Java Cassandra connectivity

Question

I'm getting java.lang.NoClassDefFoundError which is caused by java.lang.ClassNotFoundException. I have added cassandra-driver-core-2.1.7.jar in build path. No compile time error but during runtime I'm getting above exception.

public class SimpleClient {
       private Cluster cluster;    
       public void connect(String node) {
           System.getProperties();
           try{
              cluster = Cluster.builder() ---> Here I'm getting java.lang.NoClassDefFoundError
                    .addContactPoint(node).build();
              Metadata metadata = cluster.getMetadata();
              System.out.printf("Connected to cluster: %s\n", 
                    metadata.getClusterName());
              for ( Host host : metadata.getAllHosts() ) {
                 System.out.printf("Datatacenter: %s; Host: %s; Rack: %s\n",
                       host.getDatacenter(), host.getAddress(), host.getRack());
              }
           }catch(Exception e){
               System.out.println(e.getMessage());
           }
       }

       public void close() {
          cluster.close();
       }

       public static void main(String[] args) {
          SimpleClient client = new SimpleClient();
          System.getProperties();
          client.connect("127.0.0.1");
          client.close();
       }
    }