Error: The given id must not be null for GeneratedValue in JPA

java rest jpa spring-boot spring-rest
Anil Bhaskar picture Anil Bhaskar · Jul 26, 2017 · Viewed 28.2k times · Source

My object:

@Entity
@Table(name="user")
public class User {
    @Id
    @Column(name="uid")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;

  //more code
 }

When I POST user JSON without uid, I am getting error as the given id must not be null. Which should not be the case while uid should be generated by the database. Please point what am I missing.

JSON:

{
"email": "[email protected]",
"name": "John Doe",
"phone": "98-765-4445"
}

Error:

{
"timestamp": 1501058952038,
"status": 500,
"error": "Internal Server Error",
"exception": "org.springframework.dao.InvalidDataAccessApiUsageException",
"message": "The given id must not be null!; nested exception is java.lang.IllegalArgumentException: The given id must not be null!",
"path": "/api/user/"
}

Answer

Anil Bhaskar picture Anil Bhaskar · Jul 26, 2017

It was my bad, I was calling foo(user.getId()) before persisting the User object. Anyways, take aways from this; @GeneratedValue(strategy=GenerationType.IDENTITY) is a correct code and it generates identical ids while persisting. And Long is not a problem. Thanks.

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