如何在 Log4j 2 Socket appender 中覆盖 DefaultErrorHandler？

Question

目前我在 XML 中定义的<Socket> appender 使用org.apache.logging.log4j.core.appender.DefaultErrorHandler，但它会打印一些我不想出现在catalina.out 中的信息。

log4j2.xml

这是我目前拥有的：

<Appenders>
    <Socket name="socketLoggerAdapter" host="my-server" port="4006" protocol="UDP" reconnectionDelayMillis="60000">
        <JsonLayout properties="true"/>
    </Socket>
...
<Appenders>

我希望我可以添加一个子元素 <handler class="com.mycompany.MyErrorHandler">，但我在 Log4j 2 文档中找不到任何解决此用例的内容。

有人可以指点我一些文档或提供有关如何实现此功能的基本步骤吗？

我想压制什么

我的catalina.out 偶尔会在tomcat 启动期间记录此问题，我不希望它被报告：

2020-06-30 18:12:38,238 AsyncAppender-myAppenderRef-socketAppender ERROR An exception occurred processing Appender socketAppender org.apache.logging.log4j.core.appender.AppenderLoggingException: Error flushing stream UDP:myserver:9006
    at org.apache.logging.log4j.core.appender.OutputStreamManager.flush(OutputStreamManager.java:176)
    at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:107)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:165)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:138)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:97)
    at com.mycompany.MyCustomAppender$AsyncThread.callAppender(MyCustomAppender.java:455)
    at com.mycompany.MyCustomAppender$AsyncThread.run(MyCustomAppender.java:398)
Caused by: java.io.IOException: Message too long
    ... 8 more

其他信息

以下是错误处理程序的初始化方式：

org.apache.logging.log4j.core.appender.DefaultErrorHandler.<init>(org.apache.logging.log4j.core.Appender) line: 47  
org.apache.logging.log4j.core.appender.ConsoleAppender(org.apache.logging.log4j.core.appender.AbstractAppender).<init>(java.lang.String, org.apache.logging.log4j.core.Filter, org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, boolean) line: 40  
org.apache.logging.log4j.core.appender.ConsoleAppender(org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender<M>).<init>(java.lang.String, org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, org.apache.logging.log4j.core.Filter, boolean, boolean, M) line: 60   
org.apache.logging.log4j.core.appender.ConsoleAppender.<init>(java.lang.String, org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, org.apache.logging.log4j.core.Filter, org.apache.logging.log4j.core.appender.OutputStreamManager, boolean) line: 69   
org.apache.logging.log4j.core.appender.ConsoleAppender.createDefaultAppenderForLayout(org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>) line: 106   
org.apache.logging.log4j.core.config.DefaultConfiguration.<init>() line: 62 
org.apache.logging.log4j.core.LoggerContext.<init>(java.lang.String, java.lang.Object, java.net.URI) line: 75   
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(java.lang.ClassLoader, java.net.URI) line: 145  
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(java.lang.String, java.lang.ClassLoader, boolean, java.net.URI) line: 70   
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(java.lang.String, java.lang.ClassLoader, boolean) line: 57 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(java.lang.String, java.lang.ClassLoader, java.lang.Object, boolean) line: 141 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(java.lang.String, java.lang.ClassLoader, java.lang.Object, boolean) line: 41  
org.apache.logging.log4j.LogManager.getContext(java.lang.ClassLoader, boolean) line: 185    
org.apache.logging.slf4j.Log4jLoggerFactory(org.apache.logging.log4j.spi.AbstractLoggerAdapter<L>).getContext(java.lang.Class<?>) line: 103 
org.apache.logging.slf4j.Log4jLoggerFactory.getContext() line: 43   
org.apache.logging.slf4j.Log4jLoggerFactory(org.apache.logging.log4j.spi.AbstractLoggerAdapter<L>).getLogger(java.lang.String) line: 42 
org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(java.lang.String) line: 29    
org.slf4j.LoggerFactory.getLogger(java.lang.String) line: 358   
org.apache.log4j.Logger(org.apache.log4j.Category).<init>(java.lang.String) line: 57    
org.apache.log4j.Logger.<init>(java.lang.String) line: 37   
org.apache.log4j.Log4jLoggerFactory.getLogger(java.lang.String) line: 43    
org.apache.log4j.Logger.getLogger(java.lang.String) line: 41    
org.apache.log4j.Logger.getLogger(java.lang.Class) line: 49 
com.mycompany.core.security.SessionUtil.<clinit>() line: 24 
com.mycompany.MyCompanyContextLoaderListener.contextInitialized(javax.servlet.ServletContextEvent) line: 14 
org.apache.catalina.core.StandardContext.listenerStart() line: 4812 
org.apache.catalina.core.StandardContext.startInternal() line: 5255 
org.apache.catalina.core.StandardContext(org.apache.catalina.util.LifecycleBase).start() line: 150  
org.apache.catalina.core.StandardHost(org.apache.catalina.core.ContainerBase).addChildInternal(org.apache.catalina.Container) line: 725 
org.apache.catalina.core.StandardHost(org.apache.catalina.core.ContainerBase).addChild(org.apache.catalina.Container) line: 701 
org.apache.catalina.core.StandardHost.addChild(org.apache.catalina.Container) line: 717 
org.apache.catalina.startup.HostConfig.deployWAR(org.apache.catalina.util.ContextName, java.io.File) line: 945  
org.apache.catalina.startup.HostConfig$DeployWar.run() line: 1795   
java.util.concurrent.Executors$RunnableAdapter<T>.call() line: 471  
java.util.concurrent.FutureTask<V>.run() line: 262  
java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) line: 1145    
java.util.concurrent.ThreadPoolExecutor$Worker.run() line: 615  
java.lang.Thread.run() line: 745    

Answer 1

我相信最近有另一个 Stackoverflow 问题与此有关。这是我的疏忽，您应该为此创建一个 Jira 问题。虽然您可以调用 setErrorHandler 方法来更改 ErrorHandler，但无法配置，因为它没有被初始化为插件。