[news.eclipse.platform.rcp] Classpath problem when exporting RCP app

[Martin <address.starts.after.hyphen-martin.umgeher@xxxxxxxxxxx>]

Hi,

my RCP app consists of a functionality plug-in and an 
application-launching plug-in. The former depends on an external .jar 
file I added to the project's Java Build Path. Now I want to export the 
application as an eclipse product. I added the .jar to Extra Classpath 
Entries in plugin.xml and had to remove it from the Java Build Path 
(double referencing -> build error). Now I can export my product without 
errors, but the .jar is not exported to the .zip file; so when my code 
uses a class from the .jar a NoClassDefError is thrown. The same happens 
when I run the app from within eclipse with the launch config that used 
to work prior to the changes described above.

I guess I've done something wrong, added the .jar in the wrong place or 
something like that. Can anyone give me advice on this?

Thanks & regards,
Martin