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What would be the best way to create a JS chat client with GWT? The bit that I’m having trouble with is the persistence and transfer of the messages. Should I store the messages in a DB and check the db for new messages? Is there a much better way to do this?
Like jah suggested, you definitely want to use Comet/Server Push/Reverse AJAX/many other names. I’ve compiled your options for GWT in another post.
If you want a quick start, look at the NGiNX_HTTP_Push_Module – they have an easy to understand chat example. You’ll have to write some handling of the protocol yourself, but it’s a rather simple task.
If you’re using Java too on the backend, the easier solution will be rocket-gwt or cometd.