Log4j 2.5 发布，此版本是第九个 GA 版本，包括一些 bug 修复和新特性。新特性包括在 file rollover 的时候指定删除操作；一个基于 CRON 的触发策略；过滤器支持 JSR 223 脚本，模式选择器和删除操作，新增一个策略移除 RoutingAppender 的闲置输出源。 Log4j 2 最低要求 Java 7。 Log4j 2.5 改进列表： 新特性： o LOG4J2-435: Added support for custom delete actions triggered by a rollover. Thanks to Robert Schaft. o LOG4J2-89: Allow rollover to occur at any time. Add CronTriggeringPolicy. o LOG4J2-1136: Add support for JSR 223 scripts in filters and the PatternSelector. o LOG4J2-1168: Add getters for source and destination file in file rename action. Thanks to Steven Swor. o LOG4J2-1175: Add getters for classes in org.apache.logging.log4j.core.appender.rolling.action. o LOG4J2-898: Added system property to allow users to control whether messages should be formatted in the background. o LOG4J2-1178: Support use-case for JDBC's CommonDataSource.setLogWriter(PrintWriter) and java.sql.DriverManager.setLogWriter(PrintWriter). o LOG4J2-1187: Support use case for java.sql.DriverManager.setLogStream(PrintStream). Bugs 修复： o LOG4J2-324: Reduced memory usage of status messages in bounded queue; support zero-length queue that stores no messages. o LOG4J2-1173: Fixed rollover error when copying to a directory mapped to a remote Linux host. o LOG4J2-1195: Make KafkaAppender support SerializedLayout. Thanks to Melvin Du. o LOG4J2-381: Allow triggering policy and rollover strategy to be modified during reconfiguration. Thanks to Anthony Baldocchi. o LOG4J2-1029: Performance improvement when gathering location information. Thanks to Stefan Leonhartsberger. o LOG4J2-1172: Fixed ThreadLocal leak [AsyncLogger$Info] on Tomcat when using AsyncLoggerContextSelector. o LOG4J2-1176: Fixed memory leak when log4j jars are in Tomcat's lib folder. o LOG4J2-1180: Logger cache does not account for message factory. Thanks to Mikael Ståldal. o LOG4J2-879: Documentation: fixed minor issues with the site and manual pages. o LOG4J2-999: RollingFileAppender should also roll over when log event time is equal to rollover time, not only when later. Thanks to Joan Balagueró. o LOG4J2-873: Fixed bug where omitting the <display-name> element in web.xml caused incorrect log4j initialization, resulting in memory leaks when the web application was stopped or reloaded. Thanks to Martin Dickins, LC, Luke Woodward. o LOG4J2-323: Better web app support for async loggers: Fixed a memory leak that occurred when the logging jars are placed in the container's classpath and the configuration file uses AsyncRoot/AsyncLogger. The problem was that the first web application started the Disruptor background thread [AsyncLoggerConfig-1] but did not stop it until all web apps are stopped. Each web application now has its own Disruptor which is stopped/started together with the web app. o LOG4J2-493: Better web app support for async loggers: it is now possible to place the logging jars in the container's classpath when making all loggers asynchronous by using AsyncLoggerContextSelector. This fixes a problem where logging would stop working after stopping and restarting a web application. o LOG4J2-1171: Use servlet context name for logger context name when available. o LOG4J2-1159: Fixed a ThreadLocal memory leak in Tomcat8 that mentions AsyncLoggers when Async Loggers are not used. o LOG4J2-1166: AbstractConfiguration executor should use a DaemonThreadFactory. o LOG4J2-1165: Improve Log4j initialization status messages. o LOG4J2-1156: Web site corrections and updates. o LOG4J2-1158: Log4J JUL adapter is using MessageFormat on String passed by java.util.function.Supplier<String>. Thanks to Michael Fortin, Gary Gregory. o LOG4J2-801: org.apache.logging.log4j.core.Logger should be serializable. o LOG4J2-1157: Fix compilation error for classes annotated with @Plugin. Thanks to Norbert Bartels. o LOG4J2-948: Fix plugin documentation error about Converters. Thanks to Andrew Flower. o LOG4J2-1193: Prefix all thread names Log4j creates with "Log4j2-". o LOG4J2-1194: Documentation does not match parameters for LoggerNameLevelRewritePolicy. Thanks to Adam Brin. o LOG4J2-1196: MongoDbConnection does not close MongoClient. Thanks to René Zanner. 改进： o LOG4J2-649: Add PurgePolicy and IdlePurgePolicy to RoutingAppender. Thanks to Aleksey Zvolinsky. o LOG4J2-1202: Remove ConfigurationMonitor. The WatchManager is now used to check for configuration changes. o LOG4J2-1174: Update Jackson from 2.6.2 to 2.6.3. o LOG4J2-1207: Update kafka-clients from 0.8.2.2 to 0.9.0.0. 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://tool.oschina.net/apidocs/apidoc?api=log4j-1.2.16 Log4j 2.5 发布，Java 日志组件下载地址
