If true, the ME2 classloader will take extra measures to avoid JAR file locking when resources are accessed inside JARs through "file://" URLs. This will impact startup time of applications, but could prove to be useful on platforms or configurations where file locking can occur. If not specified, the default value is false.
Useful during development.
This is the problem with JDK
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4851466
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4405789