uml - How can I create a component into node for diagram deployment -

I started with models for the design of computer systems on my problem deployment diagram, I am creating my node diagram . But I'm blocked here

For example, I have a node "Server Application" I would like to say that Tomcat is a component for this node. But I can not. What do I know that I mention here as an information object can be used here in the node server application. You all

Hope this helps ...

RB