我正在尝试创建一个简单的java应用程序，它可以连接到在本地机器上运行的docker容器中运行的cassandra。为了我的生命，我不能让它连接到容器！
我要这样启动我的容器。

docker run -p 9042:9042 cassandra:latest

我的java代码并不是很花哨。。

private Cluster cluster;
    private Session session;
    String serverIP = "localhost";

    String username = "cassandra";
    String password = "cassandra";
    String keyspace = "DefaultKeyspace";
    public static void main(String[] args) {
        CassandraTest cassandraTest = new CassandraTest();
        cassandraTest.connect("localhost");
    }

    public void connect(String node) {

        try {
            String username = "cassandra";
            String password = "cassandra";
            String keyspace = "DefaultKeyspace";

            cluster = Cluster.builder()
                    .addContactPoints(serverIP).withCredentials(username.trim(), password.trim())
                    .build();

            session = cluster.connect(keyspace);

            //  createSchema();
            Metadata metadata = cluster.getMetadata();
            System.out.println("Connected to cluster:" + metadata.getClusterName());
            for (Host host : metadata.getAllHosts()) {
                System.out.println("Datatacenter: " + host.getDatacenter()
                        + "; Host: " + host.getAddress() + "; Rack: "
                        + host.getRack());
            }
        } catch (Exception e) {

            e.printStackTrace();
        }
        getSession();
        createSchema();
    }

但我不知道我该怎么做，我一直得到这个。。

com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: localhost/127.0.0.1:9042 (com.datastax.driver.core.exceptions.InvalidQueryException: unconfigured table schema_keyspaces))
    at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:220)
    at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:78)
    at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1231)
    at com.datastax.driver.core.Cluster.init(Cluster.java:158)
    at com.datastax.driver.core.Cluster.connect(Cluster.java:246)
    at com.datastax.driver.core.Cluster.connect(Cluster.java:279)
    at CassandraTest.connect(CassandraTest.java:37)
    at CassandraTest.main(CassandraTest.java:27)
Exception in thread "main" java.lang.IllegalStateException: Can't use this Cluster instance because it was previously closed
    at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1213)
    at com.datastax.driver.core.Cluster.init(Cluster.java:158)
    at com.datastax.driver.core.Cluster.connect(Cluster.java:246)
    at CassandraTest.getSession(CassandraTest.java:56)
    at CassandraTest.connect(CassandraTest.java:51)
    at CassandraTest.main(CassandraTest.java:27)

我也尝试过使用docker主机ip。如何连接？？