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Re: [aspectj-users] Why need AspectJ all libraries of my .jar I want to instrument
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This thread tripped something in my memory: an alternate way to do what
Ron suggests, but without the trial and error. So I put the question to
the Tucson JUG:
I rememeber a discussion on this list about tools for JAR slimming:
ditching all the classes in a JAR than can be proved by static
analysis to
be unused by your code. Does anyone else remember this and can they
tell me
what the tools were that accomplished this feat?
Ant's own <classfileset> can do this using BCEL:
<http://ant.apache.org/manual/OptionalTypes/classfileset.html>
And so does GenJar:
<http://genjar.sourceforge.net/>
(Credit for the answer goes to Erik Hatcher, Ant guru). Hope those help
for future problems of this nature.
Cheers,
nick
On Feb 25, 2004, at 7:58 AM, Ron Bodkin wrote:
Michael,
I have done something similar with the TopLink jar. What I did was to
explode the jar and to incrementally strip down to a subset of classes
that referenced the jars I did have. The other classes are never
loaded by my app so by definition I don't need them. I did this by
removing any class files that had references the weaver choked on,
then retrying to weave again, and repeating until there were no
errors. This is a recipe that should work for weaving into any jar
that has references to classes you don't have access to.
This is a case where having weaving classloader support will be very
helpful: you will never need to worry about having unreferenced
classes in the classes you load (since this would also cause the JVM
to throw a class not found exception).
Note that in many cases the weaver does need to resolve references to
external types, so it would be fairly complicated to optimize it to
minimize such dependencies. I think classloader weaving is the way to
go.
Ron
Ron Bodkin
Chief Technology Officer
New Aspects of Software
m: (415) 509-2895
------------Original Message------------
From: Michael Dempfle <mdempfle@xxxxxxxxxx>
To: aspectj-users@xxxxxxxxxxx
Date: Wed, Feb-25-2004 6:50 AM
Subject: [aspectj-users] Why need AspectJ all libraries of my .jar I
want to instrument
Hi,
I want to insert aspects in a .jar file of oc4j.
Unfortunately this jar file is not very consistent and has classes
which ware not used but uses classes which are not available.
When I want to use AspectJ I cannot weave the code
into the other class files because AspectJ is checking everything.
Is it possilbe to remove this check? AspectJ is using BCEL and
therefore there is not need for that!.
Are there any solutions?
Thanks,
Michael Dempfle
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