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java.lang.NullPointerException: 	at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:645)	at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:725)	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)	at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:467)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)	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)