java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.FilterDispatcher

java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.FilterDispatcher

java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.FilterDispatcher
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:269)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:115)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4072)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4726)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

The problem is caused by the class path.

After you create a dynamic web project under eclipse, you should have the following directory underProject Explorer view.

You may Add External Jars under Java Build Path window like the following:

This works for regular Java project, but does not work for Struts2 web project.

The solution is to simply copy the jar files required to the "lib" directory, then the error message will be gone.
(remove all jars from the class path if you added them before)

Note: Actually, when the error message is something about ClassNotFoundException, we should think in the direction of build path is not correct. Also, different kinds of Java project may use different way to configure build path, e.g., an eclipse plug-in project have to use plug-in to add some library to it.

=======================原文链接http://www.programcreek.com/2012/03/java-lang-classnotfoundexception-org-apache-struts2-dispatcher-filterdispatcher/========

①、先导入你需要的包在LIB下

②、出现这个问题先找是不是有这个地址下有这样这样的class，即是否存在org.apache.struts2.dispatcher.FilterDispatcher

反正我的就是不存在这个类，用了FILTER下的这个类就不报错了，在新的struts-core下地址应该不存在filterdispatcher这个类

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偶然发现这个博客 http://blog.youkuaiyun.com/en_reading/article/details/52467548

满满都是套路