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1. Create a new J2SE project, do not ask the wizard to create a main class 2. Run this project 3. The following error will be printed in the output window: C:\...\Pr1\build.xml:25: Following error occured while executing this line C:\...\Pr1\nbproject\build-impl.xml:82: Classname must not be null. BUILD FAILED (total time: 1 second) This message is hard to parse. There should be a better message that will alert the user about missing main class.
*** Issue 44017 has been marked as a duplicate of this issue. ***
Long since fixed.