Spring Boot java.sql.SQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails

Question

I've been getting this error and having a difficult time solving this issue.

The decent amount of stackoverflow questions in regards to this topic haven't helped me to resolve this error.

I am following a sprint-boot security tutorial in which the objective i'm trying to accomplish is to sign up a new user and test out authentication for the new user.

Can someone help me with this problem ?

ERROR:

java.sql.SQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (polling_app.user_roles, CONSTRAINT FK55itppkw3i07do3h7qoclqd4k FOREIGN KEY (user_id) REFERENCES user (id)) at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:117) ~[mysql-connector-java-8.0.22.jar:8.0.22]

Date Audit - parent class:

@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
@JsonIgnoreProperties(
        value = {"createdAt", "updatedAt"},
        allowGetters = true
)

public class DateAudit implements Serializable {

    @CreatedDate
    @Column(nullable = false, updatable = false)
    private Instant createdAt;

    @LastModifiedDate
    @Column(nullable = false)
    private Instant updatedAt;

    public Instant getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(Instant createdAt) {
        this.createdAt = createdAt;
    }

    public Instant getUpdatedAt() {
        return updatedAt;
    }

    public void setUpdatedAt(Instant updatedAt) {
        this.updatedAt = updatedAt;
    }
}

User - Model class:

@Entity
@Table(name = "users", uniqueConstraints = {
        @UniqueConstraint(columnNames = {
                "username"
        }),
        @UniqueConstraint(columnNames = {
                "email"
        })
})
public class User extends DateAudit {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotBlank
    @Size(max = 40)
    private String name;

    @NotBlank
    @Size(max = 15)
    private String username;

    @NaturalId
    @NotBlank
    @Size(max = 40)
    @Email
    private String email;

    @NotBlank
    @Size(max = 100)
    private String password;

    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name = "user_roles",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id"))
    private Set<Role> roles = new HashSet<>();

    public User() {

    }

    public User(String name, String username, String email, String password) {
        this.name = name;
        this.username = username;
        this.email = email;
        this.password = password;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }

}

Also, here is an image of the tables in my docker container

Answer 1

等待大神答复