Returns new instance of DNS URL context.
Parameters: obj - either null, URL in string form or array ofURL in string form Parameters: name - ignored Parameters: nameCtx - ignored Parameters: environment - is passed to the context being created created DNS context, an instance of eitherdnsURLContext or DNSContext class throws: IllegalArgumentException - if bad obj is given throws: NamingException - if such exception was encountered See Also:ObjectFactory.getObjectInstance(ObjectNameContextHashtable)