求助！同样的代码webloic报错！
在weblogic上运行程序：在上传一个文件时，页面上报下面的错误！但在tomcat下好使！
Error 500--Internal Server Error
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.5.1 500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.
查看日志发现，程序的日志里没有报任何错误。但在weblogic日志中报了以下错误！
java.lang.NullPointerException at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:643) at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:725) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at com.ipi.coop.util.SecuritFilter2.doFilter(SecuritFilter2.java:56) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at com.ipi.coop.util.SecuritFilter.doFilter(SecuritFilter.java:79) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3496) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(Unknown Source) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
