class export feature does not work in all cases
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Key: CDV-598
URL: https://jira.terracotta.org/jira//browse/CDV-598
Project: Community Development
Issue Type: Bug
Components: Byte Code Transform
Affects Versions: 2.5.0
Reporter: Tim Eck
Assignee: Issue Review Board
The DSO client (and the TIMs it contains) can "export" classes to application
level classloaders. The implementation is essentially a VM wide map that
provides URL sources for specific classnames. Inside of the base
java.lang.ClassLoader class, we add a hook which consults this map whenever
classes are being loaded. If there is an entry present in our map, then we use
the URL source to get the bytes and define the class in the initiating loader.
Our hook is present in ClassLoader.loadClassInternal() however (the VMs entry
point for implicit class loading). For explicit loading via loadClass(..), the
hook for export is not invoked.
This isn't simpy a matter of just moving the hook though. loadClassInternal()
has the nice feature that it only called once per class to load (this is not
true of loadClass). The other thing about loadClass() is that it can (as
frequently is overridden in loader subclasses).
The workaround for code that wants to explicit class loads *and* needs to see
"exported" classes is to use Class.forName(String, boolean, ClassLoader)
instead of loadClass(..)
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