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Project properties dialog should provide common validation functionality similar to the wizards. Now there is no validation mechanism in the project properties dialog so if the developer wants to validate some values, it is necessary to implement it from scratch in each panel. This issue is also related to the issue #28862.
ProjectCustomizer.Category class has validation switch and error message setter. What's wrong with that?
Oh, interesting. I didn't know that it was implemented. When we implemented customizers for J2EE projects this functionality was missing there. I was talking about it a few times with UI but nothing happened so I decided to report it after ages myself and now I see it was already implemented (I don't read each commit message to each module). I'm sorry for false alarm and thanks for implementing it.