Error Handling

[Emyr James <em...@OrbisUK.com>]

Dear all,
I'm writing a servlet application using velocity under tomcat. At the moment I'm
doing something like this...

public class MyServlet extends VelocityServlet {
    public Template handleRequest( HttpServletRequest request, HttpServletResponse
response, Context context ){
  Template template=null;
  try {
    //stuff that may throw an error
  } catch( Exception e ) {
   context.put("error",e.toString());
   try {
    template=getTemplate("error.vm");
   } catch( Exception ee ) {
    ee.printStackTrace();
    System.exit(0);
   }
  }
  return template;

I want to make this complete by changing the System.exit(0) stuff to send stuff
back on the servlets output stream directly, circumventing velocity entirely.
How can I get access to this stuff so that the servlet behaves like a typical
servlet under certain circumstances.

Cheers,
Emyr



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Re: Error Handling

["Geir Magnusson Jr." <ge...@adeptra.com>]

On 5/15/02 7:09 AM, "Emyr James" <em...@OrbisUK.com> wrote:

> Dear all,
> I'm writing a servlet application using velocity under tomcat. At the moment
> I'm
> doing something like this...
> 
> public class MyServlet extends VelocityServlet {
>   public Template handleRequest( HttpServletRequest request,
> HttpServletResponse
> response, Context context ){
> Template template=null;
> try {
>   //stuff that may throw an error
> } catch( Exception e ) {
>  context.put("error",e.toString());
>  try {
>   template=getTemplate("error.vm");
>  } catch( Exception ee ) {
>   ee.printStackTrace();
>   System.exit(0);
>  }
> }
> return template;
> 
> I want to make this complete by changing the System.exit(0) stuff to send
> stuff
> back on the servlets output stream directly, circumventing velocity entirely.
> How can I get access to this stuff so that the servlet behaves like a typical
> servlet under certain circumstances.

That's easy :   just use the request/response objects as normal, and return
null.

When the baseclass sees the 'null' returned, it assumes you took care of the
request, and does nothing else.

-- 
Geir Magnusson Jr.
Research & Development, Adeptra Inc.
geirm@adeptra.com
+1-203-247-1713



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