Recent changes in java.util.TimeZone created new setter and getter
methods for setting and obtaining the defaultTimeZone for VM.
Synchronization on these methods has caused some performance issues for
VMs making heavy usage of TimeZone.getDefault()
Fix is to remove synchronization and make the mainAppContextDefault
variable volatile.
webrev : http://cr.openjdk.java.net/~coffeys/webrev.7196533.jdk8/
<http://cr.openjdk.java.net/%7Ecoffeys/webrev.7196533.jdk8/>
bug report : http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7196533
regards,
Sean.
