Just ran multiple times into LUCENE-4740 that is fixed in Lucene 4.4. Would it be possible to upgrade JackRabbit to this (or newer) version of Lucene?
Weak references cause extreme GC churn
old dependency for lucene-core
Upgrade Lucene to 3.6.2
Upgrade to latest lucene-core
Improve index performance by upgrading lucene to 4.x
Update Apache Lucene