java.net.BindException: Address already in use But process keeps on running

Hi,
I am using embedded jetty to start my spring MVC project. Here is my main file :

package org.directi.code;

import org.apache.log4j.PropertyConfigurator;
import org.apache.tomcat.InstanceManager;
import org.apache.tomcat.SimpleInstanceManager;
import org.eclipse.jetty.annotations.ServletContainerInitializersStarter;
import org.eclipse.jetty.apache.jsp.JettyJasperInitializer;
import org.eclipse.jetty.plus.annotation.ContainerInitializer;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.util.log.JavaUtilLog;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.webapp.WebAppContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;

import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

public class AppStart {
    private int port;
    private Server server;

    public static void main(String[] args) throws Exception {
        String env = System.getProperty("FLOCK_APPS_CONFIG");
        Properties props = new Properties();
        props.load(AppStart.class.getResourceAsStream("/properties/" + env + "/jetty.properties"));
        int port = Integer.parseInt(props.getProperty("port"));
        AppStart appStart = new AppStart(port);
        appStart.start();
        appStart.waitForInterrupt();
    }

    public AppStart(int port) {
        this.port = port;
    }

    public void start() throws Exception {
        server = new Server();
        ServerConnector connector = connector();
        server.addConnector(connector);
        WebAppContext webAppContext = getWebAppContext();
        server.setHandler(webAppContext);
        server.start();
    }

    private ServerConnector connector() {
        ServerConnector connector = new ServerConnector(server);
        connector.setPort(port);
        return connector;
    }

    private WebAppContext getWebAppContext() throws IOException {
        WebAppContext context = new WebAppContext();
        context.setContextPath("/");
        context.setDescriptor("webapp/WEB-INF/web.xml");
        context.setAttribute("org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern",
                ".*/[^/]*servlet-api-[^/]*\\.jar$|.*/javax.servlet.jsp.jstl-.*\\.jar$|.*/.*taglibs.*\\.jar$");
        context.setResourceBase(new ClassPathResource("webapp").getURI().toString());
        context.setAttribute("org.eclipse.jetty.containerInitializers", jspInitializers());
        context.setAttribute(InstanceManager.class.getName(), new SimpleInstanceManager());
        context.addBean(new ServletContainerInitializersStarter(context), true);
        context.setClassLoader(getUrlClassLoader());
        return context;
    }

    private List<ContainerInitializer> jspInitializers() {
        JettyJasperInitializer sci = new JettyJasperInitializer();
        ContainerInitializer initializer = new ContainerInitializer(sci, null);
        List<ContainerInitializer> initializers = new ArrayList<ContainerInitializer>();
        initializers.add(initializer);
        return initializers;
    }

    private ClassLoader getUrlClassLoader() {
        ClassLoader jspClassLoader = new URLClassLoader(new URL[0], this.getClass().getClassLoader());
        return jspClassLoader;
    }

    public void stop() throws Exception {
        server.stop();
    }

    public void waitForInterrupt() throws InterruptedException {
        server.join();
    }
}

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I start the application like :

java -DFLOCK_APPS_CONFIG=staging -jar target/snippet.jar >>./snippet2.log 2>&1 &

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In the log file i see the following output :

Exception in thread "main" java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind0(Native Method)
	at sun.nio.ch.Net.bind(Net.java:433)
	at sun.nio.ch.Net.bind(Net.java:425)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:326)
	at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
	at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:244)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.server.Server.doStart(Server.java:384)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.directi.code.AppStart.start(AppStart.java:54)
	at org.directi.code.AppStart.main(AppStart.java:35)

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Now ideally my process should have shutdown. But i see the process running when i do
ps -ef | grep snippet
502 35205 34773   0  6:47PM ttys001    0:04.82 /usr/bin/java -DFLOCK_APPS_CONFIG=staging -jar target/snippet.jar

Even after the Exception is thrown. How can i make it stop if this happens .

Thanks