java.lang.NoClassDefFoundError: org/apache/commons/collections/map/MultiKeyMap
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/MultiKeyMap
net.sf.json.JsonConfig.<init>(JsonConfig.java:56)
net.sf.json.JSONArray.fromObject(JSONArray.java:120)
privilege.action.LevelAction.jsonExecute(LevelAction.java:53)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)

请求解决以上问题,谢谢!
是不是因为我的包有冲突?
环境:Spring2.5 Struts2 hibernate3.2 Extjs2.2 json myeclipse7.0

------解决方案--------------------
没有commons-collections.jar包
------解决方案--------------------

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总算OK了...