Friday, December 16, 2011

Running Wicket on Jetty

If you're only using the web functionality provided by an application server, or you want to optimize HTTP performance, it would be a good idea to consider embedding the Jetty HTTP server inside your application. This way, you don't even have to generate a WAR-file and a web.xml file. The application is just a basic Java application, which you can run on any server with a Java VM.

Maven setup

If you're using a Maven project, add the following dependencies to the pom-file in the "dependencies"-element in order to start working right away:

<dependency>
  <groupId>org.mortbay.jetty</groupId>
  <artifactId>jetty-hightide</artifactId>
  <version>8.0.4.v20111024</version>
</dependency>

<dependency>
  <groupId>org.apache.wicket</groupId>
  <artifactId>wicket-core</artifactId>
  <version>1.5.3</version>
</dependency>

Minimal Wicket application

For our example, we use a minimal Wicket application that consists of one page.

The ExampleWicketApplication.java file:
package com.javaeenotes;


import org.apache.wicket.Page;
import org.apache.wicket.protocol.http.WebApplication;


public class ExampleWicketApplication extends WebApplication {

    @Override
    public Class<? extends Page> getHomePage() {
        return HomePage.class;
    }
}
The HomePage.java file:
package com.javaeenotes;


import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.basic.Label;


public class HomePage extends WebPage {
    public HomePage() {
        add(new Label("message", "Hello World!"));
    }
}
The HomePage.html file:
<html>
<body>
  <span wicket:id="message"></span>
</body>
</html>

The final class we need is a main class with the static main-method, in which we tie the Wicket servlet to the Jetty server.

The Main.java file:
package com.javaeenotes;


import org.apache.wicket.protocol.http.WicketFilter;
import org.apache.wicket.protocol.http.WicketServlet;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.bio.SocketConnector;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.webapp.WebAppContext;


public class Main {
    public static void main(String[] args) {
        // Object that holds, and configures the WicketServlet.
        ServletHolder servletHolder =
                new ServletHolder(new WicketServlet());
        servletHolder.setInitParameter(
                "applicationClassName",
                "com.javaeenotes.ExampleWicketApplication");
        servletHolder.setInitParameter(
                WicketFilter.FILTER_MAPPING_PARAM, "/*");
        servletHolder.setInitOrder(1);

        // Web context configuration.
        WebAppContext context = new WebAppContext();
        context.addServlet(servletHolder, "/*");
        context.setResourceBase("."); // Web root directory.

        // The HTTP-server on port 8080.
        Server server = new Server();
        SocketConnector connector = new SocketConnector();
        connector.setPort(8080);
        server.setConnectors(new Connector[]{connector});
        server.setHandler(context);

        try {
            // Start HTTP-server.
            server.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Run the main method in a VM, and connect to port 8080 with a browser to check that the application is working.

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