asynchronous - log4j2 : Async logger is NOT starting

Question

我最近升级了我的应用程序以使用 log4j2。我正在尝试利用其异步记录器功能。但是看起来它没有创建一个。
根据 Log4j Async config ， 它说，

要使所有记录器异步，请将干扰器 jar 添加到类路径并将系统属性 Log4jContextSelector 设置为 org.apache.logging.log4j.core.async.AsyncLoggerContextSelector。
我还在 log4j.xml 中设置 status="trace"以查看它是否配置和实例化异步记录器。但看起来它失败了。

2017-01-25 01:58:30,799 main TRACE Reregistering context (1/1): 'AsyncContext@18b4aac2' org.apache.logging.log4j.core.async.AsyncLoggerContext@6bf08014 2017-01-25 01:58:30,800 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2' 2017-01-25 01:58:30,800 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=StatusLogger' 2017-01-25 01:58:30,800 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=ContextSelector' 2017-01-25 01:58:30,801 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=Loggers,name=' 2017-01-25 01:58:30,801 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=Appenders,name=' 2017-01-25 01:58:30,801 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=AsyncAppenders,name=' 2017-01-25 01:58:30,801 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=AsyncLoggerRingBuffer' 2017-01-25 01:58:30,802 main TRACE Unregistering but no MBeans found matching 'org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=Loggers,name=,subtype=RingBuffer' 2017-01-25 01:58:30,803 main DEBUG Registering MBean org.apache.logging.log4j2:type=AsyncContext@18b4aac2 2017-01-25 01:58:30,805 main DEBUG Registering MBean org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=AsyncLoggerRingBuffer 2017-01-25 01:58:30,806 main DEBUG Registering MBean org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=StatusLogger 2017-01-25 01:58:30,807 main DEBUG Registering MBean org.apache.logging.log4j2:type=AsyncContext@18b4aac2,component=ContextSelector 2017-01-25 01:58:30,816 main TRACE Using default SystemClock for timestamps. 2017-01-25 01:58:30,816 main TRACE Using DummyNanoClock for nanosecond timestamps. 2017-01-25 01:58:30,817 main DEBUG Reconfiguration complete for context[name=AsyncContext@18b4aac2] at URI /etc/opt/sun/im/default/config/log4j2.xml (org.apache.logging.log4j.core.async.AsyncLoggerContext@6bf08014) with optional ClassLoader: null 2017-01-25 01:58:30,817 main DEBUG Shutdown hook enabled. Registering a new one. 2017-01-25 01:58:30,818 main DEBUG LoggerContext[name=AsyncContext@18b4aac2, org.apache.logging.log4j.core.async.AsyncLoggerContext@6bf08014] started OK.

因为我没有看到像“启动 AsyncLogger 破坏者”这样的东西。

然后按照建议，我尝试使用 asyncLogger 标签，我可以看到它在打印，

2017-01-25 00:27:26,970 main TRACE AsyncLoggerConfigDisruptor creating new disruptor for this configuration. 2017-01-25 00:27:26,971 main TRACE property AsyncLoggerConfig.WaitStrategy=TIMEOUT 2017-01-25 00:27:26,987 main DEBUG Starting AsyncLoggerConfig disruptor for this configuration with ringbufferSize=4096, waitStrategy=TimeoutBlockingWaitStrategy, exceptionHandler=org.apache.logging.log4j.core.async.AsyncLoggerConfigDefaultExceptionHandler@7f284218... 2017-01-25 00:27:26,988 main TRACE AsyncLoggerConfig[xmppd] starting...

但是在后期它再次为找不到类抛出异常，

2017-01-25 00:27:31,658 main ERROR Unable to invoke factory method in class class org.apache.logging.log4j.core.async.AsyncLoggerConfig for element AsyncLogger. java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:132) at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:942) at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:882) at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:874) at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:498) at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:227) at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:239) at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:530) at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:603) at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:620) at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:226) at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:242) at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45) at org.apache.logging.log4j.LogManager.getContext(LogManager.java:174) at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:618) at org.apache.logging.log4j.LogManager.getRootLogger(LogManager.java:652) Caused by: java.lang.NoClassDefFoundError: com/lmax/disruptor/EventFactory at org.apache.logging.log4j.core.config.AbstractConfiguration.getAsyncLoggerConfigDelegate(AbstractConfiguration.java:197) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.(AsyncLoggerConfig.java:81) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.createLogger(AsyncLoggerConfig.java:188) ... 23 more Caused by: java.lang.ClassNotFoundException: com.lmax.disruptor.EventFactory at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 26 more

我已经验证过，我包含的破坏者 jar 有这个类。我正在使用disruptor-3.3.6.jar。

另外如何验证异步记录器已启动？

任何帮助，将不胜感激。

Answer 1

添加 LMAX 干扰器 依赖。使用 异步记录器 ，您的 pom.xml应该是这样的

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    <dependency> 
        <groupId>com.lmax</groupId>
        <artifactId>disruptor</artifactId>
        <version>3.3.7</version>
    </dependency>

进一步阅读: Performance of log4j2 compared to log4j1