Solved : Can someone help with Object Input/Output Stream...

[achana chan]

Hi.
I am trying to capture 2 values from the browser/applet and using object input/output stream, pass them to the servlet on the app-server.
JAVA console is showing me meaningless error :

...
BaseTunnelClient : connecting... JSESSIONID=C6AC21B50029D5A6060656FB86E94D6B
java.io.IOException: Server returned HTTP response code: 500 for URL: <a href="http://192.168.1.3/RemoteLoginServer" target="_blank" rel="nofollow">http://192.168.1.3/RemoteLoginServer</a>
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
...etc...

This is the code snippet from the applet in which I am trying to write to the outputstream, so that at the other end they can be read from the input stream :

..
    try
    {
      // Internal buffer
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      // 
      ObjectOutputStream oos = (ObjectOutputStream) _createHeader(baos, 2);
      //
      oos.writeObject(new String(usr));
      oos.writeObject(new String(pwd));
      //
      ObjectInputStream ois = (ObjectInputStream) _invokeMethod(baos.toByteArray());
      //
      usrRec = (usrRecord) ois.readObject();
      //
      oos.close();
      ois.close();       
    } //end of try-block

and this is the code on the server side. The input stream should be able to read the two inbound parameters...

...
    ObjectInputStream  ois = (ObjectInputStream) in;
    ObjectOutputStream oos = (ObjectOutputStream) out;
    //
    switch (ordinal)
    {
      case 0: // connect...
        boolean b0 = demo.connect();
        oos.writeObject(new Boolean(b0));
        break;
      case 1: // close...
        demo.close();
        break;
      case 2: // login...
        String usr = ois.readUTF();
        String pwd = ois.readUTF();
        System.out.println("<===RemoteLoginServer: " + usr + "," + pwd); 
        usrRecord record = demo.login(usr, pwd);
        oos.writeObject(record);
        break;
      default:
        throw new Exception("_invokeMethod() : invalid ordinal: " + ordinal);
    } // end of switch()

Somehow I believe the two paramaters
String usr = ois.readUTF();
String pwd = ois.readUTF();
caused this problem because the code worked well for one parameter of type integer.
Update:
I tried writeUTF() instead of writeObject() and got the same response code 500, pretty meaningless message for me.
Update:
readObject() one end
writeObject() other end


[ November 22, 2002: Message edited by: achana chan ]
[ November 22, 2002: Message edited by: achana chan ]

[ November 22, 2002: Message edited by: achana chan ]

[Cindy Glass]

Moving to streams.

[David Weitzman]

The error is not meaningless. It is an HTTP code that tells you there is an exception being thrown in the servlet (or more generally, that there was an 'internal error' in the server).
The full stack trace should be in your servlet container's log file. With the small excerpt you've given, it's difficult to tell what the problem is. First you need to identify the precise problem, so either head to the log file or insert a try-catch around the servlet code and print the exception somewhere convenient to read.