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2.20.0

Release date

2023-02-17

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 LOG4J2-2975 and SLF4J-511.

The Log4j 2.20.0 API, as well as many core components, maintains binary compatibility with previous releases.

Apache Log4j 2.20.0 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 the Apache Log4j 2 website.

Added

  • Add support for timezones in RollingFileAppender date pattern (LOG4J2-1631)

  • Add LogEvent timestamp to ProducerRecord in KafkaAppender (LOG4J2-2678)

  • Add PatternLayout support for abbreviating the name of all logger components except the 2 rightmost (LOG4J2-2785)

  • Removes internal field that leaked into public API. (LOG4J2-3615)

  • Add a LogBuilder#logAndGet() method to emulate the Logger#traceEntry method. (LOG4J2-3645)

Changed

  • Simplify site generation (1166)

  • Switch the issue tracker from JIRA to GitHub Issues (1172)

  • Remove liquibase-log4j2 maven module (1193)

  • Fix order of stacktrace elements, that causes cache misses in ThrowableProxyHelper. (1214)

  • Switch from com.sun.mail to Eclipse Angus. (LOG4J2-3554)

  • Add Log4j2 Core as default runtime dependency of the SLF4J2-to-Log4j2 API bridge. (LOG4J2-3601)

  • Replace maven-changes-plugin with a custom changelog implementation (LOG4J2-3628)

  • Moved log4j-api and log4j-core artifacts with classifier tests to log4j-api-test and log4j-core-test respectively. (LOG4J2-3650)

Deprecated

  • Deprecate support for package scanning for plugins (LOG4J2-3644)

Fixed

  • Copy programmatically supplied location even if includeLocation="false". (1197)

  • Eliminate status logger warning, when disableAnsi or noConsoleNoAnsi is used the style and highlight patterns. (1202)

  • Fix detection of location requirements in RewriteAppender. (1274)

  • Replace regex with manual code to escape characters in Rfc5424Layout. (1277)

  • Fix java.sql.Time object formatting in MapMessage (LOG4J2-2297)

  • Fix previous fire time computation in CronTriggeringPolicy (LOG4J2-3357)

  • Correct default to not include location for AsyncRootLoggers (LOG4J2-3487)

  • Lazily evaluate the level of a SLF4J LogEventBuilder (LOG4J2-3598)

  • Fixes priority of Legacy system properties, which are now back to having higher priority than Environment variables. (LOG4J2-3615)

  • Protects ServiceLoaderUtil from unchecked ServiceLoader exceptions. (LOG4J2-3624)

  • Fix Configurator#setLevel for internal classes (LOG4J2-3631)

  • Fix level propagation in Log4jBridgeHandler (LOG4J2-3634)

  • Disable OsgiServiceLocator if not running in OSGI container. (LOG4J2-3642)

  • When using a Date Lookup in the file pattern the current time should be used. (LOG4J2-3643)

  • Fixed LogBuilder filtering in the presence of global filters. (LOG4J2-3647)