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From Ralph Goers <ralph.go...@dslextreme.com>
Subject [ANNOUNCE] Apache Log4j 2.9.0 released
Date Thu, 31 Aug 2017 00:26:12 GMT
The Apache Log4j 2 team is pleased to announce the Log4j 2.9.0 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 the first support of Java 9 as well as bugfixes and minor enhancements.
The Log4j API was modified to use java.util.ServiceLoader to locate Log4j implementations,
although the former binding mechanism is still supported. The Log4j jar is now a multi-release
jar to provide implementations of the 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 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:

  <Socket name="socket" host="localhost" port="9500"/>

  <Socket name="socket" host="localhost" port="9500">
We do, however, discourage the use of SerializedLayout and recommend JsonLayout as a replacement:

  <Socket name="socket" host="localhost" port="9500">
    <JsonLayout properties="true"/>
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 2.9.0 API, as well as many core components, maintains binary compatibility with
previous releases.

Release 2.9.0

Changes in this version include:


LOG4J2-2008 <https://issues.apache.org/jira/browse/LOG4J2-2008>: Support printing multiple
StructuredData elements in RFC5424Layout.
LOG4J2-1986 <https://issues.apache.org/jira/browse/LOG4J2-1986>: Public API for parsing
the output from JsonLayout/XmlLayout/YamlLayout into a LogEvent.
LOG4J2-1981 <https://issues.apache.org/jira/browse/LOG4J2-1981>: JsonLayout, XmlLayout
and YamlLayout support 0-byte termination of log events.
LOG4J2-1864 <https://issues.apache.org/jira/browse/LOG4J2-1864>: Support capped collections
for MongoDb appender. Thanks to Matthias Kappeller.
LOG4J2-1813 <https://issues.apache.org/jira/browse/LOG4J2-1813>: Log4j2 will now print
all internal logging to the console if system property log4j2.debug is defined with any value
(or no value).
LOG4J2-1766 <https://issues.apache.org/jira/browse/LOG4J2-1766>: Temporary compress
directory during rollover (#88). Thanks to Pierrick HYMBERT.
LOG4J2-1814 <https://issues.apache.org/jira/browse/LOG4J2-1814>: Added wrapper classes
CustomLoggerGenerator and ExtendedLoggerGenerator to avoid class name with a dollar ($) character
which has special meaning in many *nix command line environments.
LOG4J2-1884 <https://issues.apache.org/jira/browse/LOG4J2-1884>: Added process ID (pid)
pattern converter.
LOG4J2-1699 <https://issues.apache.org/jira/browse/LOG4J2-1699>: Configurable Log File
Permissions with PosixFilePermission. Thanks to Demetrios Dimatos, Pierrick HYMBERT.
LOG4J2-1945 <https://issues.apache.org/jira/browse/LOG4J2-1945>: Generate source jas
for all test jars.
LOG4J2-1934 <https://issues.apache.org/jira/browse/LOG4J2-1934>: JMS Appender does not
know how to recover from a broken connection.
LOG4J2-1955 <https://issues.apache.org/jira/browse/LOG4J2-1955>: JMS Appender should
be able connect to a broker (later) even it is not present at configuration time.
LOG4J2-1874 <https://issues.apache.org/jira/browse/LOG4J2-1874>: Added methods ::writeBytes(ByteBuffer)
and ::writeBytes(byte[], int, int) to ByteBufferDestination interface and use these methods
in TextEncoderHelper where possible to prepare for future enhancements to reduce lock contention.
Thanks to Roman Leventov.
LOG4J2-1442 <https://issues.apache.org/jira/browse/LOG4J2-1442>: Generic HTTP appender.
LOG4J2-1935 <https://issues.apache.org/jira/browse/LOG4J2-1935>: Add with(String, primitive)
methods to org.apache.logging.log4j.message.MapMessage.
LOG4J2-1930 <https://issues.apache.org/jira/browse/LOG4J2-1930>: Add forEach() methods
to org.apache.logging.log4j.message.MapMessage.
LOG4J2-1932 <https://issues.apache.org/jira/browse/LOG4J2-1932>: Add containsKey() methods
to org.apache.logging.log4j.message.MapMessage.
LOG4J2-1854 <https://issues.apache.org/jira/browse/LOG4J2-1854>: Support null byte delimiter
in GelfLayout. Thanks to Xavier Jodoin.
LOG4J2-1359 <https://issues.apache.org/jira/browse/LOG4J2-1359>: Add support for Java
9 StackWalker.
LOG4J2-1880 <https://issues.apache.org/jira/browse/LOG4J2-1880>: Warn when a configuration
file for an inactive ConfigurationFactory is found.
LOG4J2-1855 <https://issues.apache.org/jira/browse/LOG4J2-1855>: Add an optional random
delay in TimeBasedTriggeringPolicy Thanks to Anthony Maire.
LOG4J2-1860 <https://issues.apache.org/jira/browse/LOG4J2-1860>: Shortcut to add Property
and KeyValuePair component in ConfigurationBuilder.
LOG4J2-1294 <https://issues.apache.org/jira/browse/LOG4J2-1294>: The JMS Appender should
use a JMS MapMessage for a Log4j MapMessage.

LOG4J2-1833 <https://issues.apache.org/jira/browse/LOG4J2-1833>: Prevent NullPointerException
when a file name is specified with the DirectWriteRolloverStrategy.
LOG4J2-2018 <https://issues.apache.org/jira/browse/LOG4J2-2018>: Fix incorrect documentation
for LoggerNameLevelRewritePolicy.
LOG4J2-922 <https://issues.apache.org/jira/browse/LOG4J2-922>: Parameter of mdcId in
SyslogAppender has no default value. Thanks to angus.aqlu, Paul Burrowes.
LOG4J2-2001 <https://issues.apache.org/jira/browse/LOG4J2-2001>: StyleConverter.newInstance
argument validation is incorrect. Thanks to Paul Burrowes.
LOG4J2-1999 <https://issues.apache.org/jira/browse/LOG4J2-1999>: HighlightConverter
converts all unrecognized levels to DEBUG. Thanks to Paul Burrowes.
LOG4J2-2013 <https://issues.apache.org/jira/browse/LOG4J2-2013>: SslSocketManager does
not apply SSLContext on TCP reconnect. Thanks to Taylor Patton, Gary Gregory.
LOG4J2-2016 <https://issues.apache.org/jira/browse/LOG4J2-2016>: Mark FileRenameAction
as successful when using alternative ways to move files. Thanks to Benjamin Jaton.
LOG4J2-2012 <https://issues.apache.org/jira/browse/LOG4J2-2012>: No compression when
using a separate drive in Linux. Thanks to Benjamin Jaton.
LOG4J2-1888 <https://issues.apache.org/jira/browse/LOG4J2-1888>: Log4j throws a java.nio.charset.UnsupportedCharsetException:
cp65001. Thanks to Misagh Moayyed.
LOG4J2-1990 <https://issues.apache.org/jira/browse/LOG4J2-1990>: ConcurrentModificationException
logging a parameter of type Map. Thanks to Philippe Mouawad.
LOG4J2-1311 <https://issues.apache.org/jira/browse/LOG4J2-1311>: SocketAppender will
lose several events after re-connection to server. Thanks to Xibing Liang.
LOG4J2-1977 <https://issues.apache.org/jira/browse/LOG4J2-1977>: Consider the StringBuilder's
capacity instead of content length when trimming. Thanks to Jerry xnslong.
LOG4J2-1971 <https://issues.apache.org/jira/browse/LOG4J2-1971>: Register log4j-core
as an OSGi service. Skip tests for LOG4J2-1766 on MacOS. Use group "staff" for LOG4J2-1699
test on MacOS.
LOG4J2-1994 <https://issues.apache.org/jira/browse/LOG4J2-1994>: TcpSocketServer does
not close accepted Sockets.
LOG4J2-1987 <https://issues.apache.org/jira/browse/LOG4J2-1987>: Log4J JUL Bridge and
RMI Security Manager causes access denied ("java.util.logging.LoggingPermission" "control")
Thanks to Andreas Felder.
LOG4J2-1982 <https://issues.apache.org/jira/browse/LOG4J2-1982>: Log4j-config.xsd only
allows one AppenderRef element for each Logger element. Thanks to Christoph Lembeck.
LOG4J2-1985 <https://issues.apache.org/jira/browse/LOG4J2-1985>: Fix default buffer
size to match documentation (from 8102 to 8192 a.k.a. 8KB.) Thanks to Kenneth McFarland.
LOG4J2-1912 <https://issues.apache.org/jira/browse/LOG4J2-1912>: CompositeConfiguration
logs warning "Unable to determine URI for configuration." However, the reconfiguration is
completed. Thanks to R Ri.
LOG4J2-1964 <https://issues.apache.org/jira/browse/LOG4J2-1964>: Dynamic reconfiguration
does not work for filePattern of RollingFile. Thanks to Pierrick HYMBERT.
LOG4J2-1961 <https://issues.apache.org/jira/browse/LOG4J2-1961>: Reconfigure breaks
DirectWriteRolloverStrategy. Thanks to Christian Vent.
LOG4J2-1943 <https://issues.apache.org/jira/browse/LOG4J2-1943>: The eventPrefix attribute
was being ignored in the RFC5424Layout.
LOG4J2-1953 <https://issues.apache.org/jira/browse/LOG4J2-1953>: JndiManager is not
released when the JmsAppender builder catches an exception trying to build itself.
LOG4J2-1911 <https://issues.apache.org/jira/browse/LOG4J2-1911>: Improve the documentation
of the DynamicThresholdFilter.
LOG4J2-1929 <https://issues.apache.org/jira/browse/LOG4J2-1929>: EOFException with FormattedMessage.
Thanks to Borys Sokolov.
LOG4J2-1948 <https://issues.apache.org/jira/browse/LOG4J2-1948>: Trim levels read from
properties file to remove trailing spaces. Thanks to Michael Lück.
LOG4J2-1971 <https://issues.apache.org/jira/browse/LOG4J2-1971>: ClassCastException:
org.eclipse.osgi.internal.loader.SystemBundleLoader$1 cannot be cast to java.lang.ClassLoader.
Thanks to liwenxian2017.
LOG4J2-1876 <https://issues.apache.org/jira/browse/LOG4J2-1876>: More reliable checking
for runtime dependencies.
LOG4J2-1867 <https://issues.apache.org/jira/browse/LOG4J2-1867>: Fix configuration documentation.
LOG4J2-1858 <https://issues.apache.org/jira/browse/LOG4J2-1858>: Ensure the ThreadLocal
StringBuilder in ParameterizedMessage won't hold excessively much memory after logging a long
LOG4J2-1885 <https://issues.apache.org/jira/browse/LOG4J2-1885>: Fix documentation about
default additivity value for loggers.
LOG4J2-1920 <https://issues.apache.org/jira/browse/LOG4J2-1920>: ScriptEngineManager
is not available in Android and causes a NoClassDefFoundError. Thanks to Ajitha.
LOG4J2-1989 <https://issues.apache.org/jira/browse/LOG4J2-1989>: Clarify Javadoc for
AbstractTriggeringPolicy. Thanks to Kenneth McFarland.
LOG4J2-1993 <https://issues.apache.org/jira/browse/LOG4J2-1993>: Fix compiler warnings
in LoggerConfigTest. Thanks to Kenneth McFarland.

LOG4J2-1928 <https://issues.apache.org/jira/browse/LOG4J2-1928>: Add support for DirectWriteRolloverStrategy
to RollingRandomAcessFileAppender.
LOG4J2-2022 <https://issues.apache.org/jira/browse/LOG4J2-2022>: RFC5424Layout now prints
the process id.
LOG4J2-2020 <https://issues.apache.org/jira/browse/LOG4J2-2020>: Remove default layout
from KafkaAppender.
LOG4J2-2023 <https://issues.apache.org/jira/browse/LOG4J2-2023>: Use a class' canonical
name instead of name to create its logger name.
LOG4J2-2015 <https://issues.apache.org/jira/browse/LOG4J2-2015>: Allow KeyStoreConfiguration
and TrustStoreConfiguration to find files as resources.
LOG4J2-2011 <https://issues.apache.org/jira/browse/LOG4J2-2011>: Replace JCommander
command line parser with picocli to let users run Log4j2 utility applications without requiring
an external dependency.
LOG4J2-1984 <https://issues.apache.org/jira/browse/LOG4J2-1984>: Allow maxLength of
StructuredData to be specified by the user.
LOG4J2-1071 <https://issues.apache.org/jira/browse/LOG4J2-1071>: Allow for bufferSize=0
in SMTP appender. Thanks to Ben Ludkiewicz, Benjamin Jaton.
LOG4J2-1261 <https://issues.apache.org/jira/browse/LOG4J2-1261>: Async Loggers no longer
use deprecated LMAX Disruptor APIs. (Disruptor-3.3.3 or higher is now required.)
LOG4J2-1908 <https://issues.apache.org/jira/browse/LOG4J2-1908>: Improved error message
when misconfigured with multiple incompatible appenders targeting same file.
LOG4J2-1954 <https://issues.apache.org/jira/browse/LOG4J2-1954>: Configurations with
multiple root loggers now fail loudly.
LOG4J2-1958 <https://issues.apache.org/jira/browse/LOG4J2-1958>: Deprecate SerializedLayout
and remove it as default.
LOG4J2-1959 <https://issues.apache.org/jira/browse/LOG4J2-1959>: Disable DTD processing
in XML configuration files.
LOG4J2-1950 <https://issues.apache.org/jira/browse/LOG4J2-1950>: Fix docker build with
jdk9 requirements (#84). Thanks to Pierrick HYMBERT.
LOG4J2-1801 <https://issues.apache.org/jira/browse/LOG4J2-1801>: Add more detail to
WARN "Ignoring log event" messages printed to the console after log4j was shut down.
LOG4J2-1926 <https://issues.apache.org/jira/browse/LOG4J2-1926>: Facilitate log4j use
in Android applications: remove dependency on RMI and Management APIs from log4j-api.
LOG4J2-1956 <https://issues.apache.org/jira/browse/LOG4J2-1956>: JMS Appender broker
password should be a char[], not a String.
LOG4J2-1917 <https://issues.apache.org/jira/browse/LOG4J2-1917>: Support using java.util.ServiceLoader
to locate Log4j 2 API providers.
LOG4J2-1966 <https://issues.apache.org/jira/browse/LOG4J2-1966>: Include separator option
of PatternLayout in manual (and other updates). Thanks to M Sazzadul Hoque.
LOG4J2-1851 <https://issues.apache.org/jira/browse/LOG4J2-1851>: Move server components
from log4j-core to new log4-server module.
LOG4J2-1991 <https://issues.apache.org/jira/browse/LOG4J2-1991>: Refactor SimpleMessage
to be concise and clear (#100) Thanks to .
LOG4J2-2017 <https://issues.apache.org/jira/browse/LOG4J2-2017>: Update Jackson from
2.8.9 to 2.9.0.
LOG4J2-1868 <https://issues.apache.org/jira/browse/LOG4J2-1868>: Update ZeroMQ's JeroMQ
from 0.3.6 to 0.4.0.
LOG4J2-1960 <https://issues.apache.org/jira/browse/LOG4J2-1960>: Update ZeroMQ's JeroMQ
from 0.4.0 to 0.4.1.
LOG4J2-1974 <https://issues.apache.org/jira/browse/LOG4J2-1974>: Update ZeroMQ's JeroMQ
from 0.4.1 to 0.4.2.
LOG4J2-1869 <https://issues.apache.org/jira/browse/LOG4J2-1869>: Update Kafka client
from to
LOG4J2-1962 <https://issues.apache.org/jira/browse/LOG4J2-1962>: Update Kafka client
from to
LOG4J2-1872 <https://issues.apache.org/jira/browse/LOG4J2-1872>: Update JavaMail from
1.5.5 to 1.5.6.
LOG4J2-1879 <https://issues.apache.org/jira/browse/LOG4J2-1879>: Update JAnsi from 1.14
to 1.15.
LOG4J2-1877 <https://issues.apache.org/jira/browse/LOG4J2-1877>: Missing documentation
for Max index limit in DefaultRolloverStrategy. Thanks to Chandra Tungathurthi.
LOG4J2-1899 <https://issues.apache.org/jira/browse/LOG4J2-1899>: Add missing getters
to classes in package org.apache.logging.log4j.core.net.ssl.
LOG4J2-1900 <https://issues.apache.org/jira/browse/LOG4J2-1900>: Update JAnsi from 1.15
to 1.16.
LOG4J2- <https://issues.apache.org/jira/browse/LOG4J2->: Update SLF4J from 1.7.24 to
LOG4J2-1938 <https://issues.apache.org/jira/browse/LOG4J2-1938>: Update Jackson from
2.8.7 to 2.8.9.
LOG4J2-1970 <https://issues.apache.org/jira/browse/LOG4J2-1970>: Update HdrHistogram
from 2.1.8 to 2.1.9.
LOG4J2-1975 <https://issues.apache.org/jira/browse/LOG4J2-1975>: Update javax.persistence
from 2.1.0 to 2.1.1.
LOG4J2-1976 <https://issues.apache.org/jira/browse/LOG4J2-1976>: Update org.osgi.core
from 4.3.1 to 6.0.0.
Apache Log4j 2.9.0 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:

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