Jetty 9 Server has no start() method

Question

I am trying to embed a Jetty server in an application and am seeing a really strange problem:

According to documentation, a simple server (which I am building as a test) can be started up using the following code:

import org.eclipse.jetty.server.Server;

public class SimpleServer throws Exception
{

   public static void main(String[] args)
   {
      Server server = new Server(8080);

      server.start();
      server.join();
   }

}

I believe I have the correct Jar file from the downloaded Jetty:

jetty-server-9.3.7.v20160115.jar

Unfortunately, I am seeing that the Server class I am using has no public start() method. It has a protected start() method that has a LifeCycle parameter, but that is it. The public start() method referenced in the documentation (and in several answers here in Stack Overflow) does not exist!

Am I using the right Server class? If not, where do I get a proper one???

Someone please advise...

Depositor

Answer 1

You need also add "jetty-util-{version}" into your project and this will fix your issue. Or you can use maven in your project and add "jetty-server-{version}" as maven dependency. Maven will automatically download all jetty-server relative jars (including jetty-util-{version}).

Politicize

I don't understand how this will help. I have both jars in my dependencies and the method is still protected. I can't find any examples that acknowledge the issue at all. – Effluent

Once you add this dependency - it is going to use AbstractLifeCycle.start method. If you added "jetty-util-{version}" - refresh your project and now public Server.start method without params should be available. – Politicize

Worked for me. Thanks. I've been away from Java for a while and, as far as I recall, there was no such thing as extension method (like C# has). This answer would be awesome if the mechanics behind it was explained. – Brehm

found my own answer: AbstractLifeCycle is far away in the inheritance chain. – Brehm

Answer 2

There's no problem here.

A public modifier Server.start() exists, and has existed since (at least) Jetty 5.0 days.

Not sure what library / build you are using, but this method is not protected, in the Server class, the AbstractLifeCycle (abstract) class or even the LifeCycle interface.

Madera

In Jetty 9.2.14 it is definitely protected. Here is some slightly older javadoc that also shows it as protected download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/… – Effluent

@Effluent start(LifeCycle) (protected/internal) is not the same as start() (public/api). – Madera

Answer 3

public abstract interface org.eclipse.jetty.util.component.LifeCycle

is in jetty-util-{version}.jar, add this jar to your project build path

Secret

Answer 4

Server.start() is protected. If you write a MyJetty class which does nothing but extend he jetty Server, and it is an inner class, you can call the start() method on it.

Here's what I did in the class that wanted to start Jetty()

/**
 * Extend the jetty server just so you can call the protected method start()
 */
static class MyJettyServer extends Server {

    public MyJettyServer(int port) {
        super(port);
    }
}

This seems like very much the wrong answer, but it worked.

Effluent