////
    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, Version 2.0
    (the "License"); you may not use this file except in compliance with
    the License.  You may obtain a copy of the License at

         https://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
////

////
    ██     ██  █████  ██████  ███    ██ ██ ███    ██  ██████  ██
    ██     ██ ██   ██ ██   ██ ████   ██ ██ ████   ██ ██       ██
    ██  █  ██ ███████ ██████  ██ ██  ██ ██ ██ ██  ██ ██   ███ ██
    ██ ███ ██ ██   ██ ██   ██ ██  ██ ██ ██ ██  ██ ██ ██    ██
     ███ ███  ██   ██ ██   ██ ██   ████ ██ ██   ████  ██████  ██

    IF THIS FILE DOESN'T HAVE A `.ftl` SUFFIX, IT IS AUTO-GENERATED, DO NOT EDIT IT!

    Version-specific release notes (`7.8.0.adoc`, etc.) are generated from `src/changelog/*/.release-notes.adoc.ftl`.
    Auto-generation happens during `generate-sources` phase of Maven.
    Hence, you must always

    1. Find and edit the associated `.release-notes.adoc.ftl`
    2. Run `./mvnw generate-sources`
    3. Commit both `.release-notes.adoc.ftl` and the generated `7.8.0.adoc`
////

[#release-notes-2-8]
== 2.8

Release date:: 2017-01-21

This release contains several bugfixes and new features.
The new features include the ability to have the `RollingFileAppender` log directly to the archive files.
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:

[source,java]
----
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:

[source,java]
----
logger.error(“This is the log message”, throwable);
----

or

[source,java]
----
logger.error((Marker) null, “This is the log message”, throwable);
----

The Log4j 2.8 API, as well as many core components, maintains binary compatibility with previous releases.

Log4j 2.8 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 http://logging.apache.org/log4j/2.x/[the Apache Log4j 2 website].


=== Added

* Make DefaultRolloverStrategy more efficient when renaming files. Add nomax option to the fileIndex attribute. (https://issues.apache.org/jira/browse/LOG4J2-1032[LOG4J2-1032])
* RollingFileAppender now supports omitting the file name and writing directly to the archive files. (https://issues.apache.org/jira/browse/LOG4J2-1101[LOG4J2-1101])
* Allow default value in property to be a Lookup. (https://issues.apache.org/jira/browse/LOG4J2-1243[LOG4J2-1243])
* Add documentation regarding YAML configuration format. (https://issues.apache.org/jira/browse/LOG4J2-1379[LOG4J2-1379])
* Added public method ThreadContext::getThreadContextMap; removed class ThreadContextAccess. (https://issues.apache.org/jira/browse/LOG4J2-1660[LOG4J2-1660])
* Introduce interfaces IndexedStringMap and IndexedReadOnlyStringMap, supporting garbage-free iteration over sorted map. (https://issues.apache.org/jira/browse/LOG4J2-1681[LOG4J2-1681])
* Add a Builder to ScriptPatternSelector and deprecate ScriptPatternSelector.createSelector(). (https://issues.apache.org/jira/browse/LOG4J2-1695[LOG4J2-1695])
* Add a Builder to MarkerPatternSelector and deprecate MarkerPatternSelector.createSelector(). (https://issues.apache.org/jira/browse/LOG4J2-1696[LOG4J2-1696])
* Add a SerializerBuilder to PatternLayout and deprecate PatternLayout.createSerializer(). (https://issues.apache.org/jira/browse/LOG4J2-1697[LOG4J2-1697])
* Add a Builder to RandomAccessFileAppender and deprecate RandomAccessFileAppender.createAppender(). (https://issues.apache.org/jira/browse/LOG4J2-1701[LOG4J2-1701])
* Add a Builder to MemoryMappedFileAppender and deprecate MemoryMappedFileAppender.createAppender(). (https://issues.apache.org/jira/browse/LOG4J2-1703[LOG4J2-1703])
* Add a Builder to RollingRandomAccessFileAppender and deprecate RollingRandomAccessFileAppender.createAppender(). (https://issues.apache.org/jira/browse/LOG4J2-1704[LOG4J2-1704])
* Allow TCP Socket Appender to set socket options. (https://issues.apache.org/jira/browse/LOG4J2-1707[LOG4J2-1707])
* Allow Secure Socket Appender to set socket options. (https://issues.apache.org/jira/browse/LOG4J2-1708[LOG4J2-1708])
* Add a Builder to SyslogAppender and deprecate SyslogAppender.createAppender(). (https://issues.apache.org/jira/browse/LOG4J2-1709[LOG4J2-1709])
* Introduce marker interface AsynchronouslyFormattable. (https://issues.apache.org/jira/browse/LOG4J2-1718[LOG4J2-1718])
* Add Apache Cassandra appender and ColumnMapping plugin. (https://issues.apache.org/jira/browse/LOG4J2-1730[LOG4J2-1730])
* Add SyncSend attribute to KafkaAppender (as in KafkaLog4jAppender). (https://issues.apache.org/jira/browse/LOG4J2-1733[LOG4J2-1733])
* Add a Builder to SyslogLayout and deprecate SyslogLayout.createLayout(Facility, boolean, String, Charset). (https://issues.apache.org/jira/browse/LOG4J2-1737[LOG4J2-1737])
* Add a Builder to JsonLayout and deprecate org.apache.logging.log4j.core.layout.JsonLayout.createLayout(Configuration, boolean, boolean, boolean, boolean, boolean, boolean, String, String, Charset, boolean). (https://issues.apache.org/jira/browse/LOG4J2-1738[LOG4J2-1738])
* Add Builder to KafkaAppender and deprecate KafkaAppender.createAppender(Layout, Filter, String, boolean, String, Property[], Configuration). (https://issues.apache.org/jira/browse/LOG4J2-1739[LOG4J2-1739])
* Add TypeConverter and constraint validators for java.net.InetAddress and port numbers. (https://issues.apache.org/jira/browse/LOG4J2-1755[LOG4J2-1755])
* Add TypeConverter for java.nio.file.Path. (https://issues.apache.org/jira/browse/LOG4J2-1758[LOG4J2-1758])
* Add TypeConverter for java.util.UUID. (https://issues.apache.org/jira/browse/LOG4J2-1759[LOG4J2-1759])
* Use MethodHandle in ContextDataFactory cached constructor. (https://issues.apache.org/jira/browse/LOG4J2-1764[LOG4J2-1764])
* Add a Builder to JdbcAppender and deprecate JdbcAppender.createAppender(). (https://issues.apache.org/jira/browse/LOG4J2-1770[LOG4J2-1770])
* Add a Builder to ColumnConfig and deprecate ColumnConfig.createColumnConfig(). (https://issues.apache.org/jira/browse/LOG4J2-1771[LOG4J2-1771])
* Add StatusLoggerRule to allow unit tests to set a status level. (https://issues.apache.org/jira/browse/LOG4J2-1773[LOG4J2-1773])
* Document how to exclude transitive conflicting dependencies in Maven and Gradle. (https://issues.apache.org/jira/browse/LOG4J2-1787[LOG4J2-1787])
* Add non-string data type support to JdbcAppender via new ColumnMapping plugin. (https://issues.apache.org/jira/browse/LOG4J2-424[LOG4J2-424])
* Refactor SyslogAppender so that Layout is a Plugin element. (https://issues.apache.org/jira/browse/LOG4J2-969[LOG4J2-969])

=== Changed

* The log4j-slf4j-impl module now declares a runtime dependency on log4j-core. While not technically required, this makes the log4j-slf4j-impl module behave similarly to slf4j-log4j12, and facilitates migration to Log4j 2. (https://issues.apache.org/jira/browse/LOG4J2-1302[LOG4J2-1302])
* Update JeroMQ from 0.3.5 to 0.3.6. (https://issues.apache.org/jira/browse/LOG4J2-1641[LOG4J2-1641])
* Inefficient locking in AbstractLoggerAdapter. (https://issues.apache.org/jira/browse/LOG4J2-1644[LOG4J2-1644])
* Migrate to Mockito 2.x in unit tests. (https://issues.apache.org/jira/browse/LOG4J2-1646[LOG4J2-1646])
* Update Commons Lang from 3.4 to 3.5. (https://issues.apache.org/jira/browse/LOG4J2-1647[LOG4J2-1647])
* Update Jackson from 2.8.3 to 2.8.4. (https://issues.apache.org/jira/browse/LOG4J2-1655[LOG4J2-1655])
* Update Apache Flume from 1.6.0 to 1.7.0. (https://issues.apache.org/jira/browse/LOG4J2-1656[LOG4J2-1656])
* Update LMAX Disruptor from 3.3.5 to 3.3.6. (https://issues.apache.org/jira/browse/LOG4J2-1698[LOG4J2-1698])
* Update Jansi from 1.13 to 1.14. (https://issues.apache.org/jira/browse/LOG4J2-1700[LOG4J2-1700])
* Update Jackson from 2.8.4 to 2.8.5. (https://issues.apache.org/jira/browse/LOG4J2-1735[LOG4J2-1735])
* Update Kafka from 0.10.0.1 to 0.10.1.1. (https://issues.apache.org/jira/browse/LOG4J2-1750[LOG4J2-1750])
* Update liquibase-core from 3.5.1 to 3.5.3. (https://issues.apache.org/jira/browse/LOG4J2-1751[LOG4J2-1751])
* Replace MockEJB dependency in unit tests with Spring Test and Mockito. (https://issues.apache.org/jira/browse/LOG4J2-1774[LOG4J2-1774])
* Update Conversant Disruptor from 1.2.7 to 1.2.10 (https://issues.apache.org/jira/browse/LOG4J2-1781[LOG4J2-1781])

=== Fixed

* Improve LogEvent serialization to handle non-serializable Messages and deserializing when required classes are missing. (https://issues.apache.org/jira/browse/LOG4J2-1226[LOG4J2-1226])
* CronTriggeringPolicy raise exception and fail to rollover log file when evaluateOnStartup is true. (https://issues.apache.org/jira/browse/LOG4J2-1474[LOG4J2-1474])
* Configurable JVM shutdown hook timeout. (https://issues.apache.org/jira/browse/LOG4J2-1623[LOG4J2-1623])
* Fixed file locking regression in FileAppender introduced in 2.6. (https://issues.apache.org/jira/browse/LOG4J2-1628[LOG4J2-1628])
* Console Appender does not pick up Oracle Java 8's sun.stdout.encoding and sun.stderr.encoding. (https://issues.apache.org/jira/browse/LOG4J2-1636[LOG4J2-1636])
* Fixed problems when used in OSGi containers (IllegalAccessError, NoClassDefFoundError). (https://issues.apache.org/jira/browse/LOG4J2-1637[LOG4J2-1637])
* Fix MemoryMappedFileAppender.createAppender() Javadoc for immediateFlush. (https://issues.apache.org/jira/browse/LOG4J2-1639[LOG4J2-1639])
* DefaultShutdownCallbackRegistry can throw a NoClassDefFoundError. (https://issues.apache.org/jira/browse/LOG4J2-1642[LOG4J2-1642])
* Immutable empty StringMap. (https://issues.apache.org/jira/browse/LOG4J2-1645[LOG4J2-1645])
* Insure the ConfigurationScheduler shuts down without blocking. (https://issues.apache.org/jira/browse/LOG4J2-1649[LOG4J2-1649])
* CronTriggeringPolicy would use the wrong date/time when rolling over and create multiple triggering policies on reconfiguration. (https://issues.apache.org/jira/browse/LOG4J2-1653[LOG4J2-1653])
* Prevent NPE in ThreadContextMapFactory::createThreadContextMap when initializing Log4j with Configurator::initialize and the BasicContextSelector is used. (https://issues.apache.org/jira/browse/LOG4J2-1658[LOG4J2-1658])
* Ensure SortedArrayStringMap can be serialized and deserialized without errors regardless of content. (https://issues.apache.org/jira/browse/LOG4J2-1663[LOG4J2-1663])
* Improve OSGi unit tests. (https://issues.apache.org/jira/browse/LOG4J2-1664[LOG4J2-1664])
* (GC) Avoid allocating temporary objects in IntegerPatternConverter. (https://issues.apache.org/jira/browse/LOG4J2-1665[LOG4J2-1665])
* (GC) Avoid allocating temporary objects in RelativeTimePatternConverter. (https://issues.apache.org/jira/browse/LOG4J2-1666[LOG4J2-1666])
* (GC) Avoid allocating temporary objects in SequenceNumberPatternConverter. (https://issues.apache.org/jira/browse/LOG4J2-1667[LOG4J2-1667])
* (GC) Avoid allocating temporary objects in MarkerPatternConverter. (https://issues.apache.org/jira/browse/LOG4J2-1668[LOG4J2-1668])
* (GC) Avoid allocating temporary objects in MaxLengthConverter. (https://issues.apache.org/jira/browse/LOG4J2-1669[LOG4J2-1669])
* (GC) Avoid allocating temporary objects in EqualsReplacementConverter. (https://issues.apache.org/jira/browse/LOG4J2-1670[LOG4J2-1670])
* (GC) Avoid allocating temporary objects in EqualsIgnoreCaseReplacementConverter. (https://issues.apache.org/jira/browse/LOG4J2-1671[LOG4J2-1671])
* (GC) Avoid allocating temporary objects in LevelRangeFilter. (https://issues.apache.org/jira/browse/LOG4J2-1672[LOG4J2-1672])
* (GC) Avoid allocating temporary objects in MarkerFilter. (https://issues.apache.org/jira/browse/LOG4J2-1673[LOG4J2-1673])
* (GC) Avoid allocating temporary objects in ThresholdFilter. (https://issues.apache.org/jira/browse/LOG4J2-1674[LOG4J2-1674])
* Some LogEvents may not carry a Throwable (Use Message.getThrowable() in log(Message) methods.) (https://issues.apache.org/jira/browse/LOG4J2-1676[LOG4J2-1676])
* (GC) Avoid allocating temporary objects in MapFilter. (https://issues.apache.org/jira/browse/LOG4J2-1677[LOG4J2-1677])
* (GC) Avoid allocating temporary objects in ThreadContextMapFilter. (https://issues.apache.org/jira/browse/LOG4J2-1678[LOG4J2-1678])
* (GC) Avoid allocating temporary objects in StructuredDataFilter. (https://issues.apache.org/jira/browse/LOG4J2-1679[LOG4J2-1679])
* (GC) Avoid allocating temporary objects in TimeFilter. (https://issues.apache.org/jira/browse/LOG4J2-1680[LOG4J2-1680])
* Logger using LocalizedMessageFactory prints key instead of message. (https://issues.apache.org/jira/browse/LOG4J2-1682[LOG4J2-1682])
* (GC) Avoid allocating temporary objects in MapMessage. (https://issues.apache.org/jira/browse/LOG4J2-1683[LOG4J2-1683])
* Option 'disableAnsi' in PatternLayout to unconditionally disable ANSI escape codes. (https://issues.apache.org/jira/browse/LOG4J2-1685[LOG4J2-1685])
* NPE in ThrowableProxy when resolving stack in Java EE/OSGi environment. (https://issues.apache.org/jira/browse/LOG4J2-1687[LOG4J2-1687])
* Fixed bug where elements of a log message parameter array were nulled out in garbage-free mode. (https://issues.apache.org/jira/browse/LOG4J2-1688[LOG4J2-1688])
* Add CleanableThreadContextMap interface supporting method removeAll(Iterable<String>). (https://issues.apache.org/jira/browse/LOG4J2-1689[LOG4J2-1689])
* Add putAll() method to CloseableThreadContext. (https://issues.apache.org/jira/browse/LOG4J2-1692[LOG4J2-1692])
* Make TimeFilter usable as global filter and as logger filter. (https://issues.apache.org/jira/browse/LOG4J2-1706[LOG4J2-1706])
* Pick up bug fixes from Apache Commons Lang's org.apache.commons.lang3.time package. (https://issues.apache.org/jira/browse/LOG4J2-1712[LOG4J2-1712])
* (GC) Avoid allocating temporary objects in AbstractStyleNameConverter. (https://issues.apache.org/jira/browse/LOG4J2-1714[LOG4J2-1714])
* (GC) Avoid allocating temporary objects in NdcPatternConverter. (Note that use of the ThreadContext stack is not garbage-free.) (https://issues.apache.org/jira/browse/LOG4J2-1715[LOG4J2-1715])
* (GC) Avoid allocating temporary objects in MapPatternConverter. (Note that constructing a MapMessage is not garbage-free.) (https://issues.apache.org/jira/browse/LOG4J2-1716[LOG4J2-1716])
* (GC) Avoid allocating temporary objects in EncodingPatternConverter. (https://issues.apache.org/jira/browse/LOG4J2-1717[LOG4J2-1717])
* Fixed race condition in ObjectMessage and SimpleMessage, ensuring that the log message contains the value the object has during the logging call. (https://issues.apache.org/jira/browse/LOG4J2-1719[LOG4J2-1719])
* Make GelfLayout independent of Jackson. (https://issues.apache.org/jira/browse/LOG4J2-1720[LOG4J2-1720])
* (GC) Avoid allocating temporary objects in VariablesNotEmptyReplacementConverter. (https://issues.apache.org/jira/browse/LOG4J2-1722[LOG4J2-1722])
* Unwanted transitive dependency on geronimo-jms_1.1_spec causes OSGi tests to fail. (https://issues.apache.org/jira/browse/LOG4J2-1723[LOG4J2-1723])
* Using variables in GelfLayout's additional fields at runtime. (https://issues.apache.org/jira/browse/LOG4J2-1724[LOG4J2-1724])
* SslSocketManager now respects connectTimeoutMillis. (https://issues.apache.org/jira/browse/LOG4J2-1731[LOG4J2-1731])
* SslSocketManagerFactory might leak Sockets when certain startup errors occur. (https://issues.apache.org/jira/browse/LOG4J2-1734[LOG4J2-1734])
* TcpSocketManagerFactory might leak Sockets when certain startup errors occur. (https://issues.apache.org/jira/browse/LOG4J2-1736[LOG4J2-1736])
* Add CronTriggeringPolicy programmatically leads to NPE. (https://issues.apache.org/jira/browse/LOG4J2-1740[LOG4J2-1740])
* CompositeConfiguration does not add filters to appenderRefs. (https://issues.apache.org/jira/browse/LOG4J2-1743[LOG4J2-1743])
* The custom logger Generate tool no longer requires the log4j-api module on the classpath. (https://issues.apache.org/jira/browse/LOG4J2-1744[LOG4J2-1744])
* Do not use non-daemon thread pool for rollover tasks. (https://issues.apache.org/jira/browse/LOG4J2-1748[LOG4J2-1748])
* Adds xmlns in schema and some other tags. (https://issues.apache.org/jira/browse/LOG4J2-1756[LOG4J2-1756])
* Add Builder to GelfLayout. (https://issues.apache.org/jira/browse/LOG4J2-1762[LOG4J2-1762])
* Fixed concurrency issue affecting all layouts except PatternLayout and GelfLayout, which caused scrambled output and exceptions when logging synchronously from multiple threads. (https://issues.apache.org/jira/browse/LOG4J2-1769[LOG4J2-1769])
* Fixed bug where AsyncLogger did not resolve configuration properties. (https://issues.apache.org/jira/browse/LOG4J2-1779[LOG4J2-1779])
* Eliminate the use of the ExecutorServices in the LoggerContext. (https://issues.apache.org/jira/browse/LOG4J2-1780[LOG4J2-1780])
* ConfigurationScheduler now preserves interrupt flag during stop. (https://issues.apache.org/jira/browse/LOG4J2-1786[LOG4J2-1786])
* Cannot define both `filters` and `separator` for PatternLayout %xEx. (https://issues.apache.org/jira/browse/LOG4J2-2195[LOG4J2-2195])
* RootThrowablePatternConverter does not use TextRenderer or line separator options. (https://issues.apache.org/jira/browse/LOG4J2-2221[LOG4J2-2221])
