Locking: lock name with negative hashCode() throws out of bound exception ------------------------------------------------------------------------- Key: JGRP-1639 URL: https://issues.jboss.org/browse/JGRP-1639 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.3.1, 3.4 [Steve Luebbe] Based on the code in the org.jgroups.protocols.Locking it tries to calculate an index based on the lock name (code in next 2 lines): {code} protected Lock _getLock(String lock_name) { int index=lock_name != null? lock_name.hashCode() % locks.length : 0; return locks[index]; } {code} When debugging I can see that: lock_name = dpa_project lock_name.hashCode() = -1316662737 locks.length = 10 SOLUTION: use Math.abs() on the hash code