Apache Log4j 2.2 发布，Java 日志组件

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3月21日 深圳 OSC 源创会开始报名罗，送华为海思开发板
　　Apache Log4j 2.2 发布，此版本是第五个 GA 版本，包括一些 bug 修复和新特性。
　　
　　新特性：
　　o LOG4J2-941:? Allow JSON layout to create one compact log record per line. Thanks to Konstantinos
　　Liakos.
　　o LOG4J2-933:? HTML layout should not use attribute minimalization for hr noshade. Thanks
　　to ppiman at gmail.com .
　　o LOG4J2-895:? Specify the SyslogAppender connect timeout value as part of the configuration.
　　The SyslogAppender takes a new parameter connectTimeoutMillis.
　　o LOG4J2-899:? Specify the SocketAppender connect timeout value as part of the configuration.
　　The SyslogAppender takes a new parameter connectTimeoutMillis.
　　
　　Bugs 修复：
　　o LOG4J2-938:? (JMX) To avoid memory leaks when web applications are restarted, JMX notifications
　　are sent from
　　the caller thread in web applications. For non-web applications notifications are
　　sent from a background thread
　　as before. Thanks to Mauro Molinari.
　　o LOG4J2-957:? Missing toUpperCase("Locale.ENGLISH"). Thanks to fatih guleryuz.
　　o LOG4J2-956:? Manual refers to Route "AppenderRef" attribute, should be "ref". Thanks to
　　David Kellerman.
　　o LOG4J2-944:? Log4j Flume appender is not adding millisecond to the event headers when the
　　event is logged at 000 milliseconds. Thanks to Vinayaka Ramachandra.
　　o LOG4J2-924:? Log4j 1.2 Bridge doesn't map level ALL correctly in Category.getEffectiveLevel().
　　Thanks to Ryan Rupp.
　　o LOG4J2-931:? ConsoleAppender is missing @PluginFactory annotation at createAppender method.
　　Thanks to Robert Gacki.
　　o LOG4J2-919:? Logging system fails to initialize if XInclude API is not available. Thanks
　　to David Johle.
　　o LOG4J2-914:? ThrowableProxy.getExtendedStackTraceAsString causes NullpointerException. Thanks
　　to Kaj Bjurman.
　　o LOG4J2-912:? XML configuration does not report full error message for XInclude parser configuration
　　problems.

　　o LOG4J2-903:?>　　Molinari.
　　o LOG4J2-834:? ThrowableProxy throws NoClassDefFoundError. Thanks to Nikita Koval, Leonard
　　Broman, Thiago Kronig.
　　o LOG4J2-893:? NullPointerException on filter when mapping JUL to Log4j2.
　　o LOG4J2-892:? JUL adapter does not map Log4j'2 FATAL level to a JUL level.
　　o LOG4J2-881:? AbstractLifecycle should not implement equals() and hashCode(). Thanks to Mariano
　　Gonzalez.
　　o LOG4J2-897:? Javadoc for org.apache.log4j.BasicConfigurator.configure() is incorrect.
　　o LOG4J2-891:? AbstractLifecycle should not implement equals() and hashCode().
　　o LOG4J2-946:? [docs] Using Log4j 2 in Web Applications: Update example (Log4jWebLifeCycle
　　is not visible). Thanks to artemonster.
　　
　　功能改进：
　　o LOG4J2-955:? Documentation: clarify system properties to control status logger, improve
　　troubleshooting FAQ entry.
　　o LOG4J2-950:? Incorrect attribute name in PropertiesRewritePolicy example. Thanks to Joel
　　Edwards.

　　o LOG4J2-901:? Update docs for SyslogAppender: "No structured>　　to Tihomir Me??i?, Siegfried Greisinger.
　　o LOG4J2-958:? Update from Jackson 2.5.0 to 2.5.1.
　　o LOG4J2-925:? Update from Jackson 2.4.4 to 2.5.0.
　　o LOG4J2-910:? Update Jackson from 2.4.3 to 2.4.4.
　　o LOG4J2-881:? Update Jackson from 2.4.2 to 2.4.3.
　　o LOG4J2-882:? Update maven-core from 3.1.0 to 3.2.3.
　　o LOG4J2-883:? Update tests from org.apache.felix.framework 4.2.1 to 4.4.1.
　　o LOG4J2-884:? Update org.eclipse.osgi from 3.6.0 to 3.7.1.
　　o LOG4J2-900:? Update Apache Flume from 1.5.0.1 to 1.5.2.
　　
　　Apache Log4j 2.2 最低要求 Java 6，以后的版本要求 Java 7。
　　
　　更多改进内容请看发行说明。
　　

　　Log4j是Apache的一个开放源代码项目，通过使用Log4j，我们可以控制日志信息输送的目的地是控制台、文件、GUI组件、甚至是套接口服务 器、NT的事件记录器、UNIX Syslog守护进程等;我们也可以控制每一条日志的输出格式;通过定义每一条日志信息的级别，我们能够更加细致地控制日志的生成过程。最令人感兴趣的就是，这些可以通过一个配置文件来灵活地进行配置，而不需要修改应用的代码。
　　在线Javadoc：http://www.ostools.net/apidocs/apidoc?api=log4j-1.2.16