting bug in CGULog class where on some
environments the wrong month was printed. Thanks to Christopher
Williams (Christopher_Williams@mail.northgrum.com) for signaling
this bug. Also changed the month format from a number to a three
letter abbreviation such as "Jan", "Feb", ..., "Dec". The new
format is unambiguous regardless of local date format.</action>
</release>
<release version="0.6.2" date="1999-12-08">
<action>Clearer documentation with still much room for improvement.</action>
<action>Corrected a bug in the Tracer class which always used the Unix line
separator instead of the system specific separator. Thanks to
Vikram Sridharan (Vikram.Sridharan@alysis.com) for singaling this
bug.</action>
<action>Corrected a runaway comment which gulped the CGULog.readConfig
method.</action>
<action action="add">Add the init family of methods to the ILog class to ease the
setup of a basic logging environment. Thanks to Mark Donszelmann
(Mark.Donszelmann@cern.ch) for this enhancement.</action>
<action>Just an hour after releasing version 0.6.1 detected and corrected a
bug where the Tracer class would correctly print Exception stack
trace but not the type of the Exception. Replaced the
distribution on www.zurich.ibm.com without changing the version
number. I hope nobody is using the intermediary (and buggy) release
of 0.6.1.</action>
</release>
<release version="0.6.1" date="1999-11-16">
<action>Better documentation with still much room for improvement.</action>
<action>For consistence sake, added setDefaultPriority and
getDefaultPriority methods to the Category class and deprecated
setDefaultPriority in the Log.class.</action>
<action>Corrected a major bug where if two categories were homonyms the
second instance would not be properly initialized.</action>
<action>Increased the speed of Exception logging from about 4000
microseconds to about 1000. It seems that for some people Exception
logging is performance critical. Improved implementation is a
variant of Nocolai's (XNH@crisplant.com) implementation.</action>
</release>
<release version="0.6.0" date="1999-11-09">
<action>Release of log4j 0.6.0 with incomplete documentation.</action>
<action action="add">Add a stress test program to debug the new Category class. It
turns out that the test program was as hard to get right as the
Category class. Given the favorable results of the stress test I am
quite confident that the new class is now bug free. This assumption
has been proven to be wrong. See above.</action>
<action>Created a new class called Category to manipulate categories
instead of plain Strings. The new class is just as easy to use.
However, the evaluation of whether to log or not to log is at least
10 times faster. The NOP class performance remain unaffected by the
change. (You can't improve on the performance of an empty function
call.)
Many thanks to Alex Blewitt "Alex.Blewitt@ioshq.com" for his
valuable comments. He was the first to observe that finding Strings
in a hash table was an expensive operation.
This change will require some recoding on your part. See the FAQ
for more details.</action>
<action>Modified the force in Log and CGULog method to use a byte[] buffer
instead of a StringBuffer. The old code was clearer but the new one
is at least 25% faster.</action>
<action action="add">Add regression testing.</action>
<action>We now enforce a policy where the OutputStream set by
setOutputStream is a user managed resource whereas the OutputStream
opened using setLogFile is the Log class' responsibility.
The setLogFile method now closes any previous OutputStream if only
if opened through setLogFile. If the previous OutputStream was
opened by the user and set through setOutputStream the previous
OutputStream is untouched.
Similarly, setOutputStream will close any previous OutputStream if
and only if it was opened using setLogFile.
</action>
<action action="add">Add a new method logOutputStreamExists to the Log class allowing
the programmer to check if there is already an opened stream before
trying to set a new one. A stream can be opened as a byproduct of
reading the configuration file.</action>
<action>Changed the behavior of the (private) Log.Append method in case of
failure to write to the OutputStream.
Previously, in case of failure, we reverted to System.err. Now, we
emit a warning message and discard all future log messages. The
new behavior is consistent with our current unreliable logging
semantics. The change prevents an otherwise functional program
from failing because the terminal is flooded with logging messages.</action>
<action>Renamed the iLog to ILog to remain consistent with our class naming
scheme. The initial intention was to add ILog and deprecate
iLog. However, I am running CVS on a fat16 partition, causing
serious problems when files differ only in case.</action>
<action>Corrected a bug where the LogFileName was not remembered. Thanks to
Jens for signaling this bug.</action>
</release>
<release version="0.5a" date="1999-10-28">
<action>Now the programmer can choose to truncate the log file instead of
always appending to it. This functionality was first requested and
intially implemented by "Jens Uwe Pipka" jens.pipka@gmx.de.</action>
<action>setLogFile now opens the requested file instead of having the
Append function open it later. Cleaned up some related code in the
Append function. Although nobody has requested it, there is still
no method to close the log file. This is harder to implement
reliably than it sounds.</action>
<action>Simplified setLogOutputStream so that it does no longer return the
previously set OutputStream.</action>
</release>
<release version="0.5" date="1999-10-27">
<action>Joe Walker (joe@eireneh.com) observed that the
LogCreationManager.getSingleton mechanism was cumbersome. There is
now a new class iLog (indirect Log) which hides the need to call
getSingleton. Performance testing on my 233Mhz Thinkpad shows that
this indirection has small performance impact on non-logged calls
in the order of 40 nanoseconds. The impact on logged calls is
negligible.</action>
<action action="add">Add a jar file to the distribution. The jar file contains only
the files you would need to use log but not other classes needed
for testing nor examples.</action>
<action>Corrected a bug where CGUNOPLog was not integrated to the Makefile.</action>
<action action="add">Add new public methods isDebugEnabled and isInfoEnabled to allow
programmers to check whether a debug/info statement will be logged
without incurring the cost of message parameter construction. This
addition was suggested by Luke Blanshard Luke@quiq.com.</action>
<action>Renamed the private method evaluate to isEnabled. Also made it
final with no apparent speed gains. In addition, made the
Log.force method public.</action>
<action>New syntactic sugar debug, ..., emerg, methods to log objects.</action>
<action>Modified the interface to deal with Throwables and not just
Exceptions. My thanks to Luke Blanshard for signaling this "bug".</action>
<action action="add">Add more tests to the LogPerformance class. In particular, to
test the influence of indirect debug calls.</action>
<action action="add">Add a "make" mini-tutorial for those who want to modify the code.</action>
<action>License updated to standard alphaWorks license allowing
modifications to source code. However, this license explicitly
requires that modifications be communicated back to alphaWorks.</action>
</release>
<release date="1999-10-15">
<action>Initial availability on alphaWorks. Refer to the FAQ for the lineage of the package.</action>
</release>
</body>
</document>
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