java.net.http.WebSocket.newBuilder(URI uri, Listener listener) doesn't state NullPointerException

The API behave correctly, but in its javadoc it states "
Throws:
  IllegalArgumentException - if the uri is not a WebSocket
  URISecurityException - if running under a security manager and the caller does not have permission to access the default HttpClient"

I think it is necessary to state if NPE will be thrown if null is specified