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Edit a java source. Place the cursor on the name of the class being edited. RMB | Tools | Explore Node | Its Parent should bring up a window with an explorer tree with a root of the file that contains the given class. This current brings up a window that says <No Parent>
Actually, the behaviour is correct: there's not a single node hierarchy - so the "class" portion of the source is represented by one node in the Explorer, another node in the Quick browse and yet another node created just for the IDE's context switching (which you've browsed). That node has no parent at all :-)
While that sounds like the technically correct answer, it seems extremely non- intuitive to me. It seems to me that the source definition of a class does have exactly one parent, namely the file that contains that definition. I must admit I don't know what you are referring to when you mention Quick Browse or the Context Switching node. Perhaps that's why this is confusing. Has this issue been discussed on nbusers before?
:-) Quick Browse is the tiny toolbar at the top of java editor window (see Java Sources options in Editing for property that enables it). It seems that you've installed the APISupport module - that one provides the Tools -> Explore Node submenu. Since "normal" users are not expected to use APISupport, I inferred that you're into NB development and provided low-level explanation. And while it may be non-intuitive, I believe that it is wrong to require exactly one visual parent-child relationship (= conform to one hierarchy in all views) on data pieces - it limits flexibility of the system.
Resolved for 3.4.x or earlier, no new info since then -> closing.