-dain
On Tuesday, November 26, 2002, at 01:29 PM, Scott M Stark wrote:
Ok, I finally got a handle on the IllegalAccessError that has been reported for a
while now and have a trivial testcase that demonstrates the problem. See the
bug details here:
[ 644289 ] ClassLoader issue with protected access and manifest refs
http://sourceforge.net/tracker/ index.php?func=detail&aid=644289&group_id=22866&atid=376685
The real problem is the use of a UCL per jar for deployments. Because the java URLClassLoader
keeps track of the Class-Path reference in the jar it owns, when more than one jar references
a common jar the UCLs associated with the referencing jars are candidates for the defining
class loader for the classes in the common jar. Effectively this means that the common jar classes
are deployed multiple times even though only a single instance of a given class is created due to
the ULR caching.
I think the simplest fix is to introduce a common class loader associated with the parent deployment
that contains the union of all jars contained in the deployment. In addition to solving this problem
it also helps with issues of duplicates classes in a deployment since with a single class loader
an ordering of the jars can be specified.
I'm working on this issue in main and will backport fixes to 3.2 and 3.0
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Scott Stark
Chief Technology Officer
JBoss Group, LLC
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