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From "Lambert, Mark " <mlamb...@nationalinfo.com>
Subject RE: java.lang.ClassFormatError when running in Java 1.5
Date Mon, 18 Oct 2004 20:08:53 GMT

> -----Original Message-----
> From: Felipe Leme [mailto:maven@felipeal.net] 
> Sent: Sunday, October 17, 2004 2:07 PM
> To: Cactus Users List
> Subject: Re: java.lang.ClassFormatError when running in Java 1.5
> Mark,
> If this bug is just a matter of updating Aspectj's version, I 
> could do the change.
> But I'd rather understand what's exactly this bug and how to 
> reproducite it first. So, could you please provide more info, 
> preferably on Jira?

I put a brief update in http://nagoya.apache.org/jira/browse/CACTUS-129

In short, AspectJ is creating a static method and including a reference
to _this_ in it's variable table.  Java 1.5 is more strict than earlier
versions and catches this as an error.

In longer from the AspectJ bug report:
The answer is that in AspectDeclaration.generateMethod() where we are 
generating the code for static methods like aspectOf(), hasAspect(), etc
- we 
are using the codeStream object incorrectly.  We are calling
rather than codeStream.reset().  Not using reset() means that we don't
the method declaration object that the code stream thinks it is working
This means that when we ask the classfile to fix up its code attributes 
(around line AspectDeclaration line 306 we call
()) the classfile asks the methoddeclaration for the codestream whether
it is 
static - based on the result of this check, it generates a local
table entry for 'this' (See line 1413 in ClassFile).  Because we never
the codestream with a new method declaration, it still points to the
declaration for our previous created method - the advice itself (public
ajc$before$A$50();) - this was *not* static and so we end up creating a
local variable entry for all the subsequent generated methods in the

"A man of my acquaintance once wrote a poem called 'The Road Less
Traveled,' describing a journey he took through the woods along a path
most travelers never used. The poet found that the road less traveled
was peaceful but quite lonely, and he was probably a bit nervous as he
went along, because if anything happened on the road less traveled, the
other travelers would be on the road more frequently traveled and so
couldn't hear him as he cried for help. Sure enough, that poet is now
dead." --Lemony Snicket

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