RE: Problems with sending a serialized object from servlet to applet using Tomcat

["Shapira, Yoav" <Yo...@mpi.com>]

Howdy,
And what was the solution?

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Dicheva, Darina [mailto:dichevad@wssu.edu]
>Sent: Tuesday, December 16, 2003 6:51 PM
>To: 'Tomcat Users List'
>Subject: RE: Problems with sending a serialized object from servlet to
>applet using Tomcat
>
>Thanks to all that helped me with suggestions - I solved my problem.
>Darina
>
>> -----Original Message-----
>> From: Dicheva, Darina [mailto:dichevad@wssu.edu]
>> Sent: Monday, December 15, 2003 11:17 AM
>> To: 'tomcat-user@jakarta.apache.org'
>> Subject: Problems with sending a serialized object from servlet to
>> applet using Tomcat
>>
>>
>> Hello,
>>
>> I have a problem sending a serialized object (instance of a
>> class that is
>> not part of the Java Core API) from a servlet to an applet. I
>> don't have a
>> problem to send a serialized String object though -
>> everything works fine
>> (even in both directions). But when I replace the String
>> object to be sent
>> by the servlet to the applet with an object of a class defined by me,
>> 'inputFromServlet.readObject()' is just hanging -- no
>> exception, no error,
>> nothing. The servlet itself seems to have finished its work
>> completely. I
>> have copied the class definition (of the object being
>> serialized) in the
>> applet's directory.
>>
>> I use Tomcat 4.1.29 and j2sdk1.4.2.
>>
>> Any idea will be highly appreciated. Thanks in advance.
>>
>> Darina
>>
>> ----------------------
>> In the applet I have:
>> try  {
>>           URL servletURL = new URL(getCodeBase(), servletLocation2);
>>           HttpURLConnection servletConnection = (HttpURLConnection)
>> servletURL.openConnection();
>>           servletConnection.setDoOutput(true);
>>           servletConnection.setDoInput(true);
>>           servletConnection.setUseCaches(false);
>>           servletConnection.setDefaultUseCaches(false);
>>
>> servletConnection.setRequestProperty("Content-type","applicati
>> on/x-java-seri
>> alized-object");
>>           servletConnection.setRequestMethod("POST");
>> //if not included
>> the defaul is the GET method
>>
>>           log("Applet Connected");
>>
>>           // Writing to servlet
>>
>>           // Write the message to the servlet
>>           OutputStream os =
>> servletConnection.getOutputStream();  // returns
>> an output stream that writes to this connection
>>           ObjectOutputStream outputToServlet = new
>> ObjectOutputStream(os);
>>
>>
>>           // serialize the object
>> 	    outputToServlet.writeObject("Message To Server");
>>
>> 	    outputToServlet.flush();
>> 	    outputToServlet.close();
>>  	    log("Writing Complete.");
>>
>>           // Reading from servlet
>>
>>           InputStream is = servletConnection.getInputStream();
>>           ObjectInputStream inputFromServlet = new
>> ObjectInputStream(is);
>>           log("Object Input stream created");
>>
>>           Object obj = inputFromServlet.readObject();
>>
>> // HANGS UP HERE !!
>>
>>           Topic response = (Topic)obj;
>>           log("Finish reading data");
>>           inputFromServlet.close();
>>      }
>>      catch ...
>> ----------------------
>>
>> In the servlet I have:
>>
>>  public void doPost(HttpServletRequest request, HttpServletResponse
>> response)
>>                throws ServletException, IOException  {
>>
>>     try
>>     {
>>          InputStream is = request.getInputStream();   //get
>> an input stream
>> that reads from from this open connection
>>          ObjectInputStream inputFromApplet = new
>> ObjectInputStream(is);
>>          show("Servlet Connected");
>>
>> 	   String appStr = (String) inputFromApplet.readObject();
>> 	   show("Applet String: " + appStr);
>>  	   inputFromApplet.close();
>>
>>         // Ctreate a topic
>>          Topic topic = new Topic("Number1 Systems",
>> "tt-NumberSystem1",
>> "N1", "Number1 System", "N1");
>>          show(topic.toString());
>>
>>
>> response.setContentType("application/x-java-serialized-object");
>>
>>          OutputStream os = response.getOutputStream();  //
>> returns an output
>> stream that writes to this connection
>>          ObjectOutputStream outputToApplet = new
>> ObjectOutputStream(os);
>>          show("Servlet connected");
>>
>>          outputToApplet.writeObject(topic);
>>          outputToApplet.flush();
>>          outputToApplet.close();
>>          show("Data transmission complete.");
>>
>>      }
>>      catch ...
>>
>> Can somebody help??? I am struggling with this problem for
>> more than a week
>> ...
>>
>>



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