[equinox-dev] ClassLoader Issue - org.eclipse.osgi.internal.baseadaptor.

[Tze-John Tang <tze-john.tang@xxxxxxxxxx>]

I am developing plug-ins for an application
that is written on top of the Eclipse framework.  I am seeing different
behavior in class loading when I am running the application through the
Eclipse dev environment, and when I run it stand alone.  Within Eclipse,
when the plug-in uses the JAXP parser, the classes in org.apache.xerces.jaxp
are used.  When running stand alone, it appears that the com.sun.org.apache.xerces.internal.jaxp
classes are loaded instead.  I tried specifying the DocumentBuilderFactory
using the META-INF/services/javax.xml.parsers.DocumentBuilderFactory file.
 This file gets picked up when running in Eclipse, but not when the
application is running stand alone.

This led me to look into the class loading
situation.  I am checking the class loader by calling Thread.currentThread().getContextClassLoader().
When running the application in Eclipse,
the loader is org.eclipse.core.runtime.internal.adaptor.ContextFinder.
 When running stand alone, the loader is  org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.
 So, I am guessing that at some point in time, something is changing
the context class loader and maybe I don't see it when I am running in
Eclipse because the bundles are loaded in a different order?  If I
create a bundle activator, and manually start it from the osgi console,
the class loader is still the ContextFinder one, but when the rest of the
plugin is called, through the extension point, the class loader has changed.
 If I set the Activator to activate when a class from the Bundle is
loaded, the class loader at that point has already changed to the DefaultClassLoader
one.

Does anyone have any advice to work around
this issue?  My main issue is that I cannot troubleshoot it when I
am running in Eclipse, because it works fine.

Thanks.

-tj

Tze-John Tang Discovery Informatics Global Pharmaceutical Discovery	Abbott 100 Abbott Park Road Dept. R42T, Building AP10-2 Abbott Park, IL 60064	Phone 847-935-3134 Fax 847-935-0548 tze-john.tang@xxxxxxxxxx
This communication may contain information that is proprietary, confidential, or exempt from disclosure. If you are not the intended recipient, please note that any other dissemination, distribution, use or copying of this communication is strictly prohibited. Anyone who receives this message in error should notify the sender immediately by telephone or by return e-mail and delete it from his or her computer.