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[#release-notes-2-8-1]
== 2.8.1

Release date:: 2017-02-26

This release primarily contains bugfixes and minor enhancements.
More details on the new features and fixes are itemized below.

Note that subsequent to the 2.6 release a minor source incompatibility was found due to the addition of new methods to the `Logger` interface.
If you have code that does:

[source,java]
----
logger.error(null, “This is the log message”, throwable);
----

or similar with any log level you will get a compiler error saying the reference is ambiguous.
To correct this either do:

[source,java]
----
logger.error(“This is the log message”, throwable);
----

or

[source,java]
----
logger.error((Marker) null, “This is the log message”, throwable);
----

The Log4j 2.8.1 API, as well as many core components, maintains binary compatibility with previous releases.

Log4j 2.8.1 requires a minimum of Java 7 to build and run.
Log4j 2.3 was the last release that supported Java 6.

Basic compatibility with Log4j 1.x is provided through the `log4j-1.2-api` component, however it does
not implement some of the very implementation specific classes and methods.
The package names and Maven `groupId` have been changed to `org.apache.logging.log4j` to avoid any conflicts with Log4j 1.x.

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

* [core] Add and implement LogEvent.toImmutable(). (https://issues.apache.org/jira/browse/LOG4J2-1807[LOG4J2-1807])
* Remove deprecation on MessageSupplier lambda functions in Logger API. (https://issues.apache.org/jira/browse/LOG4J2-1823[LOG4J2-1823])

=== Changed

* Update to use Logback 1.1.10 and then Logback 1.2 for tests. (https://issues.apache.org/jira/browse/LOG4J2-1810[LOG4J2-1810])
* Improved error message when log4j 2 configuration file not found. (https://issues.apache.org/jira/browse/LOG4J2-1812[LOG4J2-1812])
* Update Jackson from 2.8.5 to 2.8.6. (https://issues.apache.org/jira/browse/LOG4J2-1819[LOG4J2-1819])
* Update SLF4J to 1.7.24. (https://issues.apache.org/jira/browse/LOG4J2-1822[LOG4J2-1822])

=== Fixed

* Fix ClassNotFoundException org.apache.logging.log4j.core.util.ExecutorServices in OSGi tests. (https://issues.apache.org/jira/browse/LOG4J2-1753[LOG4J2-1753])
* Fixed bug in PropertiesUtil::getCharsetProperty that caused UnsupportedCharsetException for ConsoleAppender. (https://issues.apache.org/jira/browse/LOG4J2-1799[LOG4J2-1799])
* Report errors when sending to Kafka when using syncSend=false. (https://issues.apache.org/jira/browse/LOG4J2-1800[LOG4J2-1800])
* Fix Maven POM to ensure JMH generated classes in log4j-perf are included in benchmarks jar. (https://issues.apache.org/jira/browse/LOG4J2-1803[LOG4J2-1803])
* Allow %i in file pattern to be preceded with characters other than just '-'. (https://issues.apache.org/jira/browse/LOG4J2-1804[LOG4J2-1804])
* Fixed rare race condition in FixedDateFormat, made FixedDateFormat::millisSinceMidnight method public. (https://issues.apache.org/jira/browse/LOG4J2-1805[LOG4J2-1805])
* Fix Javadoc for DefaultRolloverStrategy::purgeAscending (https://issues.apache.org/jira/browse/LOG4J2-1806[LOG4J2-1806])
* Change minOccur to minOccurs in Log4j-config.xsd. (https://issues.apache.org/jira/browse/LOG4J2-1816[LOG4J2-1816])
* Fix rollover to work when filePattern contains no directory components. (https://issues.apache.org/jira/browse/LOG4J2-1818[LOG4J2-1818])
