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From Alessio Fiore <afi...@alteanet.it>
Subject R: How to add a throw exception to a servlet
Date Fri, 03 May 2002 10:16:17 GMT
Hi Raphael, you could use an intermediate base servlet in your app,
something like:

public abstract class BaseServlet extends HttpServlet
 {
  public void doPost(HttpServletRequest request,
		         HttpServletResponse response)
   throws ServletException, IOException
   {
    try
     {
      doPostInternal(request,response);
     }
    catch(Exception e)
     {
      request.setAttribute("my_servlet_exception",e);
	//forward request to error.jsp using a dispatcher
     }
   }

  protected abstract void doPostInternal(HttpServletRequest request,
						     HttpServletResponse
response)
   throws Exception;
 }


Your selectdetail class (better SelectDetail) will become:

public class selectdetail extends BaseServlet
 {
  protected void doPostInternal(HttpServletRequest request,
				        HttpServletResponse response)
   throws Exception
   {
    //Do something, throwing SQLException if a DB error occours.
   }
 }


And your error.jsp will read "my_servlet_exception" attribute from the
request and will manage it.


Regards
Alessio


-----Messaggio originale-----
Da: Chetan Wagle [mailto:chetan.wagle@capstoneit.com]
Inviato: venerdì 3 maggio 2002 11.07
A: Tomcat Users List
Oggetto: Re: How to add a throw exception to a servlet


Hi Raphel,

    Can you let me know why you have this peculiar requirement of 
changing the signature of the doPost method ?

Rgds,
Chetan

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Chetan Wagle
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Raphael wrote:

>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>The doPost method of a servlet looks like this :
>
>public class selectdetail extends HttpServlet {
>    public void doPost(HttpServletRequest request,
>		       HttpServletResponse response)
>	throws ServletException, IOException {
>
>What if in my doPost method I am using Object methods that throw other 
>exceptions, like SQLException. The Java compiler would not let me write :
>
>public void doPost(HttpServletRequest request,
>		       HttpServletResponse response)
>	throws ServletException, IOException,SQLException
>
>But I want the exception to be caught in the error.jsp page, not do a try 
>{...} catch{...} inside the doPost body.
>
>I don't know if I explained it correctly but is there a simple solution to 
>this problem ?
>-----BEGIN PGP SIGNATURE-----
>Version: GnuPG v1.0.6 (GNU/Linux)
>Comment: For info see http://www.gnupg.org
>
>iD8DBQE80Sfrh2ITK4xBkFERAgMfAJ95HwnlLTICnfOeOrK33jifllqhtACdFrXN
>xtFJ/YRjwGEqQNESeKRTrAE=
>=IMF1
>-----END PGP SIGNATURE-----
>
>
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