Re: Help with using declarative error handling

[Frank Burns]

Hi Wendy,

Thanks for your reply. I know that what you suggest is a solution.

But I don't understand why what I originally tried doesn't work, which is to
add some code in the catch block, before rethrowing it, for example like
this:

  } catch(TrcDatabaseException ex){
   /* add relevant action errors */
   ActionErrors errors = new ActionErrors();
   errors.add(ActionErors.GLOBAL_ERROR, new
ActionError("errors.database.noconnection"));
   saveErrors(request, errors);
   /* rethrow the exception to be caught by Struts declarative exception
handling mechanism */
   throw ex;
  }

and have <html:errors/> display it in the JSP that is forwarded to.

This seems simple enough. So why doesn't it work?

Any ideas why it doesn't?

Cheers,

Frank

----- Original Message ----- 
From: "Wendy Smoak" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Tuesday, May 18, 2004 12:01 AM
Subject: RE: Help with using declarative error handling


> From: Frank Burns [mailto:[EMAIL PROTECTED]
> However, the problem I am trying to solve is that my
> AuthenticateAction
> class can throw the TRCDatabaseException in SEVERAL places.
>
> I want to be able to display a DIFFERENT error message for
> each place in the
> code where the exception can occur.

What about subclassing TRCDatabaseException and making different
exceptions for the different bad things that can happen?

For example, I have a generic "DAOException", and beneath that,
RecordNotFoundException, RecordLockedException, etc.

Then throw the exception that describes what really happened, and let
Struts do its thing.

-- 
Wendy Smoak
Application Systems Analyst, Sr.
ASU IA Information Resources Management

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Hi,

I can't get the relevant error message from the resources file to display
when an exception is thrown.

Can you please help? Here is the scenario:

One of my Action classes, AuthenticateAction, can generate the same type of
application-specific exception (TrcDatabaseException) at various points in
its code.

I want to display error-specific information for each place where the
TrcDatabaseException can be thrown in the AuthenticateAction.

Wherever an exception is thrown in AuthenticateAction, I add some code in
the catch block, before rethrowing it, for example like this:

  } catch(TrcDatabaseException ex){
   /* add relevant action errors */
   ActionErrors errors = new ActionErrors();
   errors.add(ActionErors.GLOBAL_ERROR, new
ActionError("errors.database.noconnection"));
   saveErrors(request, errors);
   /* rethrow the exception to be caught by Struts declarative exception
handling mechanism */
   throw ex;
  }

I have also placed an errors.database.noconnection in the resource file.

In the struts-config file, for the AuthenticateAction, I have defined an
exception element:

<exception
    key="errors.generalmessage"
    type="mydomain.exception.TrcDatabaseException"
    path="/common/exceptionTrcDatabase.jsp"
    />

I have created a JSP, exceptionTrcDatabase.jsp, that contains this element:

    <html:errors/>

However, whenever I test this code (by deliberately creating the relevant
error conditions), only the errors.generalmessage is displayed.

Why isn't the errors.database.noconnection being displayed as well?

Thanks,

Frank.


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