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    <p>This is normal / expected. Depending on your browser and (especially) front-end server (Apache/NGINX) and web-server (Tomcat?) configuration you will have:</p> <ul> <li>maximum wait time for the first response (connection timeout, probably 10 seconds in your case)</li> <li>maximum wait time for the complete response</li> </ul> <p>These setting basically prevent the server from being spammed with requests that never complete and running out of threads in the thread pool.</p> <p>You could increase these values, however you should always create your code like this with timeouts in mind. Basically you want to do on the client side:</p> <ul> <li>Open long pull</li> <li>Wait for response</li> <li>If received, continue</li> <li>If (timeout) error, go to step 1</li> </ul> <p>Please note that this solution is not scalable: usually you would have (for example) 200 thread processing incoming requests. The idea is that they finish fast. If the thread pool is exhausted, users will have to wait for a new connection. But with 200 threads you are able to serve well over 2.000 users. But not if threads are blocked because of long pool.</p> <p>If possible, you should really look into <a href="https://blogs.oracle.com/arungupta/entry/websockets_and_java_ee_7" rel="nofollow">WebSockets</a>, which are now available in new versions of Java. </p> <p><em><strong>EDIT</em></strong> As Konrad suggested below, you can use something like <a href="http://socket.io/" rel="nofollow">socket.io</a>, which falls-back automatically to other mechanisms. There's a Java-based implementation for sever-side available call <a href="https://github.com/Atmosphere/atmosphere" rel="nofollow">Atmosphere</a>, but I haven't tried it though.</p>
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    1. POLong polling in JQuery + JAVA?
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    1. COCheck out http://socket.io, it is a nice JavaScript library for creating socket connections. It also offers backwards compatibility for older browsers.
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    2. COsocket.io is sweet, but server-side is limited to NodeJS (naturally). If you want to use it on a Java-based backend, you need JEE7-compatible application server. Quick Google search turned up this: https://github.com/Atmosphere/atmosphere for Java-backends and socket.io on frontend.
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    3. COcometd is an excellent alternative http://cometd.org
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