Avoiding java.lang.IllegalStateException in jsp

Question

i try to download a generated pdf in jsp.but my log shows following error.how can i avoid this error.my code and error are the following

List<SDO> sdolist = new ArrayList<SDO>();   
    try{
        sdolist = TravelAdvanceRequest.generatePDF(objSession,objList); //calling service
        infoMsg="Pdf Generation Success";
        if (sdolist != null) {
            StringType stringMsg = (StringType) sdolist.get(0);
            infoMsg="pdf generation success......";
            System.out.println("pdf generation success......");
            System.out.println("file path===========>>"+stringMsg.getString());
            ServletOutputStream op          =response.getOutputStream();

         //throw new IllegalStateException("MyException");
        String filename = stringMsg.getString() == null ? "" : stringMsg.getString();
        File                f           =   new File(filename);         
        int                 length      =   0;

        ServletContext      context     =   getServletConfig().getServletContext();
        String              mimetype    =   context.getMimeType( filename );
        if(f.isFile()){
            response.setContentType( (mimetype != null) ? mimetype : "application/octet-stream" ); 
            response.setContentLength( (int)f.length() );
            response.setHeader( "Content-Disposition", "attachment; filename=\"Axis template for "+strCurrency+" account.pdf\"" );
            byte[] bbuf = new byte[1000];
            DataInputStream in = new DataInputStream(new FileInputStream(f));

       while ((in != null) && ((length = in.read(bbuf)) != -1))
            {
                op.write(bbuf,0,length);
            }

            in.close();
            response.getOutputStream().flush();
           // op.flush();
            op.close(); 
            return;
        }else{
            System.out.println("Exception throws there is no such file in the Directory : "+filename);
        }

    }

    }catch(IllegalStateException e1)
    {
        System.out.println("Illegal State Exception......"+e1.getMessage());    
    }
    catch(Exception e)
    {
        System.out.println("Error in Pdf Creation......"+e.getMessage());
        errMsg=e.getMessage();

    }

java.lang.IllegalStateException: getOutputStream() has already been called for this response
    at org.apache.catalina.connector.Response.getWriter(Response.java:619)
    at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
    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.PageContextImpl.release(PageContextImpl.java:188)
    at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118)
    at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77)
    at org.apache.jsp.DebitDetails_jsp._jspService(DebitDetails_jsp.java:374)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tuscany.sca.host.webapp.TuscanyServletFilter.doFilter(TuscanyServletFilter.java:103)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Unknown Source)

I'm guessing you either have a call to `getOutputStream` in a servlet that dispatches to your JSP, or within the JSP itself. It would be helpful if you add more relevant (and properly formatted) code. — NilsH, May 15 '13 at 10:08
see here http://stackoverflow.com/questions/1776142/getoutputstream-has-already-been-called-for-this-response — PSR, May 15 '13 at 10:18
but iam setting the pdf page values from jsp.how can i use servlet to do this job? — S.S.Nath, May 15 '13 at 12:25

score 1 · Accepted Answer · answered May 16 '13 at 05:16

The reason you're getting this error is because you're doing your logic with a JSP. A JSP renders its output with using the Writer object of the response, but you are calling getOutputStream inside the JSP as well. Therefore, you'll get an exception since you're trying to use both the OutputStream and the Writer at the same time. You haven't showed your entire JSP code, but I'm guessing you're doing some output (maybe some blank characters) after your main logic. As @VigneshVino says, you should do your logic inside a servlet instead. A JSP should only be used to render the view.

Avoiding java.lang.IllegalStateException in jsp

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