How can a desktop application communicate with a web application?

There's probably more alternatives that I will propose, but quick solutions that I see are as follows.

There's probably more alternatives that I will propose, but quick solutions that I see are as follows: Expose web services/REST/anything that fits well so that your desktop app could exchange information in client-server manner Use your GWT RPC services from desktop app. I think that should be possible, and quick search revealed this one: Java on Gems.

You can expose the functionality of your server application through web-services. SOAP or REST are standard. Then you can invoke these services from the desktop client.

With Java, these are covered by JAX-WS and JAX-RS. Which have multiple implementations. Metro, Jersey, CXF, RESTEasy.

Technically, you can write browser extensions that can communicate with your desktop app, and in turn modify / interact with the pages, but that would be harder to create and maintain.

Direct communication from web application to desktop application is not possible.. you should use a mediator.. And also, you have to use long polling for gwt application to get commands from desktop application.

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