6734813: Provide a way to construct an ObjectName without checked exceptions 6746649: ObjectName constructors and methods declare unchecked exceptions in throws clauses Reviewed-by: dfuchs

6733145: (bf) CharBuffer.subSequence can be updated to take advantage of covariant returns Summary: Change return type to CharBuffer Reviewed-by: alanb

6728229: (str) StringBuilder.append(CharSequence) does not throw IndexOutOfBoundsException Summary: Major spec rework Reviewed-by: alanb

6745832: jmx namespaces: Some refactoring/commenting would improve code readability. Reviewed-by: emcmanus