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It's valid to registrate Web Application Listener in taglib as described in jsp2_1 specification chapter JSP.7.1.9 . We are offering possibility to register listener in web.xml Descriptor, but we should also offer a possibility to register lintener is Tag Library.
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