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I can only enter commandline parameters (arguments and VM options) for running the project (meaning the main class) in the project properties UI. It is also needed to have commandline parameters for start/debug/test a single class. NetBeans 3.x was able to do that. OK, you can always override Ant targets to achieve this, but then you must have Ant knowlegde, which should not be necessary for such simple things. To be clear: Both arguments and VM options are needed.
*** Issue 170356 has been marked as a duplicate of this issue. ***