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When you include aopalliance.jar in your compile classpath you cannot resolve any of it's classes. For example: public class MyInterceptor implements MethodInterceptor { } MethodInterceptor is inside aopalliance.jar and there no way you can get nb to resolve that class. btw, aopalliance.jar only contains interfaces, don't know if that's got something to do with this problem. The jar is open-source, you can download a copy here: http://prdownloads.sourceforge.net/aopalliance/ aopalliance.zip?download
I'm sorry I cannot reproduce it in latest build. I downloaded aopalliance.jar, added it to compile classpath via project customizer and code completion started to offer interfaces from aopalliance.jar.