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Very common requirement for any dev-oriented plugin, it seems to be quite complicate to do it. Would be great to have a wizard that would just prompt you for a name, list of JARs on the local filesystem, package them into a module and upon deployment automatically install it under Tools -> Libraries. Typical usage would be when developing a module to add support for a different web framework.
There already exists wizard for creating j2se libraries in templates: New|NetBeans Module Development|J2SE library descriptor. If you are interested in development support for web module development look at Geerjan's weblog: http://blogs.sun.com/geertjan/entry/webframeworkprovider_and_a_new_tutorial