The Apache Log4j 2 team is pleased to announce the Log4j 2.0-rc2 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 of the improvements available in Logback while fixing some inherent
problems in Logback's
architecture.
It is the Log4j team's intention that this will be the final release candidate
Log4j 2 before general availability and
is being made available to encourage use and feedback from the community.
Changes in this version include:
New features:
o LOG4J2-675: RollingFile and RollingRandomAccessFile now write the layout
footer before rollover.
o LOG4J2-674: Made RollingFileAppender buffer size configurable.
o LOG4J2-42: Create an appender to route log events to the ServletContext log.
o LOG4J2-655: Add Vagrantfile for testing in GNU+Linux.
o LOG4J2-654: Add log4j-perf module to provide a home for all log4j
performance tests.
Add support for JMH microbenchmark performance tests.
o LOG4J2-652: Add support for default plugin values and attributes.
o LOG4J2-598: Add support for types other than String for plugin factory
values/attributes.
o LOG4J2-644: Implement a SecureSocketAppender and secure server (SSL/TLS).
o LOG4J2-629: Document the system properties used in Log4J 2.
o LOG4J2-595: Introduce Java annotation processor as alternative plugin
pre-caching mechanism. This is available in the
log4j-plugin-processor module.
o LOG4J2-576: Add org.apache.logging.log4j.Logger.getLevel().
o LOG4J2-439: Add EncodingPatternConverter to escape newlines and HTML special
characters. Thanks to Bruce Brouwer.
o LOG4J2-427: Add support for configuration via YAML. Thanks to Alexander
Reelsen.
Fixed Bugs:
o LOG4J2-581: RollingRandomAccessFile now writes the layout header after
rollover. Thanks to Alexander Khokhlov.
o LOG4J2-622: RollingFileManager now correctly honours the bufferedIO
configuration after rollover. Thanks to Farooq Khan.
o LOG4J2-141: Improved documentation regarding log4j status logger. Thanks to
Joern Huxhorn.
o LOG4J2-539: Fixed issue with "Reconfigure using XML below" function in JMX
Client GUI.
ConfigurationSource is now a top-level class and can be obtained with
Configuration.getConfigurationSource().
LoggerContext.getConfiguration().getConfigurationSource()
provides a reliable public method for obtaining a logger context's
configuration location and content. Thanks to Colin Froggatt.
o LOG4J2-619: Invalid XML configuration files do not prevent the config file
from being checked again. Thanks to Scott Harrington.
o LOG4J2-637: JMX: Updating a Logger's level via jConsole now correctly takes
effect. Thanks to Mansoor Sajjad, Jon Wilmoth.
o LOG4J2-668: Correctly process log events when combining AsyncLoggers with
AsyncAppender.
o LOG4J2-669: Prevent NPE when combining AsyncLoggers with AsyncLoggerConfigs.
o LOG4J2-563: FlumeAvroManager now always uses a client type of
default_failover. Thanks to Michael Friedmann.
o LOG4J2-535: Reset rollover time when size rollover is triggered.
o LOG4J2-664: Moved plugin cache file to META-INF for OSGi compatibility.
o LOG4J2-640: Fix NPE that can be caused by a null ThreadContextClassLoader.
o LOG4J2-651: Log4j 2 throws ArrayIndexOutOfBoundsException.
o LOG4J2-620: Perform reconfiguration in a separate thread to prevent
deadlocks.
o LOG4J2-639: Prevent NPE in AsyncLogger and AsyncLoggerConfig if logger is
used after log4j has been shut down. Thanks to Mck SembWever.
o LOG4J2-469: FailoverAppender was not resetting its status after the primary
appender recovered.
o LOG4J2-623: Generate MDC properties as a JSON map in JSONLayout.
o LOG4J2-520: Resolved issue where AsyncAppender dropped events if queue still
contained
events when application is stopped. Thanks to JavaTech, Andre Bogus.
o LOG4J2-392: Resolved a problem with the previous solution for LOG4J2-392
that resulted in dropped events
when using AsyncLoggerConfig with slow appenders when application is
stopped. Thanks to Andre Bogus.
o LOG4J2-613: The OSGi version of log4j-web imports Servlet 2.5 at minimum
instead of 3.0.
o LOG4J2-602: Unit tests are now less verbose during the build process.
o LOG4J2-570: Fix shutdown thread memory leak in servlet containers.
o LOG4J2-542: Make Throwable transient in ThrowableProxy.
o LOG4J2-440: During shutdown, a NullPointerException could be thrown due to
the NullConfiguration class no longer being
available to the ClassLoader.
o LOG4J2-346: Cyclic dependency with log4j-slf4j-impl in OSGi.
o LOG4J2-345: The log4j-1.2-api module didn't export any packages to OSGi.
o LOG4J2-605: Password data from the NoSQL plugins no longer shows up in
cleartext in debug logging.
o LOG4J2-448: A StringIndexOutOfBounds exception could occur during property
substitution. Thanks to X86core.
o LOG4J2-597: StatusLogger was not skipping multiple instances of the FQCN
class, causing messages from classes in
the Verbose list to be printed.
o LOG4J2-564: Renamed SLF4J logger class to Log4jLogger.
o LOG4J2-579: Rework Level comparison APIs.
o LOG4J2-560: SyslogAppenderTest and RFC5424LayoutTest were failing in Java 8.
o LOG4J2-499: Add equals and hashcode to Log4jLogEvent.
o LOG4J2-378: Add DateLookup and ThreadContextLookup to default lookups.
Changes:
o LOG4J2-419: Support default value for missing key in look ups with
fallbacking to looking in the properties map. Thanks to Woonsan Ko.
o LOG4J2-554: Allow configuration files to be located as Servlet Context
resources.
o LOG4J2-250: Refactor Log4jLogEvent to lazily create ThrowableProxy.
o LOG4J2-647: Upgrade to Flume 1.5.0.
o LOG4J2-646: Merge the TLS Syslog appender into the Syslog appender.
o LOG4J2-641: Override commons-logging dependency version in tests.
o LOG4J2-566: Made RollingRandomAccessFileAppender buffer size configurable.
Thanks to Luigi Alice.
o LOG4J2-628: Use Clock to generate all log event timestamps, not just for
Async Loggers.
o LOG4J2-617: Update SLF4J to 1.7.7.
o LOG4J2-616: Update Jackson to 2.3.3.
o LOG4J2-585: Add support for multiple parents to Markers. Thanks to Bruce
Brouwer.
o LOG4J2-574: Make Blocking the default WaitStrategy for Async Loggers.
o LOG4J2-555: Introduce ExtendedLogger interface to facilitate implementing
and extending Loggers. Thanks to Bruce Brouwer.
o LOG4J2-561: Allow spaces around commas in Configuration's package attribute.
Thanks to vibin.
o LOG4J2-547: Have Logger API expose a PrintWriter instead of custom
LoggerStream. Thanks to Bruce Brouwer.
o LOG4J2-496: Allow header and footer to be specified as lookup patterns in
PatternLayout.
o LOG4J2-410: SLf4JLogger is now Serializable. Thanks to Ivlin Zeng.
o LOG4J2-468: Add support to add a LoggerConfig. Document two ways to modify
the configuration.
o LOG4J2-582: Rename org.apache.logging.log4j.core.net.SocketServer to
TCPSocketServer and refactor with UDP.
o LOG4J2-592: Update Jackson to 2.3.2 from 2.2.2.
Apache Log4j 2.0-rc2 requires a minimum of Java 6 to build and run. 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/
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