[ANNOUNCE] Apache Log4j 2.17.1 released

[Matt Sicker <ma...@apache.org>]

The Apache Log4j 2 team is pleased to announce the Log4j 2.17.1 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 the changes noted below:

Address CVE-2021-44832.
Other minor fixes.

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 and
https://jira.qos.ch/browse/SLF4J-511.

The Log4j 2.17.1 API, as well as many core components, maintains
binary compatibility with previous releases.

GA Release 2.17.1

Changes in this version include:

Fixed Bugs

LOG4J2-3293: JdbcAppender now uses JndiManager to access JNDI
resources. JNDI is only enabled when system property
log4j2.enableJndiJdbc is set to true.
LOG4J2-3290: Remove unused method.
LOG4J2-3292: ExtendedLoggerWrapper.logMessage no longer double-logs
when location is requested.
LOG4J2-3289: log4j-to-slf4j no longer re-interpolates formatted
message contents.
LOG4J2-3204: Correct SpringLookup package name in Interpolator. Thanks
to Francis-FY.
LOG4J2-3284: log4j-to-slf4j takes the provided MessageFactory into
account Thanks to Michael Vorburger.
LOG4J2-3264: Fix MapLookup to lookup MapMessage before DefaultMap
Thanks to Yanming Zhou.
LOG4J2-3274: Buffered I/O checked had inverted logic in
RollingFileAppenderBuidler. Thanks to Faisal Khan Thayub Khan.
: Fix NPE when input is null in StrSubstitutor.replace(String, Properties).
LOG4J2-3270: Lookups with no prefix only read values from the
configuration properties as expected.
LOG4J2-3256: Reduce ignored package scope of KafkaAppender. Thanks to
Lee Dongjin.

________________________________

Apache Log4j 2.17.1 requires a minimum of Java 8 to build and run.
Log4j 2.12.1 is the last release to support Java 7. Java 7 is 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 the Apache Apache Log4j 2 website:

https://logging.apache.org/log4j/2.x/

-- 
Matt Sicker
PMC Member, Logging Services, Apache Software Foundation