Java.lang.ClassNotFoundException:org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFil

Project start times wrong: Java.lang.ClassNotFoundException:org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

The jar package version number of the STRUTS2 is 2.1.8, so the class name is no error, and the jar package does join in. The jar package is added by using the user Library.

The problem is solved by copying the jar package to the Lib folder directory under Web-inf and restarting the Tomcat problem resolution.

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Why is the jar added by the user libraries invalid, and the copy into the Lib directory can? And why are common Java projects (non-web projects) available through user libraries?

Another blogger in Csdn has explained clearly that the link address is as follows: http://blog.csdn.net/qiulongtianshi/article/details/8520854

Java.lang.ClassNotFoundException:org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFil