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I have installed NB 6.5 and added JRuby 1.2.0RC1 as a ruby platform (also added ruby-debug-ide according to wiki.netbeans.org). I then selected an existing project which works fine with mr 1.8.6 and 1.8.7 and jr 1.1.4 and changed it to use the new jr 1.2.0 When I attempt to launch the program for debugging, approximately 2 seconds or less after it is launched, I receive the attached error dialog indicating the debugger couldn't connect within 15 seconds. As you can see by the error, the system is generating a NumberFormatException attempting to use the 0RC1 portion of the JRuby version. From what I am able to discern based on how the JRuby platform was added, this is coming from the JRuby Platform name or a call to the jruby runtime itself and not the file folder for JRuby. Unfortunately, in this instance, the 0RC1 is a valid part of the installation name and should be accepted.
Created attachment 77684 [details] Error dialog
Created attachment 77685 [details] log file
Seems to be a duplicate of issue 159206, this is an issue in v3 prelude. It is fixed in later v3 builds, and 1.2.0 final should work fine with prelude too. *** This issue has been marked as a duplicate of 159206 ***