Re: [xml-dev] servlet and xml getting java.lang.IllegalStateException

[Tatu Saloranta <cowtowncoder@yahoo.com>]

This is more a Java+Servlet question, as your problem
has nothing to do specifically with XML. So you
probably should ask this question on some other
mailing list (classes involved look like Tomcat
classes, but embedded in Sun's App server?).

-+ Tatu +-

--- Seetha Rama Krishna <ram_kurra@yahoo.co.in> wrote:

> 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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