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Link: http://services.netbeans.org/synergy/client/app/#/case/1378/suite/1775 tooltip is rendering "No output",it is not show rendering the methods.
I cannot reproduce in Product Version: NetBeans IDE Dev (Build 20150916-f0906e87e3c8). Both ant and maven projects show the expected tooltips. Please try a latest build and reopen if it still happens for you. Thank you for reporting