Embedded Java server using Grizzly: how to enable HTTP2

Question

So, I'm trying to create a REST API server using Grizzly / Jersey, and it works fine, but I cannot figure out how to enable http2. Documentation on this subject is almost non-existent. This is what I have:

private static SSLContext getSSLContext(final String keystore) throws Exception {
    SSLContext sslContext = SSLContext.getInstance("TLSv1");
    final char[] passphrase = "changeit".toCharArray();
    final KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
    final KeyStore ks = KeyStore.getInstance("JKS");
    try (InputStream stream = Main.class.getResourceAsStream(keystore)) {
        ks.load(stream, passphrase);
    }
    kmf.init(ks, passphrase);
    sslContext.init(kmf.getKeyManagers(), null, null);
    return sslContext;
}

final ResourceConfig rc = new ResourceConfig().packages("path.to.package");
final HttpServer server = GrizzlyHttpServerFactory.createHttpServer(uri, rc, false);
final NetworkListener listener = server.getListeners().iterator().next();
listener.registerAddOn(new Http2AddOn());
listener.setSecure(true);
final SSLEngineConfigurator configurator =
    new SSLEngineConfigurator(
        getSSLContext("keystore.jks"),
        false,
        false,
        false
    );
listener.setSSLEngineConfig(configurator);

And as far as I know, I have all the relevant dependencies in my pom.xml file:

<dependency>
    <groupId>org.glassfish.grizzly</groupId>
    <artifactId>grizzly-http2</artifactId>
    <version>2.3.24</version>
</dependency>

<dependency>
    <groupId>org.glassfish.grizzly</groupId>
    <artifactId>grizzly-npn-bootstrap</artifactId>
    <version>1.2</version>
</dependency>

<dependency>
    <groupId>org.glassfish.grizzly</groupId>
    <artifactId>grizzly-npn-api</artifactId>
    <version>1.2</version>
</dependency>

<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-grizzly2-http</artifactId>
</dependency>

When I test the server with curl -v -http2 ... I get

• ...
• ALPN / NPN, the server does not agree with the protocol
• SSL connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
• ...

Does anyone know what is missing?

Answer 1

, . : http://unrestful.io/2015/10/09/alpn-java.html

Java 8 ALPN. grizzly-npm-bootstrap . Xbootclasspath :

java -Xbootclasspath/p:/path/to/grizzly-npn-bootstrap.jar

, JRE. Java 8, grizzly-npn-bootstrap.jar OpenJDK 7, .

- Jetty, alpn-boot (?) OpenJDK.