为什么 Tomcat 关闭时出现 Throw NoClassDefFoundError？

Question

我的项目包括 Apache commons-* library。
关闭tomcat时抛出异常，如果运行默认示例则不会异常。

卡特琳娜出局：

INFO：非法访问：此 Web 应用程序实例已被停止。无法加载 org.apache.log4j.spi.ThrowableInformation。最终的堆栈跟踪是由出于调试目的引发的错误以及试图终止导致非法访问的线程引起的，并且没有功能影响。

INFO：非法访问：此 Web 应用程序实例已被停止。无法加载 org.apache.log4j.spi.ThrowableInformation。最终的堆栈跟踪是由出于调试目的引发的错误以及试图终止导致非法访问的线程引起的，并且没有功能影响。

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

对于我自己，这个问题在我停止tomcat，删除扩展的war文件夹并再次启动tomcat后就消失了。