While working on some recent Logger issues, Mandy pointed out some possible synchronization issues in the Logger, LogManager area. We may address these at a later date.

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Logger.java - Logger.setFilter and Logger.getFilter
are not synchronized but only the levelValue variable is volatile. I believe
JDK6 version is wrong and I expect the following variables are made volatile
in order to remove synchronization on the setFilter/getFilter and maybe
some other methods [1].
     private volatile boolean useParentHandlers = true;
     private volatile Filter filter;
     private volatile Logger parent; // our nearest parent.
     private volatile Level levelObject;
     private volatile int levelValue; // current effective level value

[1]http://hg.openjdk.java.net/jdk8/jdk8/jdk/rev/6eac3829cb41
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