Dear Himanshu
While you reply ...use reply all ...as it is in my to list
.Try it out and lemme know.Also we can discuss separately
..U can mail me if you have problems.
[Agarwal Gokul]
> -----Original Message-----
> From: Agarwal Gokul [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, September 28, 2000 2:39 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Lets talk about good exception handling!
> Importance: High
>
> Hi
> I have installed tomcat 3.0 ..Now I am unable to compile my servlets ..How
> do I go about it..Please help me out..Also a hello to all
> from me as this is my first query to the servlet-interest group.
> Regards
> Gokul Kr Agarwal
>
> > -----Original Message-----
> > From: Nic Ferrier [SMTP:[EMAIL PROTECTED]]
> > Sent: Thursday, September 28, 2000 12:24 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Lets talk about good exception handling!
> >
> > >>> Marc Krisjanous <[EMAIL PROTECTED]> 28-Sep-00 5:24:33 AM
> > >>>
> >
> > >Now, the perfromTask method throws an
> > >ExceptionController(extends Exception)
> > >instance which is caught in the doGet or doPost methods.
> > >Then I currently send the error back to the web browser.
> > > The question is: is this good exception handling??
> >
> > It's perfectly acceptable.
> >
> > Personally I'd do the work that performTask does inside service() and
> > catch all the different exceptions seperately.
> >
> > The thing is that you can't use a formula for exception handling...
> > it's down to what you want to do at the time and in the
> > circumstances:
> >
> > - handle any exception that could be produced in the same way...
> > - handle particular bits of code with special handlers
> > - handle all exceptions specifically
> >
> > This is judgement... if you think hard about what you want to do now
> > it'll come and it'll get easier.
> >
> > Something that can help is looking at good free software (open source
> > code) to see how the pros do it.
> >
> >
> > Here's a few pointers, but even these can't be taken too literally:
> >
> > - always catch Throwable not Exception for generic exceptions
> > Throwable is actually the lowest exception... if you just catch
> > Exception your code will blow up if it gets a Throwable
> >
> > - for small code use a single try/catch with specific exception
> > handlers
> >
> > - for larger code use a try/catch around code that might blow up
> >
> > - use the ServletContext.log method that allows writing stack traces
> > to the log
> >
> > - with servlets think hard about the link between an exception and an
> > HTTP error
> > is it a 500? a 501? a 400? what?
> >
> >
> > Lastly, here's a code fragment that you can use to print stack traces
> > to an html page.
> >
> > The Throwable is called: t.
> > The Writer connected to the response is called: m_out
> >
> > //we need to do this to collect the stacktrace lines
> > StringWriter buf=new StringWriter();
> > PrintWriter stackout=new PrintWriter(buf);
> > t.printStackTrace(stackout);
> > //create the tokenizer to get each line of input
> > StringTokenizer st=new
> > StringTokenizer(buf.getBuffer().toString(),"\n");
> > while(st.hasMoreTokens())
> > {
> > m_out.println(st.nextToken());
> > m_out.println("<br>");
> > }
> > m_out.println("</p>");
> >
> > This can be usefull... eg: I use it when I get something that I class
> > as a 500.
> >
> >
> > Nic
> >
> >
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