ERROR DESCRIPTION:
Using a RequestDispatcher to explicitly forward to the WebContainer's SimpleFileServlet does not work on WebSphere Application Server V7.0 because of the way ServletWrapper tries to initiate the servlet.
The exception would look like this in the logs:
[10/15/08 14:26:48:961 EDT] 00000013 servlet E
com.ibm.ws.webcontainer.servlet.ServletWrapper run [Servlet Error]-[class java.lang.InstantiationException:
com.ibm.ws.webcontainer.servlet.SimpleFileServlet]:
java.lang.ClassNotFoundException: class
java.lang.InstantiationException:
com.ibm.ws.webcontainer.servlet.xxxxxxxxxxServlet
at java.beans.Beans.instantiate(Unknown Source)
at java.beans.Beans.instantiate(Unknown Source)
at com.ibm.ws.webcontainer.servlet.ServletWrapper$1.run(ServletWrap per.java :1682)
at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.loadServlet(ServletWrapper.java:1673)
用SpringMVC或者ZolltyMVC时，当把请求抛给WebContainer默认的Servlt处理时，在websphere7.0.0.0下，就会有这个问题。是websphere的一个BUG。
BUG为：
PK74129; 7.0.0.1: Requestdispatcher forward to static file serving servlet
详见：