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nb4.0 beta2 "web project with existing sources" wizard: "java sources" is a mandatory input. But in reality there are webapps that do not have any java classes but only JSP pages. So "java sources" should not be a mandatory input.
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