servlet and xml getting java.lang.IllegalStateException

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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