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1/ Create or import a module project (I don't know if it works alike with other project types) 2/ Remove java.source property from project.properties 3/ Go to Project Properties menu 4/ In "Sources" category set "Source Level" to a value The file project.properties will contain javac.sources instead of javac.source.
Good catch. Thanks. Fixed in trunk. Checking in src/org/netbeans/modules/apisupport/project/ui/customizer/NbModuleProperties.java; new revision: 1.2; previous revision: 1.1
By the way please use subcomponent 'project' for all bugs relating to the NBM project type. You can use keyword 'UI' for bugs which pertain to poor (confusing, misleading, awkward, ugly...) UI, but that's not the case here.
verified in current trunk