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Push notifications

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  Push notifications Alberto Salvati <zzzato@gmail.com> - 2016-09-16 01:40 -0700

#35620 — Push notifications

Hi, all.
My webapp needs to send notification to clients (ie, android tablets) when server side data changes.
I found material about Websockets like this:

http://stackoverflow.com/questions/26409937/how-to-implement-push-to-client-using-java-ee-7-websockets

https://samsaffron.com/archive/2015/12/29/websockets-caution-required

http://stackoverflow.com/questions/31476344/how-to-establish-a-websocket-connection-in-android-service

Also, I found this:

http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/async-servlet/async-servlets.html

I've doubts.
About android, I found ONLY ONE LINK (see above) about WebSockets.
Aboug jee7, I found few examples.
..maybe is websockets not stable or...?

Is asynch servlet a "good pattern"? 

Thanks in advance.

A.

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