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From "V. W. (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1858) ClassDescriptor ReflectionUtils ClassLoader Defect
Date Sat, 15 Nov 2008 19:17:50 GMT
ClassDescriptor ReflectionUtils ClassLoader Defect
--------------------------------------------------

                 Key: JCR-1858
                 URL: https://issues.apache.org/jira/browse/JCR-1858
             Project: Jackrabbit
          Issue Type: Bug
          Components: jackrabbit-ocm
    Affects Versions: 1.4
         Environment: JVM 1.6.0.6/Windows XP SP2/Netbeans 6.2 Beta
            Reporter: V. W.


I have stumbuled on a bug in the interaction between ClassDescriptor and ReflectionUtils classes:
1. ClassDescriptor.validateClassName() uses ReflectionUtils.forName(String) to resolve an
annotated class by its name
2. ReflectionUtils is an evil stateful statics-based singleton. It has a field of a ClassLoader,
which by default is the one that loaded the ReflectionUtils. The method forName(String) uses
this ClassLoader to resolve the annotated class.

The problem is that the ClassDescriptor assumses that the annotated class comes from a global
ClassLoader (the one that loaded the jars), which is not always correct. The workaround is
to manually set the ReflectionUtils ClassLoader field for it to use the correct ClassLoader.

I've found this bug while working with NetBeans, writing a small Scala application and using
ScalaTest TestNG integration for testing. Apparantly many ClassLoader need to by involved
to run a single test.

I've created a unit test (java only, libraries included) to reproduce the bug.

The best solution would be for the ClassDescriptor to use a Class reference (the Class contains
its ClassLoader reference) instead of just a class-name or at least pair every class-name
with its ClassLoader.


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