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Strange error

 
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Is there anyone who knows what can cause the following error? I see this error in my logfile. In the browser the page looks ok, but when I do a formsubmit, I get a generic system error (_err_invalid_cookie). Does anyone have seen this problem before?
[01.10.22 09:36:44:717 CEST] ce974c8d WebGroup X Servlet ERROR: {0}
"ERROR: Cannot forward. Writer or Stream already obtained."
com.ibm.servlet.engine.webapp.WebAppErrorReport: ERROR: Cannot forward. Writer or Stream already obtained.
at com.ibm.servlet.engine.webapp.WebApp.sendError(WebApp.java:494)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:86)
at com.ibm.commerce.command.HttpForwardViewCommandImpl.forwardDocument(HttpForwardViewCommandImpl.java)
at com.ibm.commerce.command.HttpForwardViewCommandImpl.performExecute(HttpForwardViewCommandImpl.java(Compiled Code))
at com.ibm.commerce.command.ECCommandImpl.execute(ECCommandImpl.java)
at com.ibm.commerce.webcontroller.ViewCmdExecUnit.execute(ViewCmdExecUnit.java)
at com.ibm.commerce.webcontroller.WebController.executeTransaction(WebController.java(Compiled Code))
at com.ibm.commerce.webcontroller.WebController.processRequest(WebController.java)
at com.ibm.commerce.adapter.HttpAdapterImpl.processRequest(HttpAdapterImpl.java)
at com.ibm.commerce.server.RequestServlet.service(RequestServlet.java)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:580)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:160)
at com.ibm.servlet.engine.webapp.ServicingServletState.service(StrictLifecycleServlet.java:307)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:105)
at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:353)
at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:729)
at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:655)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:338)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:175)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:93)
at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:77)
at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67)
at com.ibm.servlet.engine.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:106)
at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:160)
at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:300)
at com.ibm.servlet.engine.oselistener.SQEventListenerImp$ServiceRunnable.run(SQEventListenerImp.java:230)
at com.ibm.servlet.engine.oselistener.SQEventListenerImp.notifySQEvent(SQEventListenerImp.java:104)
at com.ibm.servlet.engine.oselistener.serverqueue.SQEventSource.notifyEvent(SQEventSource.java:212)
at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.notifyService(SQWrapperEventSource.java:347)
at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.run(SQWrapperEventSource.java:216)
at com.ibm.servlet.engine.oselistener.outofproc.OutOfProcThread$CtlRunnable.run(OutOfProcThread.java:248)
at java.lang.Thread.run(Thread.java:481)
[01.10.22 09:36:45:388 CEST] ce974c8d WebGroup X Root Cause
java.lang.IllegalStateException: ERROR: Cannot forward. Writer or Stream already obtained.
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:86)
at com.ibm.commerce.command.HttpForwardViewCommandImpl.forwardDocument(HttpForwardViewCommandImpl.java)
at com.ibm.commerce.command.HttpForwardViewCommandImpl.performExecute(HttpForwardViewCommandImpl.java(Compiled Code))
at com.ibm.commerce.command.ECCommandImpl.execute(ECCommandImpl.java)
at com.ibm.commerce.webcontroller.ViewCmdExecUnit.execute(ViewCmdExecUnit.java)
at com.ibm.commerce.webcontroller.WebController.executeTransaction(WebController.java(Compiled Code))
at com.ibm.commerce.webcontroller.WebController.processRequest(WebController.java)
at com.ibm.commerce.adapter.HttpAdapterImpl.processRequest(HttpAdapterImpl.java)
at com.ibm.commerce.server.RequestServlet.service(RequestServlet.java)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:580)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:160)
at com.ibm.servlet.engine.webapp.ServicingServletState.service(StrictLifecycleServlet.java:307)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:105)
at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:353)
at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:729)
at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:655)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:338)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:175)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:93)
at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:77)
at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67)
at com.ibm.servlet.engine.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:106)
at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:160)
at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:300)
at com.ibm.servlet.engine.oselistener.SQEventListenerImp$ServiceRunnable.run(SQEventListenerImp.java:230)
at com.ibm.servlet.engine.oselistener.SQEventListenerImp.notifySQEvent(SQEventListenerImp.java:104)
at com.ibm.servlet.engine.oselistener.serverqueue.SQEventSource.notifyEvent(SQEventSource.java:212)
at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.notifyService(SQWrapperEventSource.java:347)
at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.run(SQWrapperEventSource.java:216)
at com.ibm.servlet.engine.oselistener.outofproc.OutOfProcThread$CtlRunnable.run(OutOfProcThread.java:248)
at java.lang.Thread.run(Thread.java:481)
 
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The problem clearly lies here
"ERROR: Cannot forward. Writer or Stream already obtained."
This may be because you are invoking the getWriter() method twice in your code. You can do this only once in the servlet.


------------------

Mahindrakar
IBM Application Server Forum Moderator

Consultant - Zensar Technologies ,Pune India.
SCJP2, SCJD2 & SCJEA (Part I)
 
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Try removing any System.out s you have placed during testing. Especially in the JSPs.
 
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