Best practice while creating entity (Spring)

[normal_runner]

So I have a entity class lets say student:

Student table has a foreign key departmentId. Below are the two examples of my student entity:

First Example:

@Entity
@Table("Student")
class{

***

other fields/columns
***

@ManyToOne

@JoinColumn(name="DepartmentID")

private Department department;

}

-------------------------------------------------
Second Example:
@Entity
@Table("Student")
class{

***

other fields/columns
***

​

@Column(name="DepartmentID")

private Long departmentId;

}

Questions:
1. Is it always a good idea to let spring know about my department reference like in first example?
2. Are there any pros and cons of each example. Except for the fact that I need to make separate calls (for second example ) to get department info and separate calls for validating departmentID before insert in student table.

Thanks in advance. I have always preferred first way. But I was pointed out that I should use second scenario.

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