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Hi All,
I am faceing a problem (ofcourse thats what makes all of us come
here)..what I am trying to do is , create a image offscreen in a
servlet , then using PixelGrabber serialize the int[] and then the
applet reads it, ..so far fairly straight, now here...
....
....
ObjectOutputStream out = new
ObjectOutputStream(res.getOutputStream());
System.out.println("Inside isReq after out obj");
out.writeInt(w);
out.writeInt(h);
out.writeObject(pixels);
}
/**
try{
res.setContentType("text/html");
printer=res.getWriter();
printer.println("Object Writing done");
printer.close();
}catch(Exception ex){}
}
else{
printer.println("Object Writing <b>Not</b> done");
printer.close();
}**/

After Object writing is being done , I wish to display a html page
(with applet embedded) but using the above code it is giving me a
error "IllegalStateException: Writer being already used by the
servlet..."
Can anyone help me out...

Regards
Ray

"Kim Ray" <> wrote in message
news: m...
> Hi All,
> I am faceing a problem (ofcourse thats what makes all of us come
> here)..what I am trying to do is , create a image offscreen in a
> servlet , then using PixelGrabber serialize the int[] and then the
> applet reads it, ..so far fairly straight, now here...
> ...
> ...
> ObjectOutputStream out = new
> ObjectOutputStream(res.getOutputStream());
> System.out.println("Inside isReq after out obj");
> out.writeInt(w);
> out.writeInt(h);
> out.writeObject(pixels);
> }
> /**
> try{
> res.setContentType("text/html");
> printer=res.getWriter();
> printer.println("Object Writing done");
> printer.close();
> }catch(Exception ex){}
> }
> else{
> printer.println("Object Writing <b>Not</b> done");
> printer.close();
> }**/
>
> After Object writing is being done , I wish to display a html page
> (with applet embedded) but using the above code it is giving me a
> error "IllegalStateException: Writer being already used by the
> servlet..."
> Can anyone help me out...
>
> Regards
> Ray

Read the API documentation
You can't call HttpServletResponse#getWriter() after a call to
HttpServletResponse#getOutputStream()
and there's a good reason for that (more in-depth thought required on your
part).

It is very unclear what you are trying to achieve, so I can't offer a
correct solution.

PS:
catch(java.lang.Exception e) // this piece of code *should* result in
castration (unless the Exception is rethrown) - it's poor form

--
Tony Morris
(BInfTech, Cert 3 I.T.)
Software Engineer
(2003 VTR1000F)
Sun Certified Programmer for the Java 2 Platform (1.4)
Sun Certified Developer for the Java 2 Platform

Hi Tony
Thanks for the response , here is what I am doing,
1) I have an Applet which takes user input as text.
2) From applet it passes simple parameters to the servlet using the
showDocument method showDocument("http://server/webapp/ServletName?text1=text1&text2=text....")
3) The servlet gets the parameters and constructs images out of those
text using customer defined fonts (from Font.createFont() methods)
4)Using PixelGrabber the image is serialized as int[] to the response
stream

Now....
A) After serialization I want to reload the applet so that it
de-serializes the int[] and reconstruct the image (The reconstruction
of image and displaying it on applet is working fine , when i run the
servlet as a standalone (with no user input)), but when I take the
user input ...here is what the problem comes

Regards
Ray
"Tony Morris" <> wrote in message news:<c11ef7$kq0$>...
> "Kim Ray" <> wrote in message
> news: m...
> > Hi All,
> > I am faceing a problem (ofcourse thats what makes all of us come
> > here)..what I am trying to do is , create a image offscreen in a
> > servlet , then using PixelGrabber serialize the int[] and then the
> > applet reads it, ..so far fairly straight, now here...
> > ...
> > ...
> > ObjectOutputStream out = new
> > ObjectOutputStream(res.getOutputStream());
> > System.out.println("Inside isReq after out obj");
> > out.writeInt(w);
> > out.writeInt(h);
> > out.writeObject(pixels);
> > }
> > /**
> > try{
> > res.setContentType("text/html");
> > printer=res.getWriter();
> > printer.println("Object Writing done");
> > printer.close();
> > }catch(Exception ex){}
> > }
> > else{
> > printer.println("Object Writing <b>Not</b> done");
> > printer.close();
> > }**/
> >
> > After Object writing is being done , I wish to display a html page
> > (with applet embedded) but using the above code it is giving me a
> > error "IllegalStateException: Writer being already used by the
> > servlet..."
> > Can anyone help me out...
> >
> > Regards
> > Ray
>
> Read the API documentation
> You can't call HttpServletResponse#getWriter() after a call to
> HttpServletResponse#getOutputStream()
> and there's a good reason for that (more in-depth thought required on your
> part).
>
> It is very unclear what you are trying to achieve, so I can't offer a
> correct solution.
>
> PS:
> catch(java.lang.Exception e) // this piece of code *should* result in
> castration (unless the Exception is rethrown) - it's poor form

"Kim Ray" <> wrote in message
news: om...
> Hi Tony
> Thanks for the response , here is what I am doing,
> 1) I have an Applet which takes user input as text.
> 2) From applet it passes simple parameters to the servlet using the
> showDocument method
showDocument("http://server/webapp/ServletName?text1=text1&text2=text....")
> 3) The servlet gets the parameters and constructs images out of those
> text using customer defined fonts (from Font.createFont() methods)
> 4)Using PixelGrabber the image is serialized as int[] to the response
> stream
>
> Now....
> A) After serialization I want to reload the applet so that it
> de-serializes the int[] and reconstruct the image (The reconstruction
> of image and displaying it on applet is working fine , when i run the
> servlet as a standalone (with no user input)), but when I take the
> user input ...here is what the problem comes
>
> Regards
> Ray
> "Tony Morris" <> wrote in message
news:<c11ef7$kq0$>...
> > "Kim Ray" <> wrote in message
> > news: m...
> > > Hi All,
> > > I am faceing a problem (ofcourse thats what makes all of us come
> > > here)..what I am trying to do is , create a image offscreen in a
> > > servlet , then using PixelGrabber serialize the int[] and then the
> > > applet reads it, ..so far fairly straight, now here...
> > > ...
> > > ...
> > > ObjectOutputStream out = new
> > > ObjectOutputStream(res.getOutputStream());
> > > System.out.println("Inside isReq after out obj");
> > > out.writeInt(w);
> > > out.writeInt(h);
> > > out.writeObject(pixels);
> > > }
> > > /**
> > > try{
> > > res.setContentType("text/html");
> > > printer=res.getWriter();
> > > printer.println("Object Writing done");
> > > printer.close();
> > > }catch(Exception ex){}
> > > }
> > > else{
> > > printer.println("Object Writing <b>Not</b> done");
> > > printer.close();
> > > }**/
> > >
> > > After Object writing is being done , I wish to display a html page
> > > (with applet embedded) but using the above code it is giving me a
> > > error "IllegalStateException: Writer being already used by the
> > > servlet..."
> > > Can anyone help me out...
> > >
> > > Regards
> > > Ray
> >
> > Read the API documentation
> > You can't call HttpServletResponse#getWriter() after a call to
> > HttpServletResponse#getOutputStream()
> > and there's a good reason for that (more in-depth thought required on
your
> > part).
> >
> > It is very unclear what you are trying to achieve, so I can't offer a
> > correct solution.
> >
> > PS:
> > catch(java.lang.Exception e) // this piece of code *should* result in
> > castration (unless the Exception is rethrown) - it's poor form

If that is the case, simply use two servlets to perform each task - the
applet should request from each individually.

--
Tony Morris
(BInfTech, Cert 3 I.T.)
Software Engineer
(2003 VTR1000F)
Sun Certified Programmer for the Java 2 Platform (1.4)
Sun Certified Developer for the Java 2 Platform