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When Autodetect is invoked, findPlatformProperties fails to determine the properties of a Jython platform (additional to the included "Packaged" Jython). Note that Python platforms are not affected by this anomaly. Internally, PythonPlatformManager's findPlatformProperties fails (pye.run results in '3' instead of '0') when executing Jython platform_info.py. This becomes a minor bug once the Packaged Jython is upgraded to 2.7, but should still be fixed because someone might (?) want to have multiple versions of Jython. Found near line 380 in PythonPlatformManager.java
I have fixed this as part of the overall rework of Autodetect. It will appear after code review.
Fixed as part of http://hg.netbeans.org/main/contrib/rev/7e8e41f35dc9 Should appear in Development build on 18/May/2015