This is the documented behavior of IE. It calls 3 times before finally
getting the document. Search the mailing list for "3 times" for more
details.
Best Regards,
Paulo Soares
----- Original Message -----
From: "Lynn Young" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 06, 2003 19:38
Subject: [iText-questions] servlet multiple loops, help please
> Hi,
>
> Following is a very simple servlet code, please help:
>
> public class PrintCheck1 extends HttpServlet implements
> SingleThreadModel
> {
> public synchronized void doGet (HttpServletRequest request,
> HttpServletResponse response) throws IOException, ServletException {
>
>
> String transactionID = request.getParameter("transactionID");
>
> if(transactionID == null) transactionID = "";
> int total = 0;
>
> response.setContentType("application/pdf");
> ByteArrayOutputStream ba = new ByteArrayOutputStream();
>
> if(!transactionID.equals("")){
> try {
> System.out.println(total);
> total ++;
> }catch(Exception e){
> System.out.println(e.toString());
> }finally{
> transactionID = "";
> }
>
> }//end of if
>
> }//end of doGet
>
> public synchronized void doPost (HttpServletRequest request,
> HttpServletResponse response) throws IOException, ServletException {
> System.out.println("get called from doPost");
> doGet(request, response);
> }//end of doPost
> }
>
> And the output of this servlet is:
>
> 0
>
> 0
>
> 0
>
> I think this is because multiple threads are running. But:
>
> 1. I am the only client to call this servlet;
>
> 2. This class already implements SingleThreadModel;
>
> 3. Every variable associated with the request is declard with the doGet
> method;
>
> 4. doGet method is synchronized;
>
> 5. If anything is executed in try block, then finally will be called,
> which set the variable transactionID to empty string.
>
> It seems there are 3 thread running the servlet, why? I think I've done
> everything needed to control the servlet in a single thread.
>
> Another thing I notices is that: if I comment the following code:
>
> response.setContentType("application/pdf");
>
> then the problem is gone. Is it possible that since it takes some time
> to open acrobat reader, it generates multiple threads by itself? I call
> the servlet directly from the location bar of the Internet Explorer.
>
> Anyone has same experience? Thanks in advance.
>
> Lynn
>
>
>
>
>
>
> _____
>
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