无法从Java客户端连接Neo4j

import org.neo4j.driver.*;

public class Neo4jExample {
    public static void main(String[] args) {
        // 创建一个驱动程序实例
        Driver driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("username", "password"));

        // 创建一个会话对象
        try (Session session = driver.session()) {
            // 执行Cypher查询语句
            Result result = session.run("MATCH (n) RETURN n LIMIT 5");

            // 处理查询结果
            while (result.hasNext()) {
                Record record = result.next();
                System.out.println(record.get("n").asNode().asMap());
            }
        }

        // 关闭驱动程序
        driver.close();
    }
}