code: protected void activate()
     {
        LOG.debug("Activating receipt of incoming messages");
        String addr = endpointInfo.getAddress();
        try
        {
           new URL(addr);
        }
        catch (Exception e)
        {
           throw new Fault(e);
        }
        engine.addHandler(addr, new Handler(this, SecurityActions.getContextClassLoader()));
     }
docs: Activate receipt of incoming messages.