相关疑难解决方法(0)

我有一个简单的Spring Boot Web应用程序.我正在尝试从服务器接收一些数据.Controller返回一个集合,但浏览器接收空JSON - 大括号的数量等于来自服务器的对象数,但其内容为空.

@RestController
public class EmployeeController {

@Autowired
private EmployeeManagerImpl employeeManagerImpl;

    @RequestMapping(path="/employees", method = RequestMethod.GET)
    public Iterable<Employee> getAllEmployees() {
        Iterable<Employee> employeesIterable = employeeManagerImpl.getAllEmployees();
        return employeesIterable;
    }
}

该方法触发,浏览器显示:

在控制台中没有更多.有任何想法吗？

编辑:Employee.java

@Entity
public class Employee implements Serializable{

    private static final long serialVersionUID = -1723798766434132067L;

    @Id
    @Getter @Setter 
    @GeneratedValue
    private Long id;

    @Getter @Setter
    @Column(name = "first_name")
    private String firstName;

    @Getter @Setter
    @Column(name = "last_name")
    private String lastName;

    @Getter @Setter
    private BigDecimal salary;

    public Employee(){

    }
}