not able to send data

[Nidhi Nagre]

hello there

i am not able to send data from an applet(embedded in a jsp) to another jsp even though i got successed making connection between these two.

i am using following code at applet side(embedded in jsp)

  
     URL appletURL = getCodeBase();
        String strHost = appletURL.getHost();
        String strPort = String.valueOf(appletURL.getPort());
        String strProtocol = appletURL.getProtocol();
        int portNumber = Integer.parseInt(strPort);
        String strwp ="/UASProject/faces/feedbackform.jsp";        
        URL jspURL = new URL(strProtocol,strHost,portNumber,strwp);  
       
        URLConnection jspCon = jspURL.openConnection();        
        
        jspCon.setUseCaches(false);
        jspCon.setDoOutput(true);
        jspCon.setDoInput(true);       
        
        OutputStream outstream= jspCon.getOutputStream();  
       
        ObjectOutputStream oboutStream = new ObjectOutputStream(outstream);              
        
        oboutStream.writeObject(std_details);          
        oboutStream.flush();         
       // oboutStream.close();         
        URL tempURL = new URL(String.valueOf(jspURL));        
        getAppletContext().showDocument(tempURL,"_self");  
 
//from server
    InputStream instr = jspCon.getInputStream();       
        ObjectInputStream inputFromjsp = new ObjectInputStream(instr);       
        Properties results = (Properties)inputFromjsp.readObject(); 
        inputFromjsp.close();
        instr.close();
 

and this is at server side

  
  ObjectInputStream inputFromjsp = new ObjectInputStream(request.getInputStream());
       std_details = (Properties)inputFromjsp.readObject(); 
 
//to applet
     response.setContentType("application/x-java-serialized-object");
    OutputStream outstr = response.getOutputStream();
       ObjectOutputStream oos = new ObjectOutputStream(outstr);
       oos.writeObject(ce);
       oos.flush();
       oos.close();
 

but when i use std_details object for further implementation the i gets
java.lang.NullPointerException

here std_details is an properties object contains few key/value sets

any help would be much appriciated

[Ulf Dittmer]

JSPs are meant for text, not binary data. While it's theoretically possible for them to send serialized objects, it's practically impossible to do this. Use a servlet instead.
[ November 07, 2007: Message edited by: Ulf Dittmer ]

[Nidhi Nagre]

thanks Mr Ulf

but how much i know and of course you, that the jsp code is ultimately converted into its survlet coordinates.

then it must be possible to accomplish it with jsp as with servlets.

[Ben Souther]

Originally posted by Nidhi Nagre:
thanks Mr Ulf

but how much i know and of course you, that the jsp code is ultimately converted into its survlet coordinates.

then it must be possible to accomplish it with jsp as with servlets.

Not necessarily.
The servlet code generated by JSP compilers contains code that inserts whitespace characters which corrupt an otherwise all binary output stream.
When used as directed, this is not a problem but when developers attempt to use JSP to perform tasks better suited to a servlet, it results in endless headaches.

Save yourself the headaches and do it the easy way from the start.
Use a servlet.

[Nidhi Nagre]

Mr Ben Souther wrote

Not necessarily.
The servlet code generated by JSP compilers contains code that inserts whitespace characters which corrupt an otherwise all binary output stream.
When used as directed, this is not a problem but when developers attempt to use JSP to perform tasks better suited to a servlet, it results in endless headaches.

ok ,i understood
it would be better to use servlet, however might it be possible to redirect the datas sent to servlet towards jsp??

please help me with a suitable example

thanks again

[Ulf Dittmer]

Originally posted by Nidhi Nagre:
however might it be possible to redirect the datas sent to servlet towards jsp?

I'm not quite sure what you're suggesting here, but if you want to stream objects, then no JSPs will (or can) be involved. As Ben asked, why are you resisting to use the right tool?

... that the jsp code is ultimately converted into its survlet coordinates.

then it must be possible to accomplish it with jsp as with servlets.

No. Just because everything that can be done in a JSP can also be done in a servlet, does not mean that everything that can be done in a servlet can also be done in a JSP. This is an example.

[Nidhi Nagre]

Mr Ulf wrote:
I'm not quite sure what you're suggesting here

i was supposed to ask that, is it possible to redirect the datas sent to servlet(from an applet embedded in a jsp) towards another jsp?

ok i will move around your way.

[Bear Bibeault]

Please read this article to see why a JSP is unsuitable for the task.

[Nidhi Nagre]

well, now i want to explain whole of my problems scenario

at the start of my project, there are two jsp's and in which one of them is to prompt for the registration of candidates and another one is to display the feedback of that registration.

moreover, i have designed the registration jsp by embedding applets in it as gui and now i want that, after filling all the reqired fields when user clicks the submit button then he must get the feedback of what all he has entered.

now i am planing this accomplishment as firstly
1. i should post all datas to a servlet from registration jsp in the form of objects and then
2. after converting these to string datas ,redirect all these to feedback jsp.

am i going in a right way?