title: Illegalstateexception: getwriter() has already been called for this response
body: <p>I am trying to open pdf file in browser using the following code snippet:</p>
  
  <pre><code>    public ActionResult action(Request request, AspectModel arg1)
          throws ServletException {
      if ("PDF".equals(request.event())) {
      try{
      HttpServletResponse resp=(HttpServletResponse) request.getResponse();
      resp.setContentType("application/pdf");
      resp.setHeader("Content-Disposition","inline;filename=AccountOpeningSummary.pdf");
      resp.setHeader("Cache-Control", "cache, must-revalidate");
      resp.setHeader("Cache-Control", "no-store,public");
      resp.setDateHeader("Expires", 0);
      resp.setHeader("Pragma", "public");
      OutputStream OutStream = resp.getOutputStream();
      OutStream.write(infos,0,infos.length);
      OutStream.flush();        
      OutStream.close(); 
      }catch (Exception e) {
          System.out.println("PDF Write Exception...........................####"+e);
      }
      }
      return null;
  }
  </code></pre>
  
  <p>I am getting the following error:</p>
  
  <pre><code>java.lang.IllegalStateException: getOutputStream() has already been called for this response
      at org.apache.catalina.connector.Response.getWriter(Response.java:626)
      at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:215)
      at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:105)
      at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
      at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)
      at org.apache.jasper.runtime.JspWriterImpl.flush(JspWriterImpl.java:177)
      at abaxx.web.taglib.IncludeTag.doEndTag(IncludeTag.java:69)
      at org.apache.jsp.parts.index_jsp._jspx_meth_xx_005finclude_005f0(index_jsp.java:237)
      at org.apache.jsp.parts.index_jsp._jspService(index_jsp.java:93)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
      at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593)
      at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530)
      at abaxx.core.foundation.internal.SelfDestroyingHttpServletRequestWrapper$1.include(SelfDestroyingHttpServletRequestWrapper.java:36)
      at abaxx.core.foundation.internal.SelfDestroyingHttpServletRequestWrapper$1.include(SelfDestroyingHttpServletRequestWrapper.java:36)
      at abaxx.web.parts.internal.ServletRequestContext.doInclude(ServletRequestContext.java:85)
      at abaxx.web.parts.RequestContext.include(RequestContext.java:429)
      at abaxx.web.parts.VisualPart.basicDisplay(VisualPart.java:740)
      at abaxx.web.parts.CompositePart.basicDisplay(CompositePart.java:111)
      at abaxx.web.parts.VisualPart.doDisplay(VisualPart.java:762)
      at abaxx.web.control.DisplayLoopInterceptor.display(DisplayLoopInterceptor.java:233)
      at abaxx.web.security.StandardSecurityPolicy$DisplayHook.display(StandardSecurityPolicy.java:321)
      at abaxx.web.control.PerformanceMonitor$DisplayPerformanceInterceptor.display(PerformanceMonitor.java:187)
      at abaxx.web.control.DisplayLoopInterceptor.doDisplay(DisplayLoopInterceptor.java:80)
      at abaxx.web.parts.VisualPart.display(VisualPart.java:104)
      at abaxx.web.control.DisplayLoopInterceptor.process(DisplayLoopInterceptor.java:128)
      at vanilla.portal.builder.PBDisplayLoopInterceptor.process(PBDisplayLoopInterceptor.java:60)
      at vanilla.common.EncodingExtension$ResponseEncodingInterceptor.process(EncodingExtension.java:107)
      at abaxx.web.preferences.PreferencesHookup$2.process(PreferencesHookup.java:126)
      at vanilla.common.HttpHeaderInterceptor.process(HttpHeaderInterceptor.java:36)
      at abaxx.web.control.PageflowInterceptor.process(PageflowInterceptor.java:62)
      at abaxx.workflow.pageflow.PageflowInterceptor.process(PageflowInterceptor.java:93)
      at abaxx.web.control.ActionInterceptor.process(ActionInterceptor.java:49)
      at abaxx.web.security.StandardSecurityPolicy$ActionHook.process(StandardSecurityPolicy.java:211)
      at abaxx.web.control.SessionTimeoutInterceptor.process(SessionTimeoutInterceptor.java:59)
      at abaxx.track.TrackingInterceptor.finishTracking(TrackingInterceptor.java:151)
      at abaxx.track.TrackingInterceptor.process(TrackingInterceptor.java:100)
      at abaxx.web.control.AccessViolationInterceptor.process(AccessViolationInterceptor.java:110)
      at abaxx.web.control.RequestProcessor$P9.process(RequestProcessor.java:72)
      at abaxx.web.control.PerformanceMonitor$RequestPerformanceInterceptor.process(PerformanceMonitor.java:153)
      at vanilla.common.EncodingExtension$RequestEncodingInterceptor.process(EncodingExtension.java:61)
      at abaxx.web.control.MaintenanceInterceptor.process(MaintenanceInterceptor.java:44)
      at abaxx.web.control.AbaXXComponentsHookup$ClientSessionHookupInterceptor.process(AbaXXComponentsHookup.java:42)
      at abaxx.web.security.SecurityPolicy$FakeContainerLoginInterceptor.process(SecurityPolicy.java:136)
      at abaxx.web.control.RequestProcessor.process(RequestProcessor.java:187)
      at abaxx.web.control.ApplicationServlet.doGet(ApplicationServlet.java:144)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at abaxx.web.control.url.RequestFilter.doFilter(RequestFilter.java:28)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at abaxx.web.control.CachingHeaderFilter.doFilter(CachingHeaderFilter.java:29)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at vanilla.common.EncodingExtension.doFilter(EncodingExtension.java:121)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:301)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:162)
      at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)
  </code></pre>
  
  <p>I have also tried by closing the <code>getWriter()</code>
  using:</p>
  
  <pre><code>HttpServletResponse resp=(HttpServletResponse) request.getResponse();
  Writer rt=resp.getWriter();
  resp.getWriter().close();
  </code></pre>
  
  <p>Can anyone help me?</p>