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I'm trying to index a file structure (not actual data) relative to a specific path on my local disk. Initially I load the file structure to memory then listen for real changes in the directory. If one occurs then I update the relevant indexed files in internal memory. Not unlike what dropbox seems to do?

Does there exist any java-library which can do this? I don't really want to implement this from scratch.

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To listen for changes on a file, you can have a look at apache commons io which has a FileAlterationMonitor.

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I was looking for the method to store the meta-data and manage it. Not how to monitor it. I was using JNotify for that (though FileAlterationMonitor seems good as well).
@Zoiros My bad, I thought the point was about monitoring file changes. You can have a look at JBoss VFS or Apache Commons VFS
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Java 7, as part of NIO.2, has the WatchService API.

The WatchService API is designed for applications that need to be notified about file change events.

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I am running on a mac. I'm having truble getting Java 7, let alone NIO.2, to work. Any suggestions?
@Zorios - get a different computer for doing your Java development and running Java applications. Or use a different language for developing Mac applications.

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