[aspectj-users] [newbie] Exception handling - why doesn't this work?

["Jerry Jalenak" <Jerry.Jalenak@xxxxxxxxxx>]

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


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