[aspectj-users] Exception Handling

[Leonardo Machado Moreira]

Hi everyone

I am new at AspectJ and came to it because I want to implement an Exception
Handling like this from Spring Rich Client.

http://spring-rich-c.sourceforge.net/1.0.0/spring-richclient-manual/reference/html/exception-handling.html

I was thinking about the ways to do It, and you tell me if it is possible
and if I am going the right way.

The first thing is to soft the checked exceptions

like

declare soft : Exception : execution(* *.*(..));


So afterwards I shoud put an point cut  on every application methods doing
things like this?


void around() : call(* *.*(..)) {
        try {
            proceed();
        } catch (Exception e) {
            //Get Interface from Sping Context and Run It
            //business action or view , etc
        }
}


This was what I thought after some searchs but I am still thinking it is not
right, or the better way. Mainly because I would have to put as many
exceptions as I would need, like

void around() : call(* *.*(..)) {
        try {
            proceed();
        } catch (SomeSQLExcep e) {
            //Get Interface from Sping Context and Run It
            //business action or view , etc
        } catch (SomeHibernateExcep e) {
            //Get Interface from Sping Context and Run It
            //business action or view , etc
        } catch (AnyExcep e) {
            //Get Interface from Sping Context and Run It
            //business action or view , etc
        }
}

So I think it is not the best option.

Searching a little more I found a code that runs after an exception is
thrown

after() throwing(SoftException t): scope() {
        System.out.println("Logado pelo Aspecto - (Soft) ");
    }


What would be the code that runs before it? How to intercept it?

I think If I could do something like this for example

before() throwing(SQLException t): scope() {
        //Get from Spring and run
    }


In the spring could be anything like showing a JSF message to the user or
anything.

I think that only detailed exceptions could be managed like this right? If I
put some generic Code like Exception, all the system would be intercepted
and it is not the better move.

I am not really sure if I made myself clear and my doubts.

The first thing I would like to know if what I am trying to do is possible
and if I am going in the right way?

Thanks a lot

Leonardo Moreira

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