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Explaining Apache ZooKeeper
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How to use an existing database with an Android application [duplicate]
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doGet and doPost in Servlets
... variables — which is NOT threadsafe). So I would strongly recommend to learn a bit more about basic Java SE API using the Oracle tutorials (check the chapter "Trails Covering the Basics") and how to use JSP/Servlets the right way using those tutorials.
See also:
Our servlets wiki page
Java EE ...
Differences between action and actionListener
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How does “this” keyword work within a function?
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Curious null-coalescing operator custom implicit conversion behaviour
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In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
... going away.
WebRTC allows for peer-to-peer communication.
I recommend learning WebSockets.
Comparison:
of different communication techniques on the web
AJAX - request → response. Creates a connection to the server, sends request headers with optional data, gets a response from the server, ...
SAML: Why is the certificate within the Signature?
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When to wrap quotes around a shell variable?
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Do HTML WebSockets maintain an open connection for each client? Does this scale?
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