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[#release-notes-2-13-0]
== 2.13.0

Release date:: 2019-12-11

This release contains bugfixes and minor enhancements.
Some of the new features in this release are:

* Log4j 2 now requires Java 8 or higher to build and run.
* Experimental support for Log4j 1 configuration files.
See Log4j 2 Compatiblity with Log4j 1.
* The Logger API has been enhanced to support a builder pattern.
This can dramatically improve the overhead of capturing location information.
See Log Builder.
* Better integration with Spring Boot by providing access to Spring variables in Log4j 2 configuration files and allowing Log4j 2 system properties to be defined in the Spring configuration.
See Logging in the Cloud.
* Support for accessing Kubernetes information via a Log4j 2 Lookup.
* The Gelf Layout now allows the message to be formatted using a `PatternLayout` pattern.
Logging in the Cloud provides an example of this, as well as the use of the Spring and Kubernetes Lookups.

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 2.13.0 API, as well as many core components, maintains binary compatibility with previous releases.

Log4j 2.13.0 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

* Add builder pattern to Logger interface. (https://issues.apache.org/jira/browse/LOG4J2-2639[LOG4J2-2639])
* Allow Spring Boot application properties to be accessed in the Log4j 2 configuration. Add lower and upper case Lookups. (https://issues.apache.org/jira/browse/LOG4J2-2710[LOG4J2-2710])
* Add the ability to lookup Kubernetes attributes in the Log4j configuration. Allow Log4j properties to be retrieved from the Spring environment if it is available. (https://issues.apache.org/jira/browse/LOG4J2-2716[LOG4J2-2716])
* Add a Level Pattern Selector. (https://issues.apache.org/jira/browse/LOG4J2-2731[LOG4J2-2731])
* Add ThreadContext.putIfNotNull method. (https://issues.apache.org/jira/browse/LOG4J2-2732[LOG4J2-2732])
* Add experimental support for Log4j 1 configuration files. (https://issues.apache.org/jira/browse/LOG4J2-63[LOG4J2-63])

=== Changed

* Update Jackson to 2.9.10. (https://issues.apache.org/jira/browse/LOG4J2-2701[LOG4J2-2701])
* Allow message portion of GELF layout to be formatted using a PatternLayout. Allow ThreadContext attributes to be explicitly included or excluded in the GelfLayout. (https://issues.apache.org/jira/browse/LOG4J2-2709[LOG4J2-2709])

=== Fixed

* Prevent recursive calls to java.util.LogManager.getLogger(). (https://issues.apache.org/jira/browse/LOG4J2-2058[LOG4J2-2058])
* Wrong java version check in ThreadNameCachingStrategy. (https://issues.apache.org/jira/browse/LOG4J2-2635[LOG4J2-2635])
* Validation blocks definition of script in properties configuration. (https://issues.apache.org/jira/browse/LOG4J2-2647[LOG4J2-2647])
* Add automatic module names where missing. (https://issues.apache.org/jira/browse/LOG4J2-2672[LOG4J2-2672])
* OutputStreamAppender.Builder ignores setFilter(). (https://issues.apache.org/jira/browse/LOG4J2-2673[LOG4J2-2673])
* Use a less confusing name for the CompositeConfiguration source. (https://issues.apache.org/jira/browse/LOG4J2-2674[LOG4J2-2674])
* Set result of rename action to true if file was copied. (https://issues.apache.org/jira/browse/LOG4J2-2680[LOG4J2-2680])
* @PluginValue does not support attribute names besides "value". (https://issues.apache.org/jira/browse/LOG4J2-2693[LOG4J2-2693])
* ArrayIndexOutOfBoundsException could occur with MAC address longer than 6 bytes. (https://issues.apache.org/jira/browse/LOG4J2-2707[LOG4J2-2707])
* The rolling file appenders would fail to compress the file after rollover if the file name matched the file pattern. (https://issues.apache.org/jira/browse/LOG4J2-2712[LOG4J2-2712])
* LOG4J2-2725 - Added try/finally around event.execute() for RingBufferLogEventHandler to clear memory correctly in case of exception/error (https://issues.apache.org/jira/browse/LOG4J2-2725[LOG4J2-2725])
* Prevent a memory leak when async loggers throw errors. (https://issues.apache.org/jira/browse/LOG4J2-2725[LOG4J2-2725])
* Add setKey method to Kafka Appender Builder. (https://issues.apache.org/jira/browse/LOG4J2-2727[LOG4J2-2727])
