Getting ready

Let's start by adding the right dependency to our project:

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-grizzly2-http</artifactId>
        <version>2.28</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.inject</groupId>
        <artifactId>jersey-hk2</artifactId>
        <version>2.28</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-sse</artifactId>
        <version>2.28</version>
    </dependency>
</dependencies>

You surely noticed that we are using Jersey here. Why? Because Jersey is one of the reference implementations for JAX-RS, which means that it implements all JAX-RS specifications.

Moreover, with Jersey, we can use Grizzly to start a small local server, which will be useful for this recipe, as we need just a few server features to show the SSE behavior.

Further on in this book, we will use a full GlassFish to build more JAX-RS recipes.