Spring 3.1 WebApplicationInitializer & Embedded Jetty 8 AnnotationConfiguration

Question

I\'m trying to create a simple webapp without any XML configuration using Spring 3.1 and an embedded Jetty 8 server.

However, I\'m struggling to get Jetty to recogni

Answer 1

Solution that worked for me and does not involve scanning, but uses WebApplicationInitializer class that you provide. Jetty version: 9.2.20

public class Main {

public static void main(String... args) throws Exception {
    Properties properties = new Properties();
    InputStream stream = Main.class.getResourceAsStream("/WEB-INF/application.properties");
    properties.load(stream);
    stream.close();
    PropertyConfigurator.configure(properties);

    WebAppContext webAppContext = new WebAppContext();
    webAppContext.setResourceBase("resource");
    webAppContext.setContextPath(properties.getProperty("base.url"));
    webAppContext.setConfigurations(new Configuration[] {
        new WebXmlConfiguration(),
        new AnnotationConfiguration() {
            @Override
            public void preConfigure(WebAppContext context) {
                ClassInheritanceMap map = new ClassInheritanceMap();
                map.put(WebApplicationInitializer.class.getName(), new ConcurrentHashSet<String>() {{
                    add(WebInitializer.class.getName());
                    add(SecurityWebInitializer.class.getName());
                }});
                context.setAttribute(CLASS_INHERITANCE_MAP, map);
                _classInheritanceHandler = new ClassInheritanceHandler(map);
            }
        }
    });

    Server server = new Server(Integer.parseInt(properties.getProperty("base.port")));
    server.setHandler(webAppContext);
    server.start();
    server.join();
}
}

The source (in russian) of this code snippet is here: https://habrahabr.ru/post/255773/

Answer 2

What about just setting the context attribute that tells the scanner which things belong on the container classpath that need to be scanned?

context attribute: org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern ./servlet-api-[^/].jar$

It is designed to be used with jar names, but you could just match everything.

You'd need to use the WebInfConfiguration as well as the AnnotationConfiguration classes.

cheers Jan

Answer 3

I was able to resolve in an easier but more limited way by just providing explicitly to the AnnotationConfiguration the implementation class (MyWebApplicationInitializerImpl in this example) that I want to be loaded like this:

webAppContext.setConfigurations(new Configuration[] {
    new WebXmlConfiguration(),
    new AnnotationConfiguration() {
        @Override
        public void preConfigure(WebAppContext context) throws Exception {
            MultiMap<String> map = new MultiMap<String>();
            map.add(WebApplicationInitializer.class.getName(), MyWebApplicationInitializerImpl.class.getName());
            context.setAttribute(CLASS_INHERITANCE_MAP, map);
            _classInheritanceHandler = new ClassInheritanceHandler(map);
        }
    }
});

Answer 4

To make it work on Jetty 9 set attribute AnnotationConfiguration.CLASS_INHERITANCE_MAP on WebAppContext

webAppContext.setAttribute(AnnotationConfiguration.CLASS_INHERITANCE_MAP, createClassMap());

And here is how to create this map:

private ClassInheritanceMap createClassMap() {
    ClassInheritanceMap classMap = new ClassInheritanceMap();
    ConcurrentHashSet<String> impl = new ConcurrentHashSet<>();
    impl.add(MyWebAppInitializer.class.getName());
    classMap.put(WebApplicationInitializer.class.getName(), impl);
    return classMap;
}

I placed that solution on gitHub

Answer 5

The code below did the trick in my maven project:

public static void main(String[] args) throws Exception {
    Server server = new Server();
    ServerConnector scc = new ServerConnector(server);
    scc.setPort(Integer.parseInt(System.getProperty("jetty.port", "8080")));
    server.setConnectors(new Connector[] { scc });

    WebAppContext context = new WebAppContext();
    context.setServer(server);
    context.setContextPath("/");
    context.setWar("src/main/webapp");
    context.getMetaData().addContainerResource(new FileResource(new File("./target/classes").toURI()));
    context.setConfigurations(new Configuration[]{
            new WebXmlConfiguration(),
            new AnnotationConfiguration()
    });

    server.setHandler(context);

    try {
        System.out.println(">>> STARTING EMBEDDED JETTY SERVER, PRESS ANY KEY TO STOP");
        System.out.println(String.format(">>> open http://localhost:%s/", scc.getPort()));
        server.start();
        while (System.in.available() == 0) {
            Thread.sleep(5000);
        }
        server.stop();
        server.join();
    } catch (Throwable t) {
        t.printStackTrace();
        System.exit(100);
    }

}

Answer 6

Based on my testing and this thread http://forum.springsource.org/showthread.php?127152-WebApplicationInitializer-not-loaded-with-embedded-Jetty I don't think it works at the moment. If you look in AnnotationConfiguration.configure:

   parseContainerPath(context, parser);
   // snip comment
   parseWebInfClasses(context, parser);
   parseWebInfLib (context, parser);

it seems coupled to a war-like deployment rather than embedded.

Here is an example using Spring MVC and embedded Jetty that might be more useful:

http://www.jamesward.com/2012/08/13/containerless-spring-mvc

It creates the Spring servlet directly rather then relying on annotations.