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[#release-notes-2-13-1]
== 2.13.1

Release date:: 2020-02-25

This release contains bugfixes and minor enhancements.

Due to a break in compatibility in the SLF4J binding, Log4j now ships with two versions of the SLF4J to Log4j adapters.
`log4j-slf4j-impl` should be used with SLF4J 1.7.x and earlier and `log4j-slf4j18-impl` should be used with SLF4J 1.8.x and later.

Note that the XML, JSON and YAML formats changed in the 2.11.0 release: they no longer have the `timeMillis` attribute and instead have an `Instant` element with `epochSecond` and `nanoOfSecond` attributes.

The Log4j 2.13.1 API, as well as many core components, maintains binary compatibility with previous releases.

Log4j 2.13.1 requires a minimum of Java 8 to build and run.
Log4j 2.3 was the last release that supported Java 6 and Log4j 2.11.2 is the last release to support Java 7.

For complete information on Apache Log4j 2, including instructions on how to submit bug reports, patches, or suggestions for improvement, see http://logging.apache.org/log4j/2.x/[the Apache Log4j 2 website].


=== Added

* Implement ISO8601_PERIOD_MICROS fixed date format matching ISO8601_PERIOD with support for microsecond precision. (https://issues.apache.org/jira/browse/LOG4J2-2748[LOG4J2-2748])

=== Changed

* Update log4j-slf4j18-impl slf4j version to 1.8.0-beta4 from 1.8.0-alpha2. (https://issues.apache.org/jira/browse/LOG4J2-2745[LOG4J2-2745])
* Update dependencies. (https://issues.apache.org/jira/browse/LOG4J2-2763[LOG4J2-2763])
* Add a retry count attribute to the KafkaAppender. (https://issues.apache.org/jira/browse/LOG4J2-2777[LOG4J2-2777])
* Use LinkedBlockingQueue instead of synchronized collection in StatusConfiguration. (https://issues.apache.org/jira/browse/LOG4J2-2782[LOG4J2-2782])
* Conditionally perform status logging calculations in PluginRegistry. (https://issues.apache.org/jira/browse/LOG4J2-2789[LOG4J2-2789])

=== Fixed

* Rollover fails when file matches pattern but index is too large. (https://issues.apache.org/jira/browse/LOG4J2-2039[LOG4J2-2039])
* Allow Lookup keys with leading dashes by using a slash as an escape character. (https://issues.apache.org/jira/browse/LOG4J2-2211[LOG4J2-2211])
* Fix lock contention in the classloader using new versions of slf4j without EventData on slf4j logger creation. (https://issues.apache.org/jira/browse/LOG4J2-2415[LOG4J2-2415])
* CronExpression.getBeforeTime() would sometimes return incorrect result. (https://issues.apache.org/jira/browse/LOG4J2-2575[LOG4J2-2575])
* GraalVM does not allow use of MethodHandles. (https://issues.apache.org/jira/browse/LOG4J2-2649[LOG4J2-2649])
* JSON output wrong when using additional fields. (https://issues.apache.org/jira/browse/LOG4J2-2652[LOG4J2-2652])
* PluginProcessor should use Messager instead of System.out. (https://issues.apache.org/jira/browse/LOG4J2-2676[LOG4J2-2676])
* Rollover handles parallel file deletion gracefully. (https://issues.apache.org/jira/browse/LOG4J2-2677[LOG4J2-2677])
* MapMessage.getFormattedMessage() would incorrectly format objects. (https://issues.apache.org/jira/browse/LOG4J2-2703[LOG4J2-2703])
* Slow initialization on Windows due to accessing network interfaces. (https://issues.apache.org/jira/browse/LOG4J2-2717[LOG4J2-2717])
* PluginCache output is reproducible allowing the annotation processor to produce deterministic results. (https://issues.apache.org/jira/browse/LOG4J2-2735[LOG4J2-2735])
* Fix erroneous log4j-jul recursive logger detection resulting in some no-op JUL loggers and 'WARN Recursive call to getLogger' being reported by the status logger. (https://issues.apache.org/jira/browse/LOG4J2-2739[LOG4J2-2739])
* Remove unnecessary EventLogger references from log4j-slf4j18-impl due to removal from slf4j. (https://issues.apache.org/jira/browse/LOG4J2-2744[LOG4J2-2744])
* ClassLoaderContextSelector was not locating the LoggerContext during shutdown. (https://issues.apache.org/jira/browse/LOG4J2-2746[LOG4J2-2746])
* Fix a memory leak using fully asynchronous logging when the queue is full using the 'discard' asynchronous queue full strategy. (https://issues.apache.org/jira/browse/LOG4J2-2747[LOG4J2-2747])
* Fix StackLocator.getCallerClass performance in cases where Reflection.getCallerClass is not accessible. (https://issues.apache.org/jira/browse/LOG4J2-2751[LOG4J2-2751])
* MutableLogEvent and RingBufferLogEvent avoid StringBuffer and parameter array allocation unless reusable messages are used. (https://issues.apache.org/jira/browse/LOG4J2-2752[LOG4J2-2752])
* LoaderUtil.getClassLoaders may discover additional loaders and no longer erroneously returns a result with a null element in some environments. (https://issues.apache.org/jira/browse/LOG4J2-2754[LOG4J2-2754])
* Prevent LoggerContext from being garbage collected while being created. (https://issues.apache.org/jira/browse/LOG4J2-2756[LOG4J2-2756])
* NullPointerException when using a custom DirectFileRolloverStrategy without a file name. (https://issues.apache.org/jira/browse/LOG4J2-2758[LOG4J2-2758])
* RollingFileAppender was not rolling on startup if createOnDemand was set to true. (https://issues.apache.org/jira/browse/LOG4J2-2759[LOG4J2-2759])
* Always write header on a new OutputStream. (https://issues.apache.org/jira/browse/LOG4J2-2760[LOG4J2-2760])
* [JDBC] MS-SQL Server JDBC driver throws SQLServerException when inserting a null value for a VARBINARY column. (https://issues.apache.org/jira/browse/LOG4J2-2762[LOG4J2-2762])
* Warn if pattern is missing on Routes element. Use default route. (https://issues.apache.org/jira/browse/LOG4J2-2767[LOG4J2-2767])
* Add multi-parameter overloads to LogBuilder. (https://issues.apache.org/jira/browse/LOG4J2-2768[LOG4J2-2768])
* Do not log an error if Files.move does not work. (https://issues.apache.org/jira/browse/LOG4J2-2769[LOG4J2-2769])
* Fixed NullPointerException after reconfiguring via JMX. (https://issues.apache.org/jira/browse/LOG4J2-2770[LOG4J2-2770])
* NullPointerException after reconfiguring via JMX. (https://issues.apache.org/jira/browse/LOG4J2-2770[LOG4J2-2770])
* An error message in RollingFileAppender uses a placeholder for the name but does not specify the name argument in the logging call (https://issues.apache.org/jira/browse/LOG4J2-2776[LOG4J2-2776])
* ServletContainerInitializer was obtaining the StatusLogger too soon. (https://issues.apache.org/jira/browse/LOG4J2-2781[LOG4J2-2781])
* Counter stuck at 10 and overwriting files when leading zeros used in the file pattern count. (https://issues.apache.org/jira/browse/LOG4J2-2784[LOG4J2-2784])
