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| Apache Log4j 2.4 RELEASE NOTES |
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| The Apache Log4j 2 team is pleased to announce the Log4j 2.4 release! |
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| 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, property substitution using Lookups, and asynchronous |
| Loggers. In addition, Log4j 2 will not lose events while reconfiguring. |
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| This is the eighth GA release. It contains several bugfixes and new features. As of this release |
| Log4j now requires a minimum of Java 7. |
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| GA Release 2.4 |
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| Changes in this version include: |
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| New features: |
| o LOG4J2-635: Add support for configuration via Properties. |
| o LOG4J2-952: Add ConfigurationBuilder. |
| o LOG4J2-599: Added support for Java 8 lambda expressions to lazily construct a log message only if |
| the requested log level is enabled. |
| o LOG4J2-1118: Updated Logger wrapper generator tool to add Java 8 lambda support for custom log levels. |
| o LOG4J2-1107: New Appender for Apache Kafka. Thanks to Mikael Ståldal. |
| o LOG4J2-1113: New publisher Appender for ZeroMQ (using JeroMQ). Thanks to Gary Gregory. |
| o LOG4J2-1088: Add Comma Separated Value (CSV) layouts for parameter and event logging. Thanks to Gary Gregory. |
| o LOG4J2-1090: Add Core Configurator APIs to change a logger's level. |
| o LOG4J2-1105: Add API org.apache.logging.log4j.Level.isInRange(Level, Level). Thanks to Gary Gregory. |
| o LOG4J2-1106: Add a LevelRangeFilter class. Thanks to Gary Gregory. |
| o LOG4J2-1076: Added support for system nanosecond time in pattern layout. |
| o LOG4J2-1075: Added support for compressing to bzip2 format on file rollover. |
| o LOG4J2-1077: Support additional Apache Commons Compress compression formats on rollover: Deflate, Pack200, XY. |
| o LOG4J2-767: New module for Liquibase integration. Thanks to Mikael Ståldal. |
| o LOG4J2-1023: New RewritePolicy for changing level of a log event. Thanks to Mikael Ståldal. |
| o LOG4J2-1015: Add a way to route messages based on the %marker in Layout for RoutingAppender. Thanks to Daniel Marcotte. |
| o LOG4J2-1050: Add a Log4jLookup class to help write log files relative to log4j2.xml. Thanks to Adam Retter. |
| o LOG4J2-1057: Add API org.apache.logging.log4j.LogManager.getFormatterLogger(). |
| o LOG4J2-1066: Expose Log4jContextFactory's ShutdownCallbackRegistry. Thanks to Charles Allen. |
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| Fixed Bugs: |
| o LOG4J2-1121: Fixed potential race condition on reconfiguration. Introduced ReliabilityStrategy to facilitate |
| switching between different mechanisms for preventing log events from being dropped on reconfiguration. |
| o LOG4J2-1123: Core Configurator.initialize(String, ClassLoader, String) fails to work when config location is a file path. Thanks to Gary Gregory. |
| o LOG4J2-1117: OutputStreamManager in ConsoleAppender leaking managers. Thanks to Marcus Thiesen. |
| o LOG4J2-1044: Write pending events to Flume when the appender is stopped. |
| o LOG4J2-1108: NullPointerException when passing null to java.util.logging.Logger.setLevel(). Thanks to Mikael Ståldal. |
| o LOG4J2-1110: org.apache.logging.log4j.jul.CoreLogger.setLevel() checks for security permission too late. |
| o LOG4J2-1084: Misleading StatusLogger WARN event in LogManager with java.util.Map. Thanks to Philipp Schneider. |
| o LOG4J2-1051: NoClassDefFoundError when starting app on Google App Engine. Thanks to Lukasz Lenart. |
| o LOG4J2-684: ExtendedThrowablePatternConverter does not print suppressed exceptions. Thanks to Joern Huxhorn, Mauro Molinari. |
| o LOG4J2-1069: Improper handling of JSON escape chars when deserializing JSON log events. Thanks to Sam Braam. |
| o LOG4J2-1068: Exceptions not logged when using TcpSocketServer + SerializedLayout. Thanks to Andy McMullan. |
| o LOG4J2-1067: ThrowableProxy getExtendedStackTraceAsString throws NPE on deserialized nested exceptions. Thanks to Sam Braam. |
| o LOG4J2-1049: AsyncAppender now resets the thread interrupted flag after catching InterruptedException. Thanks to Robert Schaft. |
| o LOG4J2-1048: FileConfigurationMonitor unnecessarily calls System.currentTimeMillis() causing high CPU usage. Thanks to Nikhil. |
| o LOG4J2-1037: Backward compatibility issue in log4j-1.2-api NDC pop() and peek(). Thanks to Marc Dergacz. |
| o LOG4J2-1025: Custom java.util.logging.Level gives null Log4j Level and causes NPE. Thanks to Mikael Ståldal. |
| o LOG4J2-1033: SimpleLogger creates unnecessary Map objects by calling ThreadContext.getContext() instead of getImmutableContext(). Thanks to Mikael Ståldal. |
| o LOG4J2-1026: HighlightConverter does not obey noConsoleNoAnsi. |
| o LOG4J2-1019: ZipCompressAction leaves files open until GC when an IO error takes place. |
| o LOG4J2-1020: GzCompressAction leaves files open until GC when an IO error takes place. |
| o LOG4J2-1038: Incorrect documentation for layout default charset. Thanks to Gili. |
| o LOG4J2-1042: Socket and Syslog appenders don't take timeout into account at startup. Thanks to Guillaume Turri. |
| o LOG4J2-934: Circular suppressed Exception throws StackOverflowError. Thanks to Kenneth Gendron. |
| o LOG4J2-1046: Circular Exception cause throws StackOverflowError. Thanks to Kenneth Gendron. |
| o LOG4J2-982: Use System.nanoTime() to measure time intervals. Thanks to Mikhail Mazurskiy. |
| o LOG4J2-1045: Externalize log4j2.xml via URL resource. Thanks to Günter Albrecht. |
| o LOG4J2-1058: Log4jMarker#contains(String) does not respect org.slf4j.Marker contract. Thanks to Daniel Branzea. |
| o LOG4J2-1060: Log4jMarker#contains(Marker) does not respect org.slf4j.Marker contract. |
| o LOG4J2-1061: Log4jMarker#remove(Marker) does not respect org.slf4j.Marker contract. |
| o LOG4J2-1062: Log4jMarker#add(Marker) does not respect org.slf4j.Marker contract. |
| o LOG4J2-1064: org.apache.logging.slf4j.Log4jMarker does not implement org.slf4j.Marker.equals(Object) org.slf4j.Marker.hashCode(). |
| o LOG4J2-889: Header in layout should not be written on application startup if appending to an existing file. Fixes LOG4J2-1030. Thanks to Maciej Karaś, Kenneth Leider. |
| o LOG4J2-918: Clarify documentation for combining async with sync loggers. |
| o LOG4J2-1078: GelfLayout throws exception if some log event fields are null. Thanks to Mikael Ståldal. |
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| Changes: |
| o LOG4J2-1017: Update Java platform from Java 6 to 7. From this version onwards, log4j 2 requires Java 7. |
| o LOG4J2-812: PatternLayout timestamp formatting performance improvement: replaced synchronized SimpleDateFormat with |
| Apache Commons FastDateFormat. This and better caching resulted in a ~3-30X faster timestamp formatting. |
| o LOG4J2-1097: PatternLayout timestamp formatting performance improvement: predefined date formats (and variants using |
| a period '.' millisecond separator instead of ',') are now formatted ~2-10X faster than other date formats. |
| o LOG4J2-1096: Improved performance of ParameterizedMessage::getFormattedMessage by ~2X. |
| o LOG4J2-1120: LoggerConfig performance improvements: avoid unnecessary lock acquisition, use more efficient data structure. |
| o LOG4J2-1125: PatternLayout performance improvement by caching and reusing a ThreadLocal StringBuilder. |
| o LOG4J2-1114: Add thread name to status logger layout. |
| o LOG4J2-1010: Pass log event when interpolating logger properties. |
| o LOG4J2-1044: Support batchSize in FlumeAvroManager. |
| o LOG4J2-1065: Define org.apache.logging.log4j.Marker.equals(Object) and org.apache.logging.log4j.Marker.hashCode(). |
| o LOG4J2-1063: Avoid creating temporary array object in org.apache.logging.slf4j.Log4jMarker.iterator(). |
| o LOG4J2-890: log4j-web-2.1 should workaround a bug in JBOSS EAP 6.2. Thanks to Hassan Kalaldeh, Robert Andersson, Remko Popma. |
| o LOG4J2-403: MongoDB appender, username and password should be optional. Thanks to Poorna Subhash P, Jeremy Lautman. |
| o LOG4J2-1035: Log4j2 tries to SystemClassLoader when running on Google AppEngine. |
| o LOG4J2-1022: Allow a list of keys to be specified in the MDC pattern converter. |
| o LOG4J2-959: Fix FindBugs DM_DEFAULT_ENCODING bug in SimpleLogger.logMessage() and simplify code. |
| o LOG4J2-1036: Update Apache Flume from 1.5.2 to 1.6.0. |
| o LOG4J2-1041: Update MongoDB driver from 2.11.2 to 2.13.2. |
| o LOG4J2-1018: Update database tests from H2 1.3.175 to 1.3.176. |
| o LOG4J2-1070: Update Java Mail from 1.5.2 to 1.5.4. |
| o LOG4J2-1079: Update Jackson from 2.5.3 to 2.5.4. |
| o LOG4J2-1879: Update Jackson from 2.5.4 to 2.6.0. |
| o LOG4J2-1092: Update Jackson from 2.6.0 to 2.6.1. |
| o LOG4J2-1104: Update Apache Commons Compress from 1.9 to 1.10. |
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| Removed: |
| o Removed experimental interface LevelLogger which got committed to master by mistake. |
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| Apache Log4j 2.4 requires a minimum of Java 7 to build and run. Log4j 2.4 and greater requires Java 7, |
| version 2.3 required Java 6. |
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| 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. |
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| 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: |
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| http://logging.apache.org/log4j/2.x/ |