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The book is what it says it is - a handbook, a quick reference, a fast track guide. It covers the nitty gritty of the Java WebSocket API which is a standard (specification) for building WebSocket applications. It is targeted (primarily) towards Java/Java EE developers and can be used in various capacities

As a getting started with the Java WebSocket API guide
You are already well versed with this API and its constructs, but need a quick peek/reference to a specific API, it's usage, nuances etc.
Maybe you're just curious about what Java has to offer in terms of WebSocket support - feel free to check this out

The first three lessons are meant to get your feet wet

Warm up
API Overview
Programming Model

Then comes the core part which is important from a API usage perspective

Sending Messages
Receiving Messages
WebSocket Client API

The default conventions offered by the WebSocket API can actually hide the details related to Configuration & Deployment, but you should know them anyway !

Configuration
Deployment

The book ends with a exploration of how the API integrates with other Java EE specifications as well as a quick peek into the threading details of some of the API constructs

Tying in with the Java EE Platform: Part I (EJB, CDI) and II (Servlet, Security)
Lifecycle and Concurrency semantics

It is not meant to be ...

a generic discourse on WebSocket: it deals with the Java implementation of the WebSocket specification (JSR-356 to be specific)
a deep dive into the WebSocket RFC
exploration of other Java based WebSocket APIs/frameworks (e.g. Atmosphere etc.) is not the goal of this book

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