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Lucene <= 1.2 creates .lock files in the index directory itself. With >= 1.3 it creates it in java.io.tmpdir (usually /tmp on *NIX systems).
If you get the Exception:
java.io.IOException: Lock obtain timed out
- at org.apache.lucene.store.Lock.obtain(Lock.java:97) at org.apache.lucene.store.Lock$With.run(Lock.java:147)
This is because Lucene was unable to open the index becuase it's currently locked.
Note that on Tomcat locks are kept in TOMCAT_HOME/temp and this can become confusing because if you check /tmp there are no lock files.
You can also pass lucene a system property to increase the commit/write lock timeout interval, like so:
The above sets the timeout to one minute.