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Problem in Servlet in Websphere

Yugandhar Reddy
Greenhorn

Joined: Jun 10, 2002
Posts: 2
I have a servlet in my application where i am using the following code to forward to jsp.
RequestDispatcher rd = getServletContext().getRequestDispatcher("/user/u_process_acknowledgement.jsp");
rd.forward(req,res);
In JRUN i am not getting any problem. In Websphere the following error is coming.
Servlet Error: ERROR: Cannot forward. Writer or Stream already obtained.: java.lang.IllegalStateException: ERROR: Cannot forward. Writer or Stream already obtained.
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:96)
at ProcessServlet.doGet(ProcessServlet.java:385)
at ProcessServlet.doPost(ProcessServlet.java:398)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:827)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:159)
at com.ibm.servlet.engine.webapp.ServicingServletState.service(StrictLifecycleServlet.java:306)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:106)
at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:472)
at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:1012)
at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:913)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:499)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:278)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:105)
at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:492)
at user.PassValue_0005fr_jsp_0._jspService(PassValue_0005fr_jsp_0.java:352)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:139)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:286)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:415)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:544)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:827)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:159)
at com.ibm.servlet.engine.webapp.ServicingServletState.service(StrictLifecycleServlet.java:306)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:106)
at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:472)
at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:1012)
at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:913)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:499)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:278)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:105)
at com.ibm.servlet.engine.srt.WebAppInvoker.doForward(WebAppInvoker.java:67)
at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:123)
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:125)
at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:315)
at com.ibm.servlet.engine.http11.HttpConnection.handleRequest(HttpConnection.java:60)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:313)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:242)
at com.ibm.ws.util.CachedThread.run(ThreadPool.java:122)


Reddy
sim sim
Ranch Hand

Joined: Jun 05, 2002
Posts: 55
Hi Yugandhar,
forward() will not work if u have already obtained an output strean to the consloe/browser. U might have used response.getWriter() in ur servlet. Remove that line and ur servlet will work fine.
Regards,
Sim Sim.
 
 
subject: Problem in Servlet in Websphere
 
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Cannot forward. Writer or Stream already obtained