tomcat启动lisenter时报java.lang.NoClassDefFoundError

严重: Error configuring application listener of class com.lbs.leaf.sysmanage.webcontroller.LeafInitApplicationListener
java.lang.NoClassDefFoundError
at org.apache.log4j.LogManager.getLogger(LogManager.java:188)
at org.apache.log4j.Logger.getLogger(Logger.java:117)
at com.lbs.leaf.sysmanage.webcontroller.LeafInitApplicationListener.<clinit>(LeafInitApplicationListener.java:42)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at java.lang.Class.newInstance0(Class.java:350)
at java.lang.Class.newInstance(Class.java:303)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3744)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4252)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1117)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1215)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1306)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1570)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1559)
at java.lang.Thread.run(Thread.java:595)类的jar包都有 系统classpath配置也加了.; 请高手帮忙 急！！！！