关于网友提出的“ strutst:return mappingfindForward"welcome1111"时出错”问题疑问，本网通过在网上对“ strutst:return mappingfindForward"welcome1111"时出错”有关的相关答案进行了整理，供用户进行参考，详细问题解答如下：
问题： strutst:return mappingfindForward"welcome1111"时出错描述:
500 Servlet Exception
java.lang.IllegalArgumentException: Request cannot be null
at javax.servlet.ServletRequestWrapper.
at javax.servlet.http.HttpServletRequestWrapper.
at com.caucho.server.connection.RequestAdapter.
at com.caucho.server.webapp.DispatchRequest.
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:161)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:121)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:98)
at org.apache.struts.action.ActionServlet.processActionForward(ActionServlet.java:1759)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1596)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:105)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:149)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:221)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:257)
at com.caucho.server.port.WorkerThread.run(WorkerThread.java:123)
at java.lang.Thread.run(Thread.java:536)
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Resin 3.0.0-beta (built Thu Feb 13 18:21:13 PST 2003)