Is there a way to take screenshots of current running Java desktop application and stream it as video?

So I have a java desktop application running on a server.

I would like to take series of screenshot which can be streamed to the client.

It should be almost as if watching a VNC video output.

Basically need a way to stream the graphic output from java d开发者_如何学运维esktop application runing on the server to the client.

It would best if there was a tool to capture the region of the running application and stream that region as video to the client.

Using Cisco Webex you can make that server a host of the presentation and then only share the window you need with other 'participants' of the presentation. Buy Webex costs money. I am sure that there is some VNC tool that can share only part of the desktop. Maybe UltraVNC?