def [](name)
      attribute = @server.getAttribute(@object_name, name.to_s)
      return attribute.value if attribute.kind_of? javax.management.Attribute
      attribute
    end
def [](name)
      attribute = @server.getAttribute(@object_name, name.to_s)
      return attribute.value if attribute.kind_of? javax.management.Attribute
      attribute
    end
Get MBean attribute specified by name.  If it is just a plain attribute
 then unwrap the attribute and just return the value.