项目调试过程中tomcat服务器报死线程？怎么回事哪位明白帮看下

严重:   Null   component   Catalina:type=JspMonitor,name=jsp,WebModule=//localhost/FileDeclare,J2EEApplication=none,J2EEServer=none
2007-7-4   16:07:25   org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor   processChildren
严重:   Exception   invoking   periodic   operation:  
java.lang.ThreadDeath
at   org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1221)
at   org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
at   java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at   org.apache.log4j.spi.LoggingEvent. <init> (LoggingEvent.java:238)
at   org.apache.log4j.Category.forcedLog(Category.java:587)
at   org.apache.log4j.Category.log(Category.java:1168)
at   org.apache.log4j.Category.log(Category.java:1177)
at   org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:251)
at   org.apache.catalina.session.StandardManager.start(StandardManager.java:636)
at   org.apache.catalina.core.StandardContext.start(StandardContext.java:4057)
at   org.apache.catalina.core.StandardContext.reload(StandardContext.java:2930)
at   org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:403)
at   org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1276)
at   org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1568)
at   org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1577)
at   org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1577)
at   org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1557)
at   java.lang.Thread.run(Thread.java:595)

这个问题老出现郁闷死了   一死线程就的从起猫   烦死我了  
这个问题跟用log4j有什么关系吗？
我在程序里用这个输出日志   和调试的时候使用

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