Tag Archives: websocket

CDI (2.0) Async Events

Posted on June 11, 2017 by Abhishek

Glassfish 5 builds for Java EE 8 are rolling along… here is another Docker based example on Github. This time it’s asynchronous events in CDI 2.0 (JSR 365) Steps Just follow the README… just a bunch of docker commands to get … Continue reading →

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Accessing HTTP Session in WebSocket endpoint

Posted on June 3, 2017 by Abhishek

It’s possible to obtain a reference to the HttpSession within a WebSocket application using a custom implementation of ServerEndpointConfig.Configurator Here is an example application on Github Steps… Override the modifyHandshakeRequest method call the getHttpSession method on the HandshakeRequest object which is passed into the … Continue reading →

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kafEEne #1: Websocket & Kafka

Posted on May 22, 2017 by Abhishek

Say hello  to kafEEne ! A blog series which will show Kafka and Java EE examples This one is about Kafka + (Java EE) Websocket API. Code is on Github and you can refer to the README on how to get this … Continue reading →

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Handling ‘state’ in Java WebSocket applications

Posted on April 27, 2017 by Abhishek

By and large, there are two kinds of states in a WebSocket application User/client specific: related to a connected user/Session e.g. user ID, list of subscriptions, last message received etc. Global: state which is relevant across your application and something … Continue reading →

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Trending Meetup groups with Redis and Java EE

Posted on March 20, 2017 by Abhishek

This is an application which displays the currently trending Meetup groups based on their (live) RSVPs feed. It’s built using Java EE 7 (uses WebSocket client & server APIs, Singleton EJB timers and CDI events to wire things up) and … Continue reading →

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Github: WebSocket applications…

Posted on March 2, 2017 by Abhishek

I recently pushed a couple of WebSocket samples to Github. Both are based around the notion of a chat service – a canonical WebSocket example! These were originally meant to serve as additional material to the Java WebSocket API Handbook in order … Continue reading →

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Quick tip: managing Stateful EJBs in WebSocket endpoints

Posted on February 28, 2017 by Abhishek

@Stateful EJBs can be injected in WebSocket endpoints (supported by the WebSocket specification). There is an one-to-one association between the WebSocket client & endpoint (which is by default) as well as the injected Stateful EJB instance, which makes it an good candidate for storing … Continue reading →

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WebSocket endpoint as Singleton EJB

Posted on February 14, 2017 by Abhishek

By default … … a WebSocket implementation creates a new (server) endpoint instance per client. In case you need a single instance, you can implement this using a custom ServerEndpointConfig.Configurator (by overriding the getEndpointInstance method) The catch: you might have to sacrifice some … Continue reading →

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New release: Java WebSocket API handbook

Posted on January 24, 2017 by Abhishek

Happy to announce the initial release of the Java WebSocket API handbook. This is still a work in progress but moving at a strady pace. You can read this on Gitbook or grab your PDF/ePub/Mobi version from Leanpub   Here is … Continue reading →

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Using Asynchronous timeouts in the Java WebSocket API

Posted on December 6, 2016 by Abhishek

Sending messages in an asynchronous manner avoid blocking the sending thread. This is a great where your solution needs to scale in order to support a large number of clients. But there is a limit on how long can we … Continue reading →

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