servlet and xml getting java.lang.IllegalStateException

[Seetha Rama Krishna <ram_kurra@yahoo.co.in>]

Hi All,
            I am tryng to  generate the xml file from servlet.   I am getting the  following exception.
  
  [#|2006-06-16T16:40:21.187+0530|SEVERE|sun-appserver-pe8.1_02|javax.enterprise.system.container.web|_ThreadID=21;|ApplicationDispatcher[/ruleengine]  Servlet.service() for servlet jsp threw exception
  java.lang.IllegalStateException: getOutputStream() has already been called for this response
      at org.apache.coyote.tomcat5.CoyoteResponse.getWriter(CoyoteResponse.java:619)
      at org.apache.coyote.tomcat5.CoyoteResponseFacade.getWriter(CoyoteResponseFacade.java:181)
      at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:143)
      at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:136)
      at
 org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:195)
      at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:120)
      at org.apache.jasper.runtime.JspFactoryImpl.access$100(JspFactoryImpl.java:42)
      at org.apache.jasper.runtime.JspFactoryImpl$PrivilegedReleasePageContext.run(JspFactoryImpl.java:178)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:78)
      at org.apache.jsp.htmls.jsps.backUp1_jsp._jspService(backUp1_jsp.java:287)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:105)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
      at
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:336)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:251)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
      at sun.reflect.GeneratedMethodAccessor128.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
      at
 org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
      at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)
      at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)
      at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:723)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:482)
 
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:417)
      at org.apache.catalina.core.ApplicationDispatcher.access$000(ApplicationDispatcher.java:80)
      at org.apache.catalina.core.ApplicationDispatcher$PrivilegedForward.run(ApplicationDispatcher.java:95)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:313)
      at com.stivant.esp.ruleengine.servlet.BackUpServlet1.doGet(Unknown Source)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:747)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
      at sun.reflect.GeneratedMethodAccessor128.invoke(Unknown Source)
      at
 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
      at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
      at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)
      at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)
      at
 org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
      at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:225)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
      at
 org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:132)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:933)
      at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:185)
      at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:653)
      at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:534)
      at com.sun.enterprise.web.connector.grizzly.ProcessorTask.doTask(ProcessorTask.java:403)
      at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:55)
  |#]
  
  
      Here is my
 code 
  XMLSerializer serial = new XMLSerializer(stringOut,    new OutputFormat("xml", "UTF-8", true));
              serial.setOutputCharStream(new FileWriter(backupFileName));
              serial.serialize(doc.getDocumentElement());
  
              response.setContentType("application/xml");
               response.setHeader("Content-Disposition", "attachement; filename="+  backupFileName);
              File fileToDownload = new File(backupFileName);
              FileInputStream fileInputStream = new FileInputStream(fileToDownload);
              int i = 0;
         
     OutputStream os = response.getOutputStream();
              while ((i = fileInputStream.read()) != -1) {
                  os.write(i);
              }
              fileInputStream.close();
              
  
              }
  
  Can u guys tell me  how to set the output format for the output stream??
  
  regards,
  Krish

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