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When you open a generated class file, you see a message at the top: Showing generated source file. No sources are attached to class' JAR file. Would be better to show the actual code source: Showing generated source file. No sources are attached to: /home/jglick/.m2/repository/grp/art/1.0/art-1.0.jar since otherwise it is not necessarily clear which version of the library you are looking at, or in some cases which library period. The tab tooltip is useless as it just points into some gensrc dir in the NB cache (unclear if this could be overridden).