Hi Subhi Quroush,
Unfortunately, at the moment, we do not have examples of integration of Lightstreamer with Vaadin.
But, since the client-side framework of Vaadin is based on the Google Web Toolkit (GWT) you could refer to this example "
Lightstreamer - Basic Stock-List Demo - HTML (GWT) Client". This example leverages our JavaScript client library inside the GWT Java code.
HTH,
Giuseppe