为什么在Tomcat关闭时有一个 Throw NoClassDefFoundError？

Question

我的项目包括Apache commons-*库。
在 tomcat 关闭时引发异常，如果运行默认示例，则无异常。

卡特琳娜通话完毕。

信息：非法访问：此 Web 应用程序实例已停止。无法加载 org.apache.log4j.spi.ThrowableInformation.最终的以下堆栈跟踪是由出于调试目的而引发的错误以及尝试终止导致非法访问的线程引起的，并且不会对功能产生影响。

信息：非法访问：此 Web 应用程序实例已停止。无法加载 org.apache.log4j.spi.ThrowableInformation.最终的以下堆栈跟踪是由出于调试目的而引发的错误以及尝试终止导致非法访问的线程引起的，并且不会对功能产生影响。

INFO: Destroying ProtocolHandler ["http-bio-8080"]
Sep 24, 2012 4:00:14 PM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance ses ahas been stopped already.  Could not load org.apache.commons.pool.impl.CursorableLinkedList$Cursor.  The eventual following stack trace is caused by an error thrown for debugging purpos well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.

java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1600)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    at org.apache.commons.pool.impl.CursorableLinkedList.cursor(CursorableLinkedList.java:305)
    at org.apache.commons.pool.impl.GenericObjectPool.evict(GenericObjectPool.java:1536)
    at org.apache.commons.pool.impl.GenericObjectPool$Evictor.run(GenericObjectPool.java:1749)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)

Exception in thread "Timer-0" java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/CursorableLinkedList$Cursor
    at org.apache.commons.pool.impl.CursorableLinkedList.cursor(CursorableLinkedList.java:305)
    at org.apache.commons.pool.impl.GenericObjectPool.evict(GenericObjectPool.java:1536)
    at org.apache.commons.pool.impl.GenericObjectPool$Evictor.run(GenericObjectPool.java:1749)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)


Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool.impl.CursorableLinkedList$Cursor
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    ... 5 more

Answer 1

对我自己来说，在我停止tomcat、删除扩展的war文件夹并再次启动tomcat之后，这个问题就消失了。