使用Spring/Log4j/Hibernate/Ant访问web应用程序时出现Tomcat错误[SEVERE: Error listenerStart]？

Question

我无法通过Ant访问部署在tomcat上的web应用程序。它部署得很好，但是当我访问它时，浏览器给了我404错误。catalina日志给了我以下异常。它以前是有效的。我错过什么了吗？

Aug 11, 2011 12:06:47 PM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive customercare.war
log4j:WARN No appenders could be found for logger (org.apache.commons.digester.Digester).
log4j:WARN Please initialize the log4j system properly.
Aug 11, 2011 12:07:01 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Aug 11, 2011 12:07:01 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/customercare] startup failed due to previous errors
Exception in thread "Timer-4" java.lang.NullPointerException
    at com.mchange.v2.log.log4j.Log4jMLog$Log4jMLogger.isLoggable(Log4jMLog.java:257)
    at com.mchange.v2.resourcepool.BasicResourcePool$CullTask.run(BasicResourcePool.java:1934)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)

Answer 1

您的记录器配置不正确：

导致错误的行位于外部Log4jMLog的内部类Log4jMLogger中

导致错误的代码行是：return logger.isEnabledFor( level(l) );，因此堆栈跟踪意味着变量logger为null。