Tag Archives: javaee7

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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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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Using CDI with Java EE Concurrency Utilities

Posted on April 20, 2017 by Abhishek

This blog post explores usage of CDI along with Java EE Concurrency Utilities – specifically using CDI beans as managed tasks. Here is the sample application on Github Lets begin with a quick overview Java EE Concurrency Utilities provides APIs … 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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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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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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Dynamic provider registration in JAX-RS

Posted on November 24, 2016 by Abhishek

The DynamicFeature class in JAX-RS (2.0) allows you to register providers Dynamically i.e. without any pre-defined binding strategy (e.g. annotations) Based on criteria i.e. to help decide which provider to bind to which JAX-RS resource(s) The JAX-RS implementation detects and executes … Continue reading →

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WebSocket and CDI integration.. again..

Posted on November 18, 2016 by Abhishek

In one of my older blog posts, I had written about what does not work as far as WebSocket and CDI integration within the Java EE Platform 😉 This one talks about what’s possible with CDI in terms of Dependency Injection Interceptors … Continue reading →

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Configuring WebSocket server endpoints

Posted on November 3, 2016 by Abhishek

WebSocket Server endpoint configuration Before we dive into the details, here is a quick snapshot of the related interfaces Class/Interface Description ServerEndpointConfig A derivative of EndpointConfig interface which is specific for configuration related to server side WebSocket endpoints ServerEndpointConfig.Configurator An … Continue reading →

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