Servlet output streaming problem

Hi all !
          Given the following JSP/Servlet:
          <html>
          <body>
          Test
          <%
          out.println( "<h1>Countdown</h1>" );
          for ( int i = 10; i > 0; i-- ) {
          out.print( "<h1>" );
          out.print( i );
          out.println( "</h1>" );
          out.flush();
          try {
          // simulate access to an external system
          Thread.sleep( 1000 );
          catch ( InterruptedException e ) {}
          out.println( "<h1>Liftoff</h1>" );
          out.close();
          %>
          </body>
          </html>
          This prints out the numbers 10 to 0 with a seconds pause inbetween.
          This works on our development server. However, after uploading to the
          production server, the page is blank for ten seconds and then shows
          all the numbers in one chunk. The problem is that the out.flush()
          statement appearently is ignored by the weblogic server. No errors or
          exceptions in any logs.
          Is this a configuration issue ?
          Setup:
          * Weblogic 5.1
          * Linux Redhat 7.2
          Thanks.
          Pål O.

Do you have a proxy in front of WL? Do you have a web proxy on the client
          side?
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com/coherence.jsp
          Tangosol Coherence: Clustered Replicated Cache for Weblogic
          "Pål O. Kristiansen" <[email protected]> wrote in message
          news:[email protected]...
          > Hi all !
          >
          > Given the following JSP/Servlet:
          >
          > <html>
          > <body>
          > Test
          > <%
          > out.println( "<h1>Countdown</h1>" );
          > for ( int i = 10; i > 0; i-- ) {
          > out.print( "<h1>" );
          > out.print( i );
          > out.println( "</h1>" );
          > out.flush();
          > try {
          > // simulate access to an external system
          > Thread.sleep( 1000 );
          > }
          > catch ( InterruptedException e ) {}
          > }
          > out.println( "<h1>Liftoff</h1>" );
          > out.close();
          > %>
          > </body>
          > </html>
          >
          > This prints out the numbers 10 to 0 with a seconds pause inbetween.
          > This works on our development server. However, after uploading to the
          > production server, the page is blank for ten seconds and then shows
          > all the numbers in one chunk. The problem is that the out.flush()
          > statement appearently is ignored by the weblogic server. No errors or
          > exceptions in any logs.
          >
          > Is this a configuration issue ?
          >
          > Setup:
          > * Weblogic 5.1
          > * Linux Redhat 7.2
          >
          > Thanks.
          >
          > Pål O.

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     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Info:Step Repository-import ended with result 'fatal error' ,stopping execution at 2006-12-06 16:42:07.0027 +5:00
Any clues on which output stream is getting shut???
regards,
avadh

Hi Pascal,
yup, There is enough free space available. Java heap size is also adequate(1024).
I have been through most of the threads on this topic, and have re-checked everything.
Still, the problem persists.
Any ideas??
regards,
avadh

Applet Servlet Comm. Problem

Dear friends,
i have an applet that sends a serialized object to the servlet,the Servlet creates another object and passes it back to the applet.
Everything works fine, till i read the object with:
ObjectInputStream objInputStream = new ObjectInputStream(in);
        show("got object input stream");
         chart = new ChartPanel((JFreeChart)objInputStream.readObject());At this point, i got nothing back.Instead i get a "null"returned on my Java Console.
From JBuilder it works fine
Here is the code
//This is called from the applet in order to load a chart in a panel
private JPanel getChartFromServlet(Object[] parameters) throws Throwable {
ChartPanel chart=null;
String server;
   try {
///////////////////////create URL Connection to SERVLET
    if (this.remoteServerMode) {
      this.show("http://10.30.1.38:8080/AppletToServlet/DbServlet");
       server="http://10.30.1.38:8080/AppletToServlet/DbServlet";
     else {
       server="http://localhost:8083/DbServlet";
     //SEND DATA TO SERVLET
     URLConnection servletCon=this.getServletConnection(server);
     // servletCon.setRequestProperty("Content-Type","application/octet-stream");
      //send the query parameters using serialization
       ObjectOutputStream out=new ObjectOutputStream(servletCon.getOutputStream());
       out.writeObject( parameters);
       out.flush();
       out.close();
       this.show("Finish with send to servlet");
       //GET DATA FROM SERVLET
       InputStream in=servletCon.getInputStream();
       show("got input stream");
       ObjectInputStream objInputStream = new ObjectInputStream(in);
        show("got object input stream");
         chart = new ChartPanel((JFreeChart)objInputStream.readObject());
         show("got chart");
        objInputStream.close();
        in.close();
        chart.setPreferredSize(new Dimension(734, 370));
   catch (Exception ex) {
     System.err.println("Exception caught");
     this.show(ex.getMessage());
     this.show(ex.getMessage());
     System.err.println(ex.getMessage());
     ex.printStackTrace(System.err);
   throw new Exception( ex.getCause());
return chart;
//Servlet Side Code
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
      ServletException, IOException {
    ObjectInputStream inputStreamFromApplet=null;
    Object[] queryParams;
JFreeChart chart=null;
    try {
      response.setContentType("application/x-java-serialized-object");
      //////////////////////////READ INPUT//////////////////////////////////////
      InputStream in=request.getInputStream();
      inputStreamFromApplet=new ObjectInputStream(in);
      //Read applet's serialised object passed in Input Stream
      queryParams = (Object[]) inputStreamFromApplet.readObject();
      //do something with serialized object
      chart=getRequestedChart(queryParams);
      //////////////////////////WRITE OUTPUT////////////////////////////////////
      //open an output stream
      ObjectOutputStream out = new ObjectOutputStream(response.getOutputStream());
      //write to output stream
      out.writeObject(chart);
      out.flush();
      //close output stream
      out.close();
    catch (Exception ex) {
      ex.printStackTrace();
      System.err.println(ex.getMessage());
}Do you have any ideas?
Apart from the null value,i saw also some SocketException
Is there a security issue involved?Both Servlet and Applet come from the same ip.
Thank you very much in advance,
Chris

A Chart constructor takes as an arg a JFreeChart.
Chart is a JComponent so i cannot serialize it.
That's why the servlet passes a JFreechart object and
the applet constructs a chart from it.
I cast the object to a jfreechart and pass it to the constructor of the chart.
The strange thing also is that, wghile initially with a non perfectly designed UI,everything worked fine but when i modified the applet's UI ,problems started...
Something with serialization and versions of classes?

Opening Output Stream to a file on the server from Applet

Hi,
I am trying to write a little applet which parses a file found on the server , lets the user select some Strings then write the selected Strings to a different file on the server. I use the following code:
String fileName = new String("LineUp");
URL docBase = null;
URLConnection conn = null;
try {
docBase = new URL(ApppletName.codeBase, fileName);
} catch (java.net.MalformedURLException e) {
System.out.println("Couldn't create image: "
+ "badly specified URL");
try {
conn = docBase.openConnection();
} catch(IOException e) {System.out.println(e);}
String playerString;
try {
conn.setAllowUserInteraction(true);
conn.setDoOutput(true);
conn.connect();
PrintWriter out = new PrintWriter(
conn.getOutputStream());
etc..
The problem I am having is that the getOutputStream routine for the connection object does nothing other than throw an exception (I've stepped through the code and that is all the routine actually does). The connection is actually made but no output stream can be created. I have looked at the Java Tutorial (as I am fairly new to Java) and found a spot where they tell you how to write to a file on the server, which is the example I have followed. Any suggestions? What am I missing?

Yes, that's what I thought. It talks about writing to a URL, and you have interpreted "URL" as if it meant "file". A URL is a "Uniform Resource Locator", which is a string that identifies a "resource" on the server. Often that corresponds to a file on the server, but not always. It could be a page that is dynamically generated by a script on the server.
Look again at that page and you will see these words: "At the other end, a cgi-bin script (usually) on the server receives the data, processes it, and then sends you a response, usually in the form of a new HTML page." What that means is, you can't just upload a file to a URL unless you have programmed the server to deal with that upload. That's part of the basic design of the HTTP protocol.
So, unfortunately, you can't do what you want all that easily. You would have to provide some programming at the server to handle the file upload for you. In Java that means writing a servlet and getting the web server to have that servlet handle all requests to a particular URL. I suspect you don't want to get into that just yet. But if you do, any decent book on Java servlets should have an example of how to upload files like this.

Servlet output streaming problem

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