public class User {
    String name;
    String email;
    String profession;
    Integer age;

    // constructor

    // setters and getters
}

User user1 = new User ("Name", "email@email.com");
User user2 = new User ("Name2", "email2@email.com");

List<User> userList = new ArrayList<>();
userList.add(user1);
userList.add(user2);

JavaRDD<User> usersRDD = sc.parallelize(userList);

User user3 = new User ("email@email.com", "Software Engineer", 26);
User user4 = new User ("email2@email.com", "Lawyer", 35);

List<User> userList2 = new ArrayList<>();
userList.add(user3);
userList.add(user4);

JavaRDD<User> usersRDD = sc.parallelize(userList2);

User user1and3 = new User (
        "Name",
        "email@email.com",
        "Software Engineer",
        26);

User user2and4 = new User (
        "Name2",
        "email2@email.com",
        "Lawyer",
        35);