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:

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:

logger.error(“This is the log message”, throwable);

or

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 the Apache Log4j 2 website.

Added

  • [core] Add and implement LogEvent.toImmutable(). (LOG4J2-1807)

  • Remove deprecation on MessageSupplier lambda functions in Logger API. (LOG4J2-1823)

Changed

  • Update to use Logback 1.1.10 and then Logback 1.2 for tests. (LOG4J2-1810)

  • Improved error message when log4j 2 configuration file not found. (LOG4J2-1812)

  • Update Jackson from 2.8.5 to 2.8.6. (LOG4J2-1819)

  • Update SLF4J to 1.7.24. (LOG4J2-1822)

Fixed

  • Fix ClassNotFoundException org.apache.logging.log4j.core.util.ExecutorServices in OSGi tests. (LOG4J2-1753)

  • Fixed bug in PropertiesUtil::getCharsetProperty that caused UnsupportedCharsetException for ConsoleAppender. (LOG4J2-1799)

  • Report errors when sending to Kafka when using syncSend=false. (LOG4J2-1800)

  • Fix Maven POM to ensure JMH generated classes in log4j-perf are included in benchmarks jar. (LOG4J2-1803)

  • Allow %i in file pattern to be preceded with characters other than just '-'. (LOG4J2-1804)

  • Fixed rare race condition in FixedDateFormat, made FixedDateFormat::millisSinceMidnight method public. (LOG4J2-1805)

  • Fix Javadoc for DefaultRolloverStrategy::purgeAscending (LOG4J2-1806)

  • Change minOccur to minOccurs in Log4j-config.xsd. (LOG4J2-1816)

  • Fix rollover to work when filePattern contains no directory components. (LOG4J2-1818)