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The hibernate mapping/POJO wizards do a full run through all tables/views/procedures in the selected schema each time the wizard is run. This can take some time on schemas containing hundreds or even thousands of tables/views. An optional name filter could be implemented so the wizard only queries the schema for matching names rather than the entire catalog.
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