Re: [aspectj-users] catching container managed transactions

[<andymorton@xxxxxxxxxxxxxx>]

Dean,

The 'onMessage' method is called as soon as a message hits a jms queue, so it would be a 3rd party jar that I dont want to modify.

I'll try the execution thing as see how i go.

Many thanks again!

Andy

----- Original Message ----
From: Dean Wampler <dean@xxxxxxxxxxxxxxxxxxxxx>
To: aspectj-users@xxxxxxxxxxx
Sent: Monday, 29 September, 2008 2:00:48 PM
Subject: Re: [aspectj-users] catching container managed transactions

Who calls the "onMessage" method? If you use the "call" pointcut designator, AspectJ has to be able to weave the handler "advice" into the code that does the calling. If that code is in a third-party jar that you don't want to modify, then use "execute" instead:

pointcut handleException(Message m):

execution(* myBean.onMessage(Message)) && args(m);

dean

On Sep 29, 2008, at 7:55 AM, <andymorton@xxxxxxxxxxxxxx> wrote:

Ok,

Ive changed this to match the following

pointcut handleException(Message m):Â

call (* myBean.onMessage(Message)) && args(m);

after(Message m) throwing (Exception ex): handleException(m)Â

{

//handle exception here

}

However, the pointcuts doesnt seem to get matched... have I got this all wrong?

I want to be able to access the message inside the handler, prefereably.

Andy

----- Original Message ----
From: Dean Wampler <dean@xxxxxxxxxxxxxxxxxxxxx>
To:Âaspectj-users@xxxxxxxxxxx
Sent: Monday, 29 September, 2008 1:21:14 PM
Subject: Re: [aspectj-users] catching container managed transactions

Andy,

A little more information you might find useful. Since you print a message with the exception, you'll need to "bind" it with the "throwing":

after() throwing(Exception ex): mypointcut() {

System.out.println("Error here, guv" + e);

}

Also, just to be clear, if you actually wanted to recover from the exception, you can't do that with after throwing. The exception will still get thrown up the stack. To recover, you would have to use around advice.

dean

On Sep 29, 2008, at 7:00 AM, <hermod.opstvedt@xxxxxxxxx> wrote:

Hi

Â

You are using an around advice:

Â

void around(Message m) throws Exception: handleException(m)

{

try

{

proceed(m);

}

catch(Exception e)

{

System.out.println("Error here,guv "+e);

throw e;

}

}

Â

the alternativ is using an after advice with a throwing clause. That means that the advice is only executed if your pointcut throws an exception.

Â

after() throwing: mypointcut() {

//handle exception here

}

Â

mvh
Hermod

Â

---

From:Âaspectj-users-bounces@xxxxxxxxxxxÂ[mailto:aspectj-users-bounces@xxxxxxxxxxx]ÂOn Behalf OfÂandymorton@xxxxxxxxxxxxxx
Sent:ÂMonday, September 29, 2008 1:37 PM
To:Âaspectj-users@xxxxxxxxxxx
Subject:ÂRe: [aspectj-users] catching container managed transactions

Im not sure i follow, can you give a quick 1-liner example, or point me to a relevant doco?

thanks.

Andrew

----- Original Message ----
From: "hermod.opstvedt@xxxxxxxxx" <hermod.opstvedt@xxxxxxxxx>
To:Âaspectj-users@xxxxxxxxxxx
Sent: Monday, 29 September, 2008 9:55:30 AM
Subject: RE: [aspectj-users] catching container managed transactions

Hi

Â

Why don't you use "after returning throwing" instead of around advice.

Hermod

Â

---

From:Âaspectj-users-bounces@xxxxxxxxxxxÂ[mailto:aspectj-users-bounces@xxxxxxxxxxx]ÂOn Behalf OfÂandymorton@xxxxxxxxxxxxxx
Sent:ÂMonday, September 29, 2008 10:31 AM
To:Âaspectj-users@xxxxxxxxxxx
Subject:Â[aspectj-users] catching container managed transactions

Hi

I have a message driven bean which, inherently, throws an exception back to the container to rollback jms messsages.

I want to be able to catch this exception, log something, and then let the exception carry on.

I have a pointcut defined as follows:

pointcut handleException(Message m):Â

call (* myBean.onMessage(Message)) && args(m);

With the advice being:

void around(Message m) throws Exception: handleException(m)

{

try

{

proceed(m);

}

catch(Exception e)

{

System.out.println("Error here,guv "+e);

throw e;

}

}

My question is two-fold:

1) Can we throw the exception like this and will the throw go back to the container managed transaction??

2) ÂIs this the right way to do this kind of thing? (im assuming not, as the advice is marked as 'Not matched', but maybe this is one for the ajdt guys.)

Sorry - im completely new to this stuff....

Regards,

Andy

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_______________________________________________
aspectj-users mailing list
aspectj-users@xxxxxxxxxxx
https://dev.eclipse.org/mailman/listinfo/aspectj-users

Dean Wampler, Ph.D.

dean at objectmentor.com

http://www.objectmentor.com

See also:

http://www.polyglotprogramming.com ÂMulti-language and multi-paradigm programming

http://www.aspectprogramming.com  ÂAOP advocacy site

http://aquarium.rubyforge.org    AOP for Ruby

http://www.contract4j.org      Design by Contract for Java5

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