Unable to connect to Cassandra cluster running on

I have setup datastax cassandra service and have created a keyspace and my db is running fine.

Below are output from the nodetool status command:
C:\Users\xxx>cd C:\Program Files\DataStax Community\apache-cassandra\bin

C:\Program Files\DataStax Community\apache-cassandra\bin>nodetool status
Datacenter: datacenter1
========================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens       Owns (effective)  Host ID                               Rack
UN  127.0.0.1  229 KB     256          100.0%            d5229669-f8f2-4b06-a887-4ab91a883a74  rack1


Also , the data is created having a keyspace.
cqlsh:axiaglobal> use axiaglobal;
cqlsh:axiaglobal> describe tables;

greetings

cqlsh:axiaglobal> select * from greetings;

 user | id | creation_date | greet
------+----+---------------+-------

Now when i try to connect to cassandra via Java i get the following exception:

com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.1:9042 (null))
    at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:196)
    at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
    at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1104)
    at com.datastax.driver.core.Cluster.init(Cluster.java:121)
    at com.datastax.driver.core.Cluster.connect(Cluster.java:198)
    at com.datastax.driver.core.Cluster.connect(Cluster.java:226)
    at com.axia.global.dao.cassandra.service.CassandraApp.main(CassandraApp.java:29)


Piece of code which makes a call to Cassandra is listed below:

package com.axia.global.dao.cassandra.service;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.CassandraTemplate;

import com.axia.global.model.cassandra.Person;
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Session;
import com.datastax.driver.core.querybuilder.QueryBuilder;
import com.datastax.driver.core.querybuilder.Select;

public class CassandraApp {

     private static final Logger LOG = LoggerFactory.getLogger(CassandraApp.class);

     private static Cluster cluster;
     private static Session session;

     public static void main(String[] args) {

      try {
       cluster = Cluster.builder().addContactPoints("127.0.0.1").build();

       session = cluster.connect("axiaglobal");

       CassandraOperations cassandraOps = new CassandraTemplate(session);

       Select s = QueryBuilder.select().from("greetings");


      } catch (Exception e) {
       e.printStackTrace();
      }

     }
    }

I am unable to understand where i am going wrong and why my connection is failing to connect to cassandra can some one help me out with it ?

I have tried setting up the following: rpc_address: 0.0.0.0 broadcast_rpc_address: 1.2.3.4 and even it did not work.

Did you check you have the correct java Driver for your Cassandra version? what version of driver and Cassandra are you using?

Check here https://docs.datastax.com/en/developer/driver-matrix/doc/javaDrivers.html