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RE: [aspectj-dev] Re: aspectj-dev Digest, Vol 19, Issue 2

Hi Jonghyun,

 

I’ve hit cases where I’ve wanted to do this. There are two good solutions:

1)       Most often you can use the Exception Introduction pattern as Ramnivas Laddad describes in AspectJ in Action: you wrap the exception in an unchecked exception and then unpack it in some receiving type

2)       in odd cases, e.g., for virtual mock object testing frameworks, you can use other techniques to throw checked exceptions and rely on dynamic tests to ensure safety. I believe this should be a last resort, rather like using Java reflections’s setAccessible to access non-public members.

 

This topic has come up before on the AspectJ users mailing list, so a more full discussion can be read at

 

http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg01412.html

http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg01400.html (you can download a direct bytecode implementation of throwing checked exceptions from the aTrack open source project too).

 

HTH,

Ron

 

From: aspectj-dev-bounces@xxxxxxxxxxx [mailto:aspectj-dev-bounces@xxxxxxxxxxx] On Behalf Of Jonghyun Yoon
Sent: Monday, September 04, 2006 5:25 AM
To: aspectj-dev@xxxxxxxxxxx
Subject: [aspectj-dev] Re: aspectj-dev Digest, Vol 19, Issue 2

 

Thank you about your response

 

I am not saying about breaking JLS. What I am saying is totally regal.

Please read my first mail.

For more simple explaination.

 

//original method

someMethod()

 

//advice

around() throws * : call(* *.someMethod()) {

throw new CheckedException();

}

 

//weven method and also illegal if someMethod() can not throw CheckedException

someMethod()

throw new CheckedException()...
 

//but if aspectj compiler make next code,

//it is totally regal because It will never throw checked exception which someMethod() can not throw

try {

  someMethod()

  throw new CheckedException()...

} catch (Throwable t) {

  if (isPointCutCanThrow(t)) {

    throw t

  } else {

    throw new RunTimeException(t);

  }

}

 

 

I hoped there was solution like this. But it seems aspectj does not implement it yet.. 

I hope it will be implemented soon.


 

On 9/4/06, aspectj-dev-request@xxxxxxxxxxx <aspectj-dev-request@xxxxxxxxxxx > wrote:

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Today's Topics:

  1. Re: Can throw arbitrary Checked Exception in around? (Wes)


----------------------------------------------------------------------

Message: 1
Date: Sat, 2 Sep 2006 22:32:43 -0700
From: "Wes" <wes@xxxxxxxxxxxxxx >
Subject: Re: [aspectj-dev] Can throw arbitrary Checked Exception in
       around?
To: "AspectJ developer discussions" <aspectj-dev@xxxxxxxxxxx>
Message-ID: <20060902223243.1136929287.wes@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"


See the documentation of "declare soft".

http://www.google.com/search?q=site%3Awww.eclipse.org+%22declare+soft
http://www.eclipse.org/aspectj/doc/released/progguide/semantics-declare.html
http://www.eclipse.org/aspectj/doc/next/adk15notebook/declare-soft.html

Exception checking is the responsibility of every Java compiler, including AspectJ's.

Wes

------------Original Message------------
From: "Jonghyun Yoon" < ormastes@xxxxxxxxx>
To: aspectj-dev@xxxxxxxxxxx
Date: Sat, Sep-2-2006 6:08 AM
Subject: [aspectj-dev] Can throw arbitrary Checked Exception in around?
Does anyone know how to throw abitrary checked Exception in around?
When I try to write advise which throw arbitrary Exception
It always show me error message can't throw checked Exception 'xxxx'
Only way to throw exception without error is
Object around() throws AnException: call(* *(..) throws AnException)  {
   throw new AnException();
}
But problem is that it must be written to every Exceptions and even it is done
it can not be prevent new Exceptions.
Is there any solution for this problem?
If there isn't, I hope aspectj developer make a solution like this.
when aspecj compiler weaving
suround the advice by try catch block
check throwable can be thrown by target point cut
if it can be thrown by the point cut just rethrow it
if not just wrap it with RuntimeException and throw it.
It may reduce performance but does not brake Java Language Specification and reduce a lot of works.
It will be not a problem if compiler give warning about performance penalty Or only some special grammar allow to throw checked Exceptions(like: Object around() throws * : somePointcut()).
I hope there is some solution already exist but i don't know about it.
Thank you.


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