我有一个班级服务和一个班级雇员 Service.java ```
import lombok.Data;
import javax.persistence.*;

@Data
@Table(name = "services")
@Entity
public class ServiceResource {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
private String date;
private String longitude;
private String latitude;
@ManyToOne
@JoinColumn(name="employee_id")
private EmployeeResource employee;

}
`Employee.java`
import lombok.Data;
import javax.persistence.*;

@Data
@Table(name = "employees")
@Entity
public class EmployeeResource {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
private String longitude;
private String latitude;

}

现在我想构建一个应用程序，用jpa完成服务和雇员之间的Map。这可能吗？怎么可能？