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[ JDK VERSION : 1.6.0_07 ] After importing some libraries into the project (by selecting a libraries folder), there is no way to delete them. I can only remove the reference to them from the project, but they remain in the lib folder and a reference to them is maintained in nblibraries.properties. This can be annoying when someone is importing the lib directory into version control (and this is why the this funcion exists in the first place - to share the libraries). I'm proposing presenting presenting a user with the option to delete the files when removing a library from the project.
Change of default owner.
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