Others have suggested websockets, but there are several other options as 
well.  There is google cloud messaging and many other libraries to solve 
this problem as well as ServerSent Events.

http://www.html5rocks.com/en/tutorials/eventsource/basics/

If none of those are options, try to avoid using a regular timer.  More 
timers, more problems.  If you must use a timer like object, I would 
suggest using gwt Scheduler instead.

On Tuesday, September 20, 2016 at 2:38:11 AM UTC-7, Olar Andrei wrote:
>
> Hello,
>
> In my GWT application I have a messaging system integrated within. When a 
> specific conversation gets opened, a query runs and selects all messages 
> available for this conversation. From the same view you can reply to that 
> conversation. When replying, the other user has to click a small refresh 
> button (located on top, which agian gets all mesages from the DB running 
> the same query from above) in order for the last message to appear.
>
> My question: How can I make that refresh automatically, so you don't have 
> to click on the button in order to refresh the conversation. Like in FB, 
> Messenger, etc, where you don't refresh the conversation and the messages 
> keep coming without you having to do anything.
>
> Thanks in advance.
>

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