--- layout: post status: PUBLISHED published: true title: Log4j 2.11 released excerpt: "

\r\nThe Apache Log4j 2 team is pleased to announce the Log4j 2.11 release!\r\n

\r\n\r\nApache 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.\r\n

\r\n\r\nThis release contains new features, bugfixes and minor enhancements. One 2.11 feature worth highlighting is that log timestamps can now have microsecond or nanosecond precision when running on Java 9.\r\n

\r\n\r\nNote 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.\r\n

" id: 82f925ae-014a-4ef2-a313-3ea07c4a15a0 date: '2018-03-17 02:55:47 -0400' categories: logging tags: - logging - log4j - log4j2 permalink: logging/entry/log4j-2-11-released ---

The Apache Log4j 2 team is pleased to announce the Log4j 2.11 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.

This release contains new features, bugfixes and minor enhancements. One 2.11 feature worth highlighting is that log timestamps can now have microsecond or nanosecond precision when running on Java 9.

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.

As of Log4j 2.9.0, the Log4j API was modified to use java.util.ServiceLoader to locate Log4j implementations, although the former binding mechanism is still supported. The Log4j API jar is now a multi-release jar to provide implementations of Java 9 specific classes. Multi-release jars are not supported by the OSGi specification so OSGi modules will not be able to take advantage of these implementations but will not lose functionality as they will fall back to the implementations used in Java 7 and 8. More details on the new features and fixes are itemized below. Note that some tools are not compatible with multi-release jars and may fail trying to process class files in the META-INF/versions/9 folder. Those errors should be reported to the tool vendor.

Note that subsequent to the 2.9 release, for security reasons, SerializedLayout is deprecated and no
longer used as default in the Socket and JMS appenders. SerializedLayout can still be used as before,
but has to be specified explicitly. To retain old behaviour, you have to change configuration like:

into:

We do, however, discourage the use of SerializedLayout and recommend JsonLayout as a replacement:

Note that subsequent to the 2.9 release, for security reasons, Log4j does not process DTD in XML files.
If you used DTD for including snippets, you have to use XInclude or Composite Configuration instead.

The Log4j 2.11.0 API, as well as many core components, maintains binary compatibility with previous releases with the following exceptions to Log4j Core. Log4j 2.11.0 moves code from log4j-core to several new Maven modules. Dependencies to other jars that used to be optional in log4j-core are now required in the new modules. The code in these modules have been repackaged. These changes do not affect your configuration files.

The new modules are:

log4j-jdbc-dbc2

log4j-jpa

log4j-mongodb2

log4j-mongodb3

GA Release 2.11.0

Changes in this version include:

New Features

Fixed Bugs

Changes

Apache Log4j 2.11.0 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 Apache Log4j 2 website:

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