Log4j2 Web查看

Question

我在運行於Tomcat 8.0.12的servlet 3.0 Web應用程序中使用log4j2（2.0.2）。我試圖使用weblookup來獲取Web應用上下文路徑作爲日誌文件名稱的一部分。 （我們使用屬性來配置它，在幾個不同的上下文中運行相同的war文件）。

的log4j2.xml文件包括

 <RollingFile name="Web" fileName="/srv/dnsnet/logs/web-${web:contextPath}.logfile" filePattern="/srv/dnsnet/logs/web-${web:contextPath}-%d{yyyy-MM-dd}-%i.log.gz" append="true" immediateFlush="false"> 
     <PatternLayout> 
      <Pattern>%d %-5p [%25.25t] %40.40c{3.} %15X{sysid} %m%n</Pattern> 
     </PatternLayout> 
     <Policies> 
      <TimeBasedTriggeringPolicy /> 
     </Policies> 
     <DefaultRolloverStrategy max="8"/> 
    </RollingFile> 

但網站：contextPath中沒有得到解決。我的web應用程序中有log4j-web-2.0.2.jar。我向WebLookup類添加了一些消息，問題是LoggerContext的外部上下文爲空。

所以我試着看看LoggerContext的創建地點。調用LoggerContext構造函數時的堆棧跟蹤是

at org.apache.logging.log4j.core.LoggerContext.<init>(LoggerContext.java:114) 
    at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:218) 
    at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:113) 
    at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:80) 
    at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:82) 
    at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:37) 
    at org.apache.logging.log4j.LogManager.getContext(LogManager.java:269) 
    at org.apache.logging.log4j.jcl.LogFactoryImpl$PrivateManager.getContext(LogFactoryImpl.java:108) 
    at org.apache.logging.log4j.jcl.LogFactoryImpl.getLoggersMap(LogFactoryImpl.java:52) 
    at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:43) 
    at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:75) 
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:685) 
    at org.apache.myfaces.webapp.AbstractMyFacesListener.<clinit>(AbstractMyFacesListener.java:34) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408) 
    at java.lang.Class.newInstance(Class.java:433) 
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:151) 
    at org.apache.catalina.core.ApplicationContext.addListener(ApplicationContext.java:1231) 
    at org.apache.catalina.core.ApplicationContextFacade.addListener(ApplicationContextFacade.java:647) 
    at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:110) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5164) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724) 
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700) 
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:714) 
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:581) 
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1686) 
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745 

但是，ClassLoaderContextSelector始終爲外部上下文傳遞null。所以看起來好像我錯過了一些東西。

任何人都可以建議我做錯了什麼，或失蹤？我是否必須指定不同的ContextSelector？

Answer 1

您可能在log4j中發現了一個錯誤。我懷疑Commons Logging和WebLookup的組合是行不通的。您可以驗證是否屬於這種情況（如果您的應用程序使用log4j 2 API而不是Commons Logging，請檢查WebLookup是否有效）並在log4j2 Jira issue tracker中提交錯誤報告？