ZIP file download throws java.lang.IllegalStateException: Response already

Question

Hello.
In my application I need to implement a functionality where user will able to download multiple image files of their choice in compressed zip format. To implement it I used af:fileDownloadActionListener. I need to submit the form before going to process the zip. For that I have added to af:commandLinks.
The following commandlink will process the download:
<af:commandLink id="cl19" binding="#{pageFlowScope.album.downloadZipLink}" visible="false" text="jym">
                <af:fileDownloadActionListener filename="Compressed.zip" contentType="application/zip" method="#{pageFlowScope.album.downloadZip}"/>
</af:commandLink>And this commandlink will submit the form and invoke the click event of the first commandlink
<af:commandLink text="Download" styleClass="functionButton" id="cl13" actionListener="#{pageFlowScope.album.downloadZip}"/>The downloadZip actionlistener is:
    public void downloadZip(ActionEvent actionEvent) {
        FacesContext context = FacesContext.getCurrentInstance();       
        ExtendedRenderKitService service = Service.getService(context.getRenderKit(), ExtendedRenderKitService.class);
        StringBuilder builder = new StringBuilder();
        builder.append("var link = AdfPage.PAGE.findComponentByAbsoluteId('").append(downloadZipLink.getClientId(context)).append("');");
        builder.append("AdfActionEvent.queue(link, false);");
        service.addScript(context, builder.toString());
    }And the downloadZip af:fileDownloadActionListener's method is:
    public void downloadZip(FacesContext facesContext, OutputStream outputStream) throws IdcClientException, IOException { 
        ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);
        for(List<Image> images : getAlbumDetailCurrent()){
            for(Image image : images){
                if(image.isChecked()) {
                    CloseNotifyInputStream inputStream = (CloseNotifyInputStream)ridcConnection.getFileInputStream(image.getDocId(), image.getDocName());
                    String filename = getImageFilename(image.getDocName(), image.getFormat());       
                    zipOutputStream.putNextEntry(new ZipEntry(filename));
                    IOUtils.copy(inputStream, zipOutputStream);
                    inputStream.close();
                    zipOutputStream.closeEntry();                   
        zipOutputStream.close();
    }Everything is working fine. The zip is creating and and is being thrown to the user, but in console I am getting the following exception:
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase INVOKE_APPLICATION 5
java.lang.IllegalStateException: Response already committed
     at weblogic.servlet.internal.ServletOutputStreamImpl.clearBuffer(ServletOutputStreamImpl.java:360)
     at weblogic.servlet.internal.ServletOutputStreamImpl.reset(ServletOutputStreamImpl.java:313)
     at weblogic.servlet.internal.ServletResponseImpl.reset(ServletResponseImpl.java:328)
     at javax.servlet.ServletResponseWrapper.reset(ServletResponseWrapper.java:193)
     at org.apache.myfaces.trinidadinternal.taglib.listener.FileDownloadActionListener.processAction(FileDownloadActionListener.java:127)
     at oracle.adfinternal.view.faces.event.rich.FileDownloadActionListener.processAction(FileDownloadActionListener.java:77)
     at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcast(UIXComponentBase.java:675)
     at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:179)
     at oracle.adf.view.rich.component.fragment.UIXRegion.broadcast(UIXRegion.java:148)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:92)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:361)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:96)
     at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:102)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:92)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:361)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:96)
     at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:96)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.broadcastEvents(LifecycleImpl.java:1018)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:386)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:194)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.portlet.client.adapter.adf.ADFPortletFilter.doFilter(ADFPortletFilter.java:32)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.webcenter.framework.events.dispatcher.EventDispatcherFilter.doFilter(EventDispatcherFilter.java:44)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:205)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:106)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:271)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:177)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.wcps.client.PersonalizationFilter.doFilter(PersonalizationFilter.java:75)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.webcenter.content.integration.servlets.ContentServletFilter.doFilter(ContentServletFilter.java:168)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.webcenter.lifecycle.filter.LifecycleLockFilter.doFilter(LifecycleLockFilter.java:151)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at com.mhis.webfactory.filter.RelayFilter.doFilter(RelayFilter.java:144)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:179)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:119)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:442)
     at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:103)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:139)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
<16 May, 2012 2:49:10 PM IST> <Error> <HTTP> <BEA-101020> <[ServletContext@2140334934[app:j2ee-app module:hennessy path:/hennessy spec-version:2.5 version:V2.0]] Servlet failed with Exception
java.lang.IllegalStateException: Response already committed
     at weblogic.servlet.internal.ServletOutputStreamImpl.clearBuffer(ServletOutputStreamImpl.java:360)
     at weblogic.servlet.internal.ServletOutputStreamImpl.reset(ServletOutputStreamImpl.java:313)
     at weblogic.servlet.internal.ServletResponseImpl.reset(ServletResponseImpl.java:328)
     at javax.servlet.ServletResponseWrapper.reset(ServletResponseWrapper.java:193)
     at org.apache.myfaces.trinidadinternal.taglib.listener.FileDownloadActionListener.processAction(FileDownloadActionListener.java:127)
     Truncated. see log file for complete stacktraceI am unable to find its cause. It is not causing any problem in webpage.
Any information will be very helpful to me.
I am using JDeveloper 11.1.1.6.0.
Regards.

Answer 1

          The reason for this exception is when you are trying to write something on the
          response stream
          which was already closed (commit) . This may happen when u write something in
          the response stream after doing a redirect/forward. OR if u r trying to redirect/forward
          more than once. bcs once u redirect/forward your response object will be flushed
          and commited..
          Hope this may help u
          regards
          Perianayagam.T
          "Jai Verma" <[email protected]> wrote:
          >
          >Hi,
          >
          >I am getting java.lang.IllegalStateException: response already committed
          >error
          >in log lot of time.
          >Any idea what does this error mean?
          >
          >thanks