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<div class="sect1">
<h2 id="release-notes-2-1">2.1</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">Release date</dt>
<dd>
<p>2014-10-19</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>This is the fourth GA release which contains several bugfixes and new features.
There are two new Maven artifacts in this release: <code>log4j-jul</code> and <code>log4j-iostreams</code>.
Both components are API-based with optional Core features.</p>
</div>
<div class="paragraph">
<p>Apache Log4j 2.1 requires a minimum of Java 6 to build and run.
Basic compatibility with Log4j 1.x is provided through the <code>log4j-1.2-api</code> component, however it does
not implement some of the very implementation specific classes and methods.
The package names and Maven <code>groupId</code> have been changed to <code>org.apache.logging.log4j</code> to avoid any conflicts with Log4j 1.x.</p>
</div>
<div class="paragraph">
<p>For complete information on Apache Log4j 2, including instructions on how to submit bug reports, patches, or suggestions for improvement, see <a href="http://logging.apache.org/log4j/2.x/">the Apache Log4j 2 website</a>.</p>
</div>
<div class="sect2">
<h3 id="release-notes-2-1-added">Added</h3>
<div class="ulist">
<ul>
<li>
<p>Implement a GELF layout. (<a href="https://issues.apache.org/jira/browse/LOG4J2-428">LOG4J2-428</a>)</p>
</li>
<li>
<p>Added Memory-Mapped File Appender. (<a href="https://issues.apache.org/jira/browse/LOG4J2-431">LOG4J2-431</a>)</p>
</li>
<li>
<p>Add the Log4j IOStreams component. (<a href="https://issues.apache.org/jira/browse/LOG4J2-547">LOG4J2-547</a>)</p>
</li>
<li>
<p>Supported filtering on custom log levels in configuration. (<a href="https://issues.apache.org/jira/browse/LOG4J2-589">LOG4J2-589</a>)</p>
</li>
<li>
<p>Add java.util.logging implementation based on log4j-api. See log4j-jul documentation for more details. (<a href="https://issues.apache.org/jira/browse/LOG4J2-608">LOG4J2-608</a>)</p>
</li>
<li>
<p>Add lookup for application main arguments. (<a href="https://issues.apache.org/jira/browse/LOG4J2-771">LOG4J2-771</a>)</p>
</li>
<li>
<p>Add lookup for JVM arguments. (<a href="https://issues.apache.org/jira/browse/LOG4J2-787">LOG4J2-787</a>)</p>
</li>
<li>
<p>Add support for custom SLF4J Markers in log4j-slf4j-impl module. (<a href="https://issues.apache.org/jira/browse/LOG4J2-793">LOG4J2-793</a>)</p>
</li>
<li>
<p>Move reflection utility class to API&#8217;s private utility classes. (<a href="https://issues.apache.org/jira/browse/LOG4J2-809">LOG4J2-809</a>)</p>
</li>
<li>
<p>Documentation: added section on XInclude to user manual Configuration page. (<a href="https://issues.apache.org/jira/browse/LOG4J2-816">LOG4J2-816</a>)</p>
</li>
<li>
<p>Add simple validation constraint annotations for the Plugin system. (<a href="https://issues.apache.org/jira/browse/LOG4J2-825">LOG4J2-825</a>)</p>
</li>
<li>
<p>Support use of TypeConverter classes through the standard Plugin system. (<a href="https://issues.apache.org/jira/browse/LOG4J2-827">LOG4J2-827</a>)</p>
</li>
<li>
<p>Documentation: added Runtime Dependencies link to left nav-bar on site. (<a href="https://issues.apache.org/jira/browse/LOG4J2-833">LOG4J2-833</a>)</p>
</li>
<li>
<p>Add a Java lookup to provide nicely formatted runtime version information. (<a href="https://issues.apache.org/jira/browse/LOG4J2-848">LOG4J2-848</a>)</p>
</li>
<li>
<p>Documentation: add sections on the JUL Adapter, IO Streams and NoSQL Appenders to the Maven and Ivy page. (<a href="https://issues.apache.org/jira/browse/LOG4J2-856">LOG4J2-856</a>)</p>
</li>
<li>
<p>Add ShutdownCallbackRegistry interface for customizable shutdown callback handling. This is particularly useful for application servers that wish to integrate with Log4j 2. (<a href="https://issues.apache.org/jira/browse/LOG4J2-868">LOG4J2-868</a>)</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="release-notes-2-1-changed">Changed</h3>
<div class="ulist">
<ul>
<li>
<p>Incomplete documentation for JSONLayout. (<a href="https://issues.apache.org/jira/browse/LOG4J2-766">LOG4J2-766</a>)</p>
</li>
<li>
<p>Update Spring Framework to 3.2.11.RELEASE from 3.2.8.RELEASE. (<a href="https://issues.apache.org/jira/browse/LOG4J2-780">LOG4J2-780</a>)</p>
</li>
<li>
<p>Update Jackson to 2.4.2 from 2.4.1 (for XML and JSON processing). (<a href="https://issues.apache.org/jira/browse/LOG4J2-790">LOG4J2-790</a>)</p>
</li>
<li>
<p>All life cycle implementations should be serializable. This is still work in progress. (<a href="https://issues.apache.org/jira/browse/LOG4J2-800">LOG4J2-800</a>)</p>
</li>
<li>
<p>org.apache.logging.log4j.core.Logger should be serializable. This is still work in progress. (<a href="https://issues.apache.org/jira/browse/LOG4J2-801">LOG4J2-801</a>)</p>
</li>
<li>
<p>Update javax.mail to 1.5.2 from 1.5.0. (<a href="https://issues.apache.org/jira/browse/LOG4J2-810">LOG4J2-810</a>)</p>
</li>
<li>
<p>Unify the two JMS appenders into a single appender. Configurations written for 2.0 will still work in 2.1+. (<a href="https://issues.apache.org/jira/browse/LOG4J2-815">LOG4J2-815</a>)</p>
</li>
<li>
<p>Update org.eclipse.persistence.jpa to 2.5.2 from 2.5.1. (<a href="https://issues.apache.org/jira/browse/LOG4J2-822">LOG4J2-822</a>)</p>
</li>
<li>
<p>Documentation: updated FAQ "which jars" diagrams for JUL bridge and 2.1 version. (<a href="https://issues.apache.org/jira/browse/LOG4J2-831">LOG4J2-831</a>)</p>
</li>
<li>
<p>Update JMH to 1.1 from 0.7.2. (<a href="https://issues.apache.org/jira/browse/LOG4J2-844">LOG4J2-844</a>)</p>
</li>
<li>
<p>Add 2.1.0 to compatible versions in Log4j API ProviderUtil and update Log4jAPIVersion to 2.1.0 in core META-INF/log4j-provider.properties. (<a href="https://issues.apache.org/jira/browse/LOG4J2-845">LOG4J2-845</a>)</p>
</li>
<li>
<p>FlumeAppender: maxDelay not in seconds, but milliseconds. Add time scale to some settings, for example maxDelayMillis instead of maxDelay. The old names are aliased for compatibility. (<a href="https://issues.apache.org/jira/browse/LOG4J2-867">LOG4J2-867</a>)</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="release-notes-2-1-fixed">Fixed</h3>
<div class="ulist">
<ul>
<li>
<p>FlumePersistentManager now handles LockConflictExceptions in Berkeley Db when sending a batch. (<a href="https://issues.apache.org/jira/browse/LOG4J2-391">LOG4J2-391</a>)</p>
</li>
<li>
<p>Fix OSGi Import-Package problem with the JMS API. (<a href="https://issues.apache.org/jira/browse/LOG4J2-663">LOG4J2-663</a>)</p>
</li>
<li>
<p>Some typo fixes and enhancements for the site. (<a href="https://issues.apache.org/jira/browse/LOG4J2-676">LOG4J2-676</a>)</p>
</li>
<li>
<p>Documentation: fixed minor issues with Log4j2 website/documentation. (<a href="https://issues.apache.org/jira/browse/LOG4J2-678">LOG4J2-678</a>)</p>
</li>
<li>
<p>Avoid ConverterKey plugin clashes by using a more predictable plugin loading infrastructure. Plugins have been segmented into three parts: class path, user-specified packages, and OSGi bundles. (<a href="https://issues.apache.org/jira/browse/LOG4J2-745">LOG4J2-745</a>)</p>
</li>
<li>
<p>Reduced CachedClock thread contention. (<a href="https://issues.apache.org/jira/browse/LOG4J2-753">LOG4J2-753</a>)</p>
</li>
<li>
<p>Remove invalid Oracle Maven repository. (<a href="https://issues.apache.org/jira/browse/LOG4J2-782">LOG4J2-782</a>)</p>
</li>
<li>
<p>PatternLayout should use platform character encoding by default, not UTF-8. (<a href="https://issues.apache.org/jira/browse/LOG4J2-783">LOG4J2-783</a>)</p>
</li>
<li>
<p>Documentation: fixed capitalization inconsistency in user manual example config. (<a href="https://issues.apache.org/jira/browse/LOG4J2-785">LOG4J2-785</a>)</p>
</li>
<li>
<p>Fixed issue where log4j-to-slf4j did not work correctly with SLF4J Simple Logger. (<a href="https://issues.apache.org/jira/browse/LOG4J2-796">LOG4J2-796</a>)</p>
</li>
<li>
<p>Documentation: clarified why log4j-core is a compile-time dependency in Maven and Ivy page. (<a href="https://issues.apache.org/jira/browse/LOG4J2-797">LOG4J2-797</a>)</p>
</li>
<li>
<p>Fixed plugin scanning redundancy causing massive slowdowns in certain environments. (<a href="https://issues.apache.org/jira/browse/LOG4J2-798">LOG4J2-798</a>)</p>
</li>
<li>
<p>Prevent NPE when configuration with AsyncLogger/AsyncRoot is reloaded. (<a href="https://issues.apache.org/jira/browse/LOG4J2-807">LOG4J2-807</a>)</p>
</li>
<li>
<p>SimpleLogger throws ArrayIndexOutOfBoundsException for an empty array. (<a href="https://issues.apache.org/jira/browse/LOG4J2-811">LOG4J2-811</a>)</p>
</li>
<li>
<p>MarkerManager Log4jMarker.hasParents() returns opposite of correct result. (<a href="https://issues.apache.org/jira/browse/LOG4J2-813">LOG4J2-813</a>)</p>
</li>
<li>
<p>Fixed memory leak in Tomcat 6 caused by clock background threads unintentionally started by Tomcat after web application stop. (<a href="https://issues.apache.org/jira/browse/LOG4J2-819">LOG4J2-819</a>)</p>
</li>
<li>
<p>Fixed issue in RollingFile filePattern: backslashes are path separators, not escape characters. (<a href="https://issues.apache.org/jira/browse/LOG4J2-829">LOG4J2-829</a>)</p>
</li>
<li>
<p>Respect external interrupt signal to allow application shutdown after joining AsyncAppender thread. (<a href="https://issues.apache.org/jira/browse/LOG4J2-830">LOG4J2-830</a>)</p>
</li>
<li>
<p>ThrowableProxy fails if a class in logged stack trace throws java.lang.Error from initializer (<a href="https://issues.apache.org/jira/browse/LOG4J2-832">LOG4J2-832</a>)</p>
</li>
<li>
<p>Migrate JdbcH2AppenderTest JUnit performance test to log4j-perf. (<a href="https://issues.apache.org/jira/browse/LOG4J2-840">LOG4J2-840</a>)</p>
</li>
<li>
<p>Migrate JdbcHyperSqlAppenderTest JUnit performance test to log4j-perf. (<a href="https://issues.apache.org/jira/browse/LOG4J2-841">LOG4J2-841</a>)</p>
</li>
<li>
<p>Migrate JpaH2AppenderTest JUnit performance test to log4j-perf. (<a href="https://issues.apache.org/jira/browse/LOG4J2-842">LOG4J2-842</a>)</p>
</li>
<li>
<p>Migrate JpaHyperSqlAppenderTest JUnit performance test to log4j-perf. (<a href="https://issues.apache.org/jira/browse/LOG4J2-843">LOG4J2-843</a>)</p>
</li>
<li>
<p>Documentation: fix broken links on Appenders manual page. (<a href="https://issues.apache.org/jira/browse/LOG4J2-855">LOG4J2-855</a>)</p>
</li>
<li>
<p>Documentation: fix broken links on left navigation Extending Log4j Configuration sub-menu. (<a href="https://issues.apache.org/jira/browse/LOG4J2-861">LOG4J2-861</a>)</p>
</li>
<li>
<p>Fixed classloader issue that prevented Log4j from finding the implementation when used in a custom Ant task. (<a href="https://issues.apache.org/jira/browse/LOG4J2-862">LOG4J2-862</a>)</p>
</li>
<li>
<p>Documentation: fixed missing closing parenthesis in code example. (<a href="https://issues.apache.org/jira/browse/LOG4J2-866">LOG4J2-866</a>)</p>
</li>
</ul>
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