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When you have a project B that depends on a project A, and the project A has some libraries (.jar, libraries, folders) the project B must have it too in order to run. Should be transparent when you add the project A to the libraries of the project B, all the dependencies of A must be copied to the class path of the project B. At least at the first add. Will be great if the project A adds new libraries the project B copies that libraries too.
The features for NB 6.8 are already closed.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss