Unnecessary duplication of small utility method.

1
src/java.management/share/classes/com/sun/jmx/mbeanserver/Util.java: public static ObjectName newObjectName(String string)

This method uses new ObjectName(string).

2
src/java.management/share/classes/sun/management/Util.java public static ObjectName newObjectName(String name)

This one uses ObjectName.getInstance(name), which is defined in ObjectName.java to do: return new ObjectName(name).
So these two are equivalent.