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When I on the ant.xml file open context menu and choose: Debug Target -> Advanced - raise exception java.lang.NoClassDefFoundError: org/ apache/tools/ant/module/AntSettings And is supported breakpoints in ANT script? I tedted it ant ANT while debugging doesn't stop on breakpoints. Tested in NB 5.0 beta
Indeed, AntSettings is not exported from the ant module, so ant/debugger cannot access it. By the way reporter next time please attach your messages.log file. Otherwise it can be hard to impossible to see what the actual error is.
Created attachment 25348 [details] NB log
I'm sorry. I think that this problem doesn't need log.
Fixed by adding required module dependency as a part of fix of issue #65658.
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.