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[#release-notes-2-19-0]
== 2.19.0

Release date:: 2022-09-09

This release primarily contains bug fixes 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.
SLF4J-2.0.0 alpha releases are not fully supported.
See https://issues.apache.org/jira/browse/LOG4J2-2975[LOG4J2-2975] and https://jira.qos.ch/browse/SLF4J-511[SLF4J-511].

The Log4j 2.19.0 API, as well as many core components, maintains binary compatibility with previous releases.

Apache Log4j 2.19.0 requires a minimum of Java 8 to build and run.
Log4j 2.12.4 is the last release to support Java 7.
Log4j 2.3.2 is the last release to support Java 6.
Java 6 and Java 7 are no longer supported by the Log4j team.

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 implementation of SLF4J2 fluent API. (https://issues.apache.org/jira/browse/LOG4J2-2975[LOG4J2-2975])
* Add support for SLF4J2 stack-valued MDC. (https://issues.apache.org/jira/browse/LOG4J2-3583[LOG4J2-3583])

=== Changed

* Add getExplicitLevel method to LoggerConfig. (https://issues.apache.org/jira/browse/LOG4J2-3572[LOG4J2-3572])
* Allow PropertySources to be added. (https://issues.apache.org/jira/browse/LOG4J2-3588[LOG4J2-3588])
* Allow Plugins to be injected with the LoggerContext reference. (https://issues.apache.org/jira/browse/LOG4J2-3589[LOG4J2-3589])

=== Removed

* Removed build page in favor of a single build instructions file. (https://issues.apache.org/jira/browse/LOG4J2-3573[LOG4J2-3573])
* Remove SLF4J 1.8.x binding. (https://issues.apache.org/jira/browse/LOG4J2-3590[LOG4J2-3590])

=== Fixed

* Add correct manifest entries for OSGi to log4j-jcl (https://issues.apache.org/jira/browse/LOG4J2-3545[LOG4J2-3545])
* Improve support for passwordless keystores. (https://issues.apache.org/jira/browse/LOG4J2-3548[LOG4J2-3548])
* SystemPropertyArbiter was assigning the value as the name. (https://issues.apache.org/jira/browse/LOG4J2-3550[LOG4J2-3550])
* Make JsonTemplateLayout stack trace truncation operate for each label block. (https://issues.apache.org/jira/browse/LOG4J2-3556[LOG4J2-3556])
* Fix recursion between Log4j 1.2 LogManager and Category. (https://issues.apache.org/jira/browse/LOG4J2-3557[LOG4J2-3557])
* Fix resolution of properties not starting with `log4j2.`. (https://issues.apache.org/jira/browse/LOG4J2-3559[LOG4J2-3559])
* Logger$PrivateConfig.filter(Level, Marker, String) was allocating empty varargs array. (https://issues.apache.org/jira/browse/LOG4J2-3560[LOG4J2-3560])
* Allows a space separated list of style specifiers in the %style pattern for consistency with %highlight. (https://issues.apache.org/jira/browse/LOG4J2-3561[LOG4J2-3561])
* Fix NPE in `log4j-to-jul` in the case the root logger level is null. (https://issues.apache.org/jira/browse/LOG4J2-3564[LOG4J2-3564])
* Fix RollingRandomAccessFileAppender with DirectWriteRolloverStrategy can't create the first log file of different directory. (https://issues.apache.org/jira/browse/LOG4J2-3565[LOG4J2-3565])
* Generate new SSL certs for testing. (https://issues.apache.org/jira/browse/LOG4J2-3578[LOG4J2-3578])
* Fix ServiceLoaderUtil behavior in the presence of a SecurityManager. (https://issues.apache.org/jira/browse/LOG4J2-3579[LOG4J2-3579])
* Make StatusConsoleListener use SimpleLogger internally. (https://issues.apache.org/jira/browse/LOG4J2-3584[LOG4J2-3584])
* Fix regression in Rfc5424Layout default values. (https://issues.apache.org/jira/browse/LOG4J2-3587[LOG4J2-3587])
* Harden InstantFormatter against delegate failures. (https://issues.apache.org/jira/browse/LOG4J2-3614[LOG4J2-3614])
* Add async support to `Log4jServletFilter`. (https://issues.apache.org/jira/browse/LOG4J2-708[LOG4J2-708])
