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I noticed this today when using the ebay library. They do not provide the source for one of their packages presumably because it's generated. Anyway, I setup a netbeans library with the jar and set the source to the source folder. The IDE finds all packages except for the package that does not have source even though the package is in the jar file associated with the library. The project will compile correctly but the editor indicates that the class is missing. If I remove the source from the library, the editor no longer has a problem. I am using netbeans 6 M10 and I apologize if this is a duplicate. I really did try to find it in the bug list!
Duplicate of fixed issue, should work fine even in beta1. *** This issue has been marked as a duplicate of 57392 ***