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我已经部署了使用 jasperreports 插件的 struts2 应用程序。在 Glassfish3 和 Tomcat 中部署时，报告工作正常。但是当我部署到 Weblogic 11g 时，会给出以下 NPE。

java.lang.NullPointerException
    at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:645)
    at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:819)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:519)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

有谁知道如何解决这个问题？我正在使用 struts 2.2.3 和 struts2-jasper-reports 插件 2.2.3。

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