Java EE App with plug-ins

Hi,
We have an existing enterprise application that has a number of extension points for various aspects of functionality. Clients can supply implementation classes as extension jars and the application will discover these using the standard java service loader mechanism. The extension implementations need to be loadable by the application classloader and also need to access classes within the application.
In OC4J, we used to extend the application library path to include an external directory, in addition to the lib directory within the ear. This allowed users to simply drop in a new jar and restart the application for it to be available. In other app servers we have cheated slightly and added them to the system classpath, which is fine since they have visibility of the application's classpath.
Weblogic does not have the ability to modify the application library path to an external directory, so the only solution we've found so far is to ask users to add their extensions directly to the ear and redeploy the ear. This isn't particularly satisfactory, since extensions often require redeployment much more frequently than the main application and some users see this as creating a derivative of the application rather than a simple extension.
We've considered the use of shared libraries, but this makes the overall installation process more complex and would require moving a lot of the application logic into shared libraries. In some cases, extensions rely on functionality in ejbs, which can't be moved out into the shared libraries.
Does anyone have any better solutions for allowing users to extend enterprise applications through plugins like this?
Regards,
Mark Howard

After he sends it to me (on CD or via a server) I have to find that metadata in my Bridge. Is there an application out there?
Adobe Lightroom is not a very expensive application and the ratings applied by LR are respected by Adobe Bridge. I tried Aperture (Mac, also very cheap) but I am not very familiar with both LR and Aperture and while the files from LR when imported from the folder I used in Bridge where also updated in Bridge I. The rating applied in Aperture is also respected by Bridge but I had to export a version, don't know a fast way but if you manage to find out yourself this might be an option for you.
If you have a real business with many files and need to use this often I know that Canto Cumulus has a client version to look at the files for sorting etc but that is for the full version that doesn't com cheap for you but probably will leave you with clients that are very satisfied...

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<snip>
the start of the region. So, when this region starts
at measure 5 I hear this crackle noise somewhere in
measure 4 (also in the bounce). And here is the most
stupid workaround!! I have to place a dummy region
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Java EE App with plug-ins

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