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I have found a following bug: 1.) Create an empty Java Based Maven project using NetBeans running on JDK7 (in that case JDK7 will be selected as default platform for the maven project as well) 2.) Change the Java Platform to JDK6 and click on OK 3.) Now if you will try to change it back to JDK7, even if you click on JDK7, it will not be selected. The only solution to get it back is to remove the nb-configuration.xml file. JDK7u3, NetBeans Dev Build 201203280401
Confirmed; probably regression from recent customizer refactoring.
https://hg.netbeans.org/core-main/rev/f550eb4eb712
Integrated into 'main-golden', will be available in build *201204040400* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/f550eb4eb712 User: Milos Kleint <mkleint@netbeans.org> Log: #210525 null used to have 2 meanings, default value and not found value. replacing the defautl value meaning with a constant