Is there a sophisticated file system monitor for Java which is freeware or open source? [closed]

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JNotify seems to do what you require.

Polling a filesystem (say, a directory for update time changes) won’t impose a significant load on your system, and shouldn’t be discounted. Apps like Tomcat etc. use this for managing hot deploys with few problems.

It’s not a lot of help now, but the upcoming Java 7 has a WatchService precisely for this.

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