How to run Jetty with SPDY using ALPN?

StackOverflow https://stackoverflow.com//questions/25035063

  •  21-12-2019
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Question

I have returned to JDK8 with Jetty and SPDY and I see that now Jetty 9.2 supports ALPN protocol instead of NPN (see my question How to run Jetty with SPDY on JDK8?). So I set bootclasspath:

java -Xbootclasspath/p:c:/jars/alpn-boot/alpn-boot-8.0.0.v2014031 ...

But now I got exception:

Exception in thread "xyz.server" java.lang.NoClassDefFoundError:
        org/eclipse/jetty/npn/NextProtoNego$ServerProvider
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    ...
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.jetty.spdy.server.http.HTTPSPDYServerConnector.<init>(HTTPSPDYServerConnector.java:63)
    at org.eclipse.jetty.spdy.server.http.HTTPSPDYServerConnector.<init>(HTTPSPDYServerConnector.java:53)
    at org.eclipse.jetty.spdy.server.http.HTTPSPDYServerConnector.<init>(HTTPSPDYServerConnector.java:43)
    at xyz.my.my_httpsrv_jetty.startHTTPSServer(my_httpsrv_jetty.java:359)
    ...

I use java version "1.8.0_05" and jetty 9.2.2.v20140723.

The same error I got with JDK 1.7 and alpn-boot-7.0.0.v20140317.jar on WinXP where I changed if from -Xbootclasspath/p:c:/jars/npn-boot/npn-boot-1.1.7.v20140316.jar

This execption points in my code into:

SSLconnector = new HTTPSPDYServerConnector(server, sslContextFactory);

It seems that even with ALPN jetty needs classes from npn-boot. Is it a bug or I have done something wrong?

Was it helpful?

Solution

HTTPSPDYServerConnector was not updated to ALPN and currently hardcodes usage of NPN.

In order to use ALPN with SPDY you have to configure a ServerConnector instead in this way:

SslContextFactory sslContextFactory = new SslContextFactory();
HttpConfiguration httpConfig = new HttpConfiguration();

SslConnectionFactory ssl = new SslConnectionFactory(sslContextFactory, "alpn");
ALPNServerConnectionFactory alpn = new ALPNServerConnectionFactory("spdy/3", "http/1.1");
alpn.setDefaultProtocol("http/1.1");
HTTPSPDYServerConnectionFactory spdy = new HTTPSPDYServerConnectionFactory(SPDY.V3, httpConfig);
HttpConnectionFactory http = new HttpConnectionFactory(httpConfig);

Server server = new Server();
ServerConnector connector = new ServerConnector(server, new ConnectionFactory[]{ssl, alpn, spdy, http});

server.start();

I tracked this as https://bugs.eclipse.org/bugs/show_bug.cgi?id=440756.

Finally, if you don't use the code directly, but use Jetty as a server and deploy webapps to it, Jetty already configures properly either ALPN or NPN depending on the modules that are activated.

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