The file lock implementation on some JVM/OS combinations is broken. See: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4883030 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4854085 If -Djava.nio.channels.FileLock.broken=true is now passed as an argument to the JVM, the actveio journal will avoid using that file locking APIs.
incubator/activemq/trunk/activeio/activeio-core/src/main/java/org/apache/activeio/journal/active/ControlFile.java