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filtered method creates local variable-based synchronized collection (Findbugs)

This method creates a synchronized collection and store the reference to it in a local variable. As local variables are by definition threadsafe, it seems questionable that this collection needs to be synchronized.

If you are using	consider using
java.util.Vector	java.util.ArrayList
java.util.Hashtable	java.util.HashMap
java.lang.StringBuffer	java.lang.StringBuilder