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RE: [aspectj-users] [newbie] Exception handling - why doesn't thi s work?
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Continuing this thought....
Is it possible to write an pointcut that will catch both checked and
unchecked exceptions, but allow them to continue once the advice is
complete? I working on a generic tracing aspect and want to be able to
trace exceptions if and when they are thrown, but then allow the exception
to continue and potentially be caught by another aspect that will actually
handle the exception.
Any thoughts?
Thanks...
Jerry Jalenak
Development Manager, Web Publishing
LabOne, Inc.
10101 Renner Blvd.
Lenexa, KS 66219
(913) 577-1496
jerry.jalenak@xxxxxxxxxx
> -----Original Message-----
> From: Ron Bodkin [mailto:rbodkin@xxxxxxxxxxxxxx]
> Sent: Wednesday, July 14, 2004 10:37 AM
> To: aspectj-users@xxxxxxxxxxx
> Subject: Re: [aspectj-users] [newbie] Exception handling - why doesn't
> this work?
>
>
> Hi Jerry,
>
> Your code will work if you remove the throws clause from the
> call pointcut descriptor, i.e.,
> change to
> declare soft : ArithmeticException :
> call(* *.*(..)) && within(HelloWorld);
>
> The expression call(* *.*(..) throws ArithmeticException)
> matches method call join points where
> the method being called is statically declared to throw
> exceptions of type ArithmeticException
>
> But ArithmeticException is an unchecked exception. And the
> JDK method calls that throw it do not declare it as part of
> their signature; it is not required to say a method throws
> unchecked exceptions, although it is allowed. I.e., the
> following are equivalent and both are valid Java code:
>
> void foo() throws RuntimeException {
> throw new RuntimeException();
> }
>
> void foo() {
> throw new RuntimeException();
> }
>
> However call(* *(..) throws RuntimeException) would only
> match calls to the first version.
>
> But why are you softening an exception that is already
> unchecked? Why not leave out the declare soft and just use
> after throwing advice on the ArithmeticException, e.g.,
>
> aspect ExceptionHandler
> {
> after() throwing(ArithmeticException ex) :
> call (* *(..)) && within(HelloWorld)
> {
> System.out.println("exception is " + ex.getMessage());
> }
> }
>
> Ron Bodkin
> Chief Technology Officer
> New Aspects of Software
> o: (415) 824-4690
> m: (415) 509-2895
>
> > ------------Original Message------------
> > From: "Jerry Jalenak" <Jerry.Jalenak@xxxxxxxxxx>
> > To: "'aspectj-users@xxxxxxxxxxx'" <aspectj-users@xxxxxxxxxxx>
> > Date: Wed, Jul-14-2004 6:27 AM
> > Subject: [aspectj-users] [newbie] Exception handling - why
> doesn't this work?
> >
> > Hi all,
> >
> > I'm in the processing of learning AspectJ, and am excited about the
> > possibilities it offers - one of which is the abililty to
> abstract out
> > exception handling into a common aspect. I've written up a
> real simple
> > java
> > program and aspect to catch a divide by zero exception, but I can't
> > seem to
> > get it to work. Here's the code :
> >
> > public class HelloWorld
> > {
> >
> > public static void main(String[] args)
> > {
> > helloWorld();
> > }
> >
> > private static void helloWorld()
> > {
> > int a = 10 / 0;
> > }
> > }
> >
> > aspect ExceptionHandler
> > {
> > declare soft : ArithmeticException :
> > call(* *.*(..) throws ArithmeticException) &&
> > within(HelloWorld);
> >
> > after() throwing(SoftException ex) :
> > (execution (* HelloWorld.*(..)) && within(HelloWorld))
> > {
> > System.out.println("exception is " +
> > ex.getWrappedThrowable().getMessage());
> > }
> > }
> >
> > When I run this (under Eclipse) I get the following messages in the
> > console
> > window :
> >
> > java.lang.ArithmeticException: / by zero
> > at org.labone.HelloWorld.helloWorld(HelloWorld.java:20)
> > at org.labone.HelloWorld.main(HelloWorld.java:15)
> > Exception in thread "main"
> >
> > It appears that the aspect is never being invoked. What am I doing
> > wrong?
> >
> > Thanks!
> >
> > Jerry Jalenak
> > Development Manager, Web Publishing
> > LabOne, Inc.
> > 10101 Renner Blvd.
> > Lenexa, KS 66219
> > (913) 577-1496
> >
> > jerry.jalenak@xxxxxxxxxx
> >
> >
> > This transmission (and any information attached to it) may be
> > confidential and
> > is intended solely for the use of the individual or entity
> to which it
> > is
> > addressed. If you are not the intended recipient or the person
> > responsible for
> > delivering the transmission to the intended recipient, be
> advised that
> > you
> > have received this transmission in error and that any use,
> > dissemination,
> > forwarding, printing, or copying of this information is strictly
> > prohibited.
> > If you have received this transmission in error, please immediately
> > notify
> > LabOne at the following email address:
> > securityincidentreporting@xxxxxxxxxx
> >
> > _______________________________________________
> > aspectj-users mailing list
> > aspectj-users@xxxxxxxxxxx
> > http://dev.eclipse.org/mailman/listinfo/aspectj-users
> >
> >
>
> _______________________________________________
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>
This transmission (and any information attached to it) may be confidential and is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient or the person responsible for delivering the transmission to the intended recipient, be advised that you have received this transmission in error and that any use, dissemination, forwarding, printing, or copying of this information is strictly prohibited. If you have received this transmission in error, please immediately notify LabOne at the following email address: securityincidentreporting@xxxxxxxxxx
