The Apache Log4j 2 team is pleased to announce the Log4j 2.13.0 release!
Apache Log4j is a well known framework for logging application behavior.
Log4j 2 is an upgrade to Log4j that provides significant improvements
over its predecessor, Log4j 1.x, and provides many other modern features
such as support for Markers, lambda expressions for lazy logging,
property substitution using Lookups, multiple patterns on a
PatternLayout and asynchronous Loggers. Another notable Log4j 2 feature
is the ability to be "garbage-free" (avoid allocating temporary objects)
while logging. In addition, Log4j 2 will not lose events while
reconfiguring.
The artifacts may be downloaded from
https://logging.apache.org/log4j/2.x/download.html.
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.
GA Release 2.13.0
Changes in this version include:
New Features
• LOG4J2-2732: Add ThreadContext.putIfNotNull method. Thanks to
Matt Pavlovich.
• LOG4J2-2731: Add a Level Patttern Selector.
• LOG4J2-63: Add experimental support for Log4j 1 configuration files.
• LOG4J2-2716: 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.
• LOG4J2-2710: Allow Spring Boot application properties to be
accessed in the Log4j 2 configuration. Add lower and upper case Lookups.
• LOG4J2-2639: Add builder pattern to Logger interface.
Fixed Bugs
• LOG4J2-2058: Prevent recursive calls to
java.util.LogManager.getLogger().
• LOG4J2-2725: LOG4J2-2725 - Added try/finally around
event.execute() for RingBufferLogEventHandler to clear memory correctly
in case of exception/error Thanks to Dzmitry Anikechanka.
• LOG4J2-2635: Wrong java version check in
ThreadNameCachingStrategy. Thanks to Filipp Gunbin.
• LOG4J2-2674: Use a less confusing name for the
CompositeConfiguration source. Thanks to Anton Korenkov.
• LOG4J2-2727: Add setKey method to Kafka Appender Builder. Thanks
to Clément Mathieu.
• LOG4J2-2707: ArrayIndexOutOfBoundsException could occur with MAC
address longer than 6 bytes. Thanks to Christian Frank.
• LOG4J2-2712: The rolling file appenders would fail to compress
the file after rollover if the file name matched the file pattern.
• LOG4J2-2693: @PluginValue does not support attribute names
besides "value".
• LOG4J2-2647: Validation blocks definition of script in properties
configuration.
• LOG4J2-2680: Set result of rename action to true if file was
copied. Thanks to Guillermo Xavier Hurtado Garcia.
• LOG4J-2672: Add automatic module names where missing. Thanks to
Stephen Colebourne.
• LOG4J2-2673: OutputStreamAppender.Builder ignores setFilter().
Thanks to Yuichi Sugimura.
• LOG4J2-2725: Prevent a memory leak when async loggers throw
errors. Thanks to Dzmitry Anikechanka.
Changes
• LOG4J2-2701: Update Jackson to 2.9.10.
• LOG4J2-2709: Allow message portion of GELF layout to be formatted
using a PatternLayout. Allow ThreadContext attributes to be explicitly
included or excluded in the GelfLayout.
Apache 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
the Apache Apache Log4j 2 website:
https://logging.apache.org/log4j/2.x/
