Getting exception in simple JXTA 2.7 Application

I am developing a simple program in JXTA 2.7 and it is showing me the following error.

public static void main(String[] args) throws IOException, PeerGroupException {
        System.setProperty(Logging.JXTA_LOGGING_PROPERTY, Level.OFF.toString());
        NetworkManager manager = new NetworkManager(NetworkManager.ConfigMode.EDGE, "Test");
        System.out.println(" S t a r t ing JXTA");
        manager.startNetwork();
        System.out.println(" JXTA St a r t ed ");            
}

Error:

Exception in thread "main" java.lang.NoClassDefFoundError: org/jboss/netty/channel/socket/httptunnel/HttpTunnelClientChannelFactory
    at net.jxta.impl.endpoint.netty.http.NettyHttpTunnelTransport.createClientSocketChannelFactory(NettyHttpTunnelTransport.java:27)
    at net.jxta.impl.endpoint.netty.NettyTransport.initClient(NettyTransport.java:124)
    at net.jxta.impl.endpoint.netty.NettyTransport.init(NettyTransport.java:76)
    at net.jxta.impl.peergroup.GenericPeerGroup.loadModule(GenericPeerGroup.java:677)
    at net.jxta.impl.peergroup.GenericPeerGroup.loadModule(GenericPeerGroup.java:801)
    at net.jxta.impl.peergroup.StdPeerGroup.loadAllModules(StdPeerGroup.java:295)
    at net.jxta.impl.peergroup.StdPeerGroup.initFirst(StdPeerGroup.java:842)
    at net.jxta.impl.peergroup.Platform.initFirst(Platform.java:214)
    at net.jxta.impl.peergroup.GenericPeerGroup.init(GenericPeerGroup.java:907)
    at net.jxta.peergroup.WorldPeerGroupFactory.newWorldPeerGroup(WorldPeerGroupFactory.java:312)
    at net.jxta.peergroup.WorldPeerGroupFactory.<init>(WorldPeerGroupFactory.java:182)
    at net.jxta.peergroup.NetPeerGroupFactory.<init>(NetPeerGroupFactory.java:203)
    at net.jxta.platform.NetworkManager.startNetwork(NetworkManager.java:408)
    at jxta_my.JXTA_My.main(JXTA_My.java:36)
Caused by: java.lang.ClassNotFoundException: org.jboss.netty.channel.socket.httptunnel.HttpTunnelClientChannelFactory
......

I am not able to figure out what is going wrong here. I have downloaded the missing libraries jetty and has given it into the library path(netbeans 7.0.1). Anyone please help me out.

You need to include netty into your classpath. You can get it from netty.io website.