Hi,
I'm trying to write a struts action that will render a PDF rather than
some JSP. My code is below. The problem is that the line to get the
output stream throws an exception:
java.lang.IllegalStateException: getOutputStream() has already been called for
this response
org.apache.coyote.tomcat5.CoyoteResponse.getWriter(CoyoteResponse.java:599)
org.apache.coyote.tomcat5.CoyoteResponseFacade.getWriter(CoyoteResponseFacade.java:163)
org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:122)
org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:115)
org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:190)
org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:115)
org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:75)
org.apache.jsp.util.error_jsp._jspService(error_jsp.java:90)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1062)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
Any ideas where I'm going wrong?
Cheers,
Bart.
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception {
//create the needed helper items
SessionHelper sessHelp = new SessionHelper(request.getSession(true));
RequestHelper reqHelp = new RequestHelper(request);
Logger log = new Logger(this.getClass().getName(), false);
MessageResources messageResources = getResources(request);
AssignmentService service = new AssignmentService();
UserDataBean userData = sessHelp.getUserData();
//
// Get form data
//
DynaActionForm theForm = (DynaActionForm)form;
String aid = (String)theForm.get("aid");
//get the details of the assignment
AssignmentDetailsBean details = null;
//if we got no assignment ID from the form, try get details from the
session
if(aid == null || aid.equals("")) {
try {
details = sessHelp.getCurrentAssignment();
} catch(Exception e) {
log.iLogWarning("Failed to retrieve Assignement Details from the
session", e);
reqHelp.setErrorMessage(messageResources.getMessage("paper.renderPdf.fail.insufficientData"));
return mapping.findForward("error");
}
} else {
//try get one from the DB and make sure we are allowed to view it
try {
details = service.getAssignmentDetails(aid);
//ensure that the person logged in can see the paper
if(!service.canViewPaper(userData, aid)) {
log.iLogInfo("***security*** The user " +
userData.getUserName() + " tried to view the paper " + aid + " which
they are not authorised to view.");
reqHelp.setErrorMessage(messageResources.getMessage("paper.renderPdf.fail.noAuth"));
return mapping.findForward("error");
}
} catch(Exception e) {
log.iLogWarning("Failed to retrieve Details for the assignment "
+ aid + " from the DB", e);
reqHelp.setErrorMessage(messageResources.getMessage("paper.renderPdf.fail"));
return mapping.findForward("error");
}
}
//output the PDF
PaperOutputter paperOut = new PaperOutputter(details, messageResources);
try {
paperOut.renderPdf(response.getOutputStream());
} catch(Exception e) {
log.iLogWarning("Failed to render the PDF for the paper " + aid, e);
reqHelp.setErrorMessage(messageResources.getMessage("paper.renderPdf.fail"));
return mapping.findForward("error");
}
//end the request
return mapping.findForward(null);
}
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