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Product Version = NetBeans IDE Dev (Build 201109202329) Operating System = Windows 7 version 6.1 running on x86 Java; VM; Vendor = 1.7.0 Runtime = Java HotSpot(TM) Client VM 21.0-b17 I opened an old project with that dependency (works fine on 7.0.1) and says the library is missing.
Unfortunately, this is as it should be. NetBeans support of Swing Application Framework library has been discontinued. It means that it is not possible to edit .form files using the library in NetBeans 7.1+. If you need this support then you have to stay with NetBeans 7.0.1. On the other hand, you still should be able to compile the project in NetBeans 7.1 once you invoke Resolve Reference Problems on the mentioned project. This dialog should help you to download the Swing Application Framework library (but not the editing support for NetBeans). I am marking this issue as invalid because the described behavior is as designed.