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[#release-notes-2-14-1]
== 2.14.1

Release date:: 2021-03-06

This release contains a number of bug fixes and minor enhancements which are
listed below.

Due to a break in compatibility in the SLF4J binding, Log4j now ships with two versions of the SLF4J to Log4j adapters.
`log4j-slf4j-impl` should be used with SLF4J 1.7.x and earlier and `log4j-slf4j18-impl` should be used with SLF4J 1.8.x and later.

The Log4j 2.14.1 API, as well as many core components, maintains binary compatibility with previous releases.

Log4j 2.14.1 requires a minimum of Java 8 to build and run.
Log4j 2.12.1 is the last release to support Java 7.

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

* Enrich "map" resolver by unifying its backend with "mdc" resolver. (https://issues.apache.org/jira/browse/LOG4J2-2962[LOG4J2-2962])
* Support stack trace truncation in JsonTemplateLayout. (https://issues.apache.org/jira/browse/LOG4J2-2993[LOG4J2-2993])
* Replace JsonTemplateLayout resolver configurations table in docs with sections. (https://issues.apache.org/jira/browse/LOG4J2-2999[LOG4J2-2999])

=== Changed

* Allow reconfiguration when Log4j 1 configuration files are updated. (https://issues.apache.org/jira/browse/LOG4J2-2893[LOG4J2-2893])
* Add Rollover Listener to aid in unit test validation. (https://issues.apache.org/jira/browse/LOG4J2-2923[LOG4J2-2923])
* Replace outdated PatternLayout.createLayout() calls in docs with createDefaultLayout(). (https://issues.apache.org/jira/browse/LOG4J2-2977[LOG4J2-2977])
* Update JSON Unit 2.21.0 -> 2.22.0.
* Update JaCoCo 0.8.3 -> 0.8.6.
* Update Mockito 3.6.0 -> 3.7.0.
* Update MongoDB 3 plugin: org.mongodb:mongodb-driver 3.12.6 -> 3.12.7.
* Update MongoDB 4 plugin: org.mongodb:* 4.1.0 -> 4.1.1.
* Update Spring dependencies to 5.3.2, Spring Boot to 2.3.6, and Spring Cloud to Hoxton.SR9
* Update Woodstox 5.0.3 -> 6.2.3 to match Jackson 2.12.1.
* Update XML Unit 2.8.0 -> 2.8.2.
* Update com.fasterxml.jackson.*:* 2.11.2 - 2.11.3.
* Update commons-codec:commons-codec 1.14 -> 1.15.
* Update commons-io:commons-io 2.7 -> 2.8.0.
* Update de.flapdoodle.embed:de.flapdoodle.embed.mongo 2.2.0 -> 3.0.0.
* Update junit:junit 4.13 -> 4.13.1.
* Update mongodb4.version 4.1.1 -> 4.2.0.
* Update net.javacrumbs.json-unit:json-unit 1.31.1 -> 2.22.0.
* Update net.javacrumbs.json-unit:json-unit 2.22.0 -> 2.23.0.
* Update org.apache.activemq:* 5.16.0 -> 5.16.1.
* Update org.apache.commons:commons-dbcp2 2.4.0 -> 2.8.0.
* Update org.apache.commons:commons-lang3 3.10 -> 3.11.
* Update org.apache.commons:commons-pool2 2.8.1 -> 2.9.0.
* Update org.assertj:assertj-core 3.14.0 -> 3.18.1.
* Update org.assertj:assertj-core 3.18.1 -> 3.19.0.
* Update org.awaitility:awaitility 4.0.2 -> 4.0.3.
* Update org.codehaus.groovy:* 3.0.5 -> 3.0.6.
* Update org.codehaus.plexus:plexus-utils 3.2.0 -> 3.3.0.
* Update org.eclipse.tycho:org.eclipse.osgi 3.12.1.v20170821-1548 -> 3.13.0.v20180226-1711.
* Update org.fusesource.jansi:jansi 1.17.1 -> 2.0.1.
* Update org.fusesource.jansi:jansi 1.18 -> 2.2.0.
* Update org.fusesource.jansi:jansi 1.18 -> 2.3.1.
* Update org.mockito:mockito-* 3.7.0 -> 3.7.7.
* Update org.springframework:* 5.2.8.RELEASE -> 5.3.1.
* Update org.springframework:* 5.3.2 -> 5.3.3.
* Update org.xmlunit:* 2.7.0 -> 2.8.0.
* - com.fasterxml.jackson.core:jackson-annotations ................. 2.12.1 -> 2.12.2 - com.fasterxml.jackson.core:jackson-core ........................ 2.12.1 -> 2.12.2 - com.fasterxml.jackson.core:jackson-databind .................... 2.12.1 -> 2.12.2 - com.fasterxml.jackson.dataformat:jackson-dataformat-xml ........ 2.12.1 -> 2.12.2 - com.fasterxml.jackson.dataformat:jackson-dataformat-yaml ....... 2.12.1 -> 2.12.2 - com.fasterxml.jackson.module:jackson-module-jaxb-annotations ... 2.12.1 -> 2.12.2 - org.apache.commons:commons-lang3 ............................... 3.11 -> 3.12.0 - org.junit.jupiter:junit-jupiter-engine ......................... 5.7.0 -> 5.7.1 - org.junit.jupiter:junit-jupiter-migrationsupport ............... 5.7.0 -> 5.7.1 - org.junit.jupiter:junit-jupiter-params ......................... 5.7.0 -> 5.7.1 - org.junit.vintage:junit-vintage-engine ......................... 5.7.0 -> 5.7.1 - org.mockito:mockito-core ....................................... 3.7.7 -> 3.8.0 - org.mockito:mockito-junit-jupiter .............................. 3.7.7 -> 3.8.0 - org.mongodb:bson ............................................... 4.2.0 -> 4.2.2 - org.mongodb:mongodb-driver-sync ................................ 4.2.0 -> 4.2.2

=== Fixed

* Allow auto-shutdown of log4j in log4j-web to be turned off and provide a ServletContextListener "Log4jShutdownOnContextDestroyedListener" to stop log4j. Register the listener at the top of web.xml to ensure the shutdown happens last. (https://issues.apache.org/jira/browse/LOG4J2-1606[LOG4J2-1606])
* Allow auto-shutdown of log4j in log4j-web to be turned off and provide a ServletContextListener "Log4jShutdownOnContextDestroyedListener" to stop log4j. Register the listener at the top of web.xml to ensure the shutdown happens last. (https://issues.apache.org/jira/browse/LOG4J2-2624[LOG4J2-2624])
* Avoid redundant Kafka producer instantiation causing thread leaks. (https://issues.apache.org/jira/browse/LOG4J2-2916[LOG4J2-2916])
* Document that LogBuilder default methods do nothing. (https://issues.apache.org/jira/browse/LOG4J2-2947[LOG4J2-2947])
* Replace HashSet with IdentityHashMap in ParameterFormatter to detect cycles. (https://issues.apache.org/jira/browse/LOG4J2-2948[LOG4J2-2948])
* Fix reading of JsonTemplateLayout event additional fields from config. (https://issues.apache.org/jira/browse/LOG4J2-2961[LOG4J2-2961])
* Merge packages from several Configurations in Composite Configuration. (https://issues.apache.org/jira/browse/LOG4J2-2964[LOG4J2-2964])
* Fix JsonTemplateLayout index based parameter resolution when messages contain too few parameters. (https://issues.apache.org/jira/browse/LOG4J2-2967[LOG4J2-2967])
* Refactor AsyncAppender and AppenderControl for handling of Throwables. (https://issues.apache.org/jira/browse/LOG4J2-2972[LOG4J2-2972])
* Rename EventTemplateAdditionalField#type (conflicting with properties file parser) to "format". (https://issues.apache.org/jira/browse/LOG4J2-2973[LOG4J2-2973])
* Log4j would fail to initialize in Java 8 with log4j-spring-boot. (https://issues.apache.org/jira/browse/LOG4J2-2974[LOG4J2-2974])
* JdbcAppender composes an incorrect INSERT statement without a ColumnMapping element. (https://issues.apache.org/jira/browse/LOG4J2-2976[LOG4J2-2976])
* OnStartupTriggeringPolicy would fail to cause the file to roll over with DirectWriteTriggeringPolicy unless minSize was set to 0. (https://issues.apache.org/jira/browse/LOG4J2-2981[LOG4J2-2981])
* Add eventTemplateRootObjectKey parameter to JsonTemplateLayout. (https://issues.apache.org/jira/browse/LOG4J2-2985[LOG4J2-2985])
* Reduce garbage by using putAll when copying the ThreadContext for SLF4J. (https://issues.apache.org/jira/browse/LOG4J2-2990[LOG4J2-2990])
* Fix truncation of excessive strings ending with a high surrogate in JsonWriter. (https://issues.apache.org/jira/browse/LOG4J2-2998[LOG4J2-2998])
* Directly create a thread instead of using the common ForkJoin pool when initializing ThreadContextDataInjector" (https://issues.apache.org/jira/browse/LOG4J2-3006[LOG4J2-3006])
* Log4j1ConfigurationConverter on Windows produces " " at end of every line. (https://issues.apache.org/jira/browse/LOG4J2-3014[LOG4J2-3014])
* OutputStreamManager.flushBuffer always resets the buffer, previously the buffer was not reset after an exception. (https://issues.apache.org/jira/browse/LOG4J2-3028[LOG4J2-3028])
* Add log method with no parameters - i.e. it has an empty message. (https://issues.apache.org/jira/browse/LOG4J2-3033[LOG4J2-3033])
* Attempting to call getExtendedStackTraceAsString() after deserializing JSON LogEvent results in a NPE. (https://issues.apache.org/jira/browse/LOG4J2-3131[LOG4J2-3131])
* NoGcLayout allocates empty bytes arrays for its header and footer. (https://issues.apache.org/jira/browse/LOG4J2-3131[LOG4J2-3131])
