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Dev build. Create a Maven project with a dep on org.apache.lucene:lucene-core:3.0.3 and download binaries and sources. Go to Type on org.apache.lucene.store.NativeFSLockFactory works. But GtT on org.apache.lucene.store.NativeFSLock does not; shows a generated source file. The reason is that NativeFSLock is inside NativeFSLockFactory.java, but javap at least knows this: Compiled from "NativeFSLockFactory.java" class org.apache.lucene.store.NativeFSLock extends org.apache.lucene.store.Lock{ ... } Presumably the IDE has access to the same bytecode information and ought to know where to look for the source file.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss