Use @JsonManagedReference and @JsonBackReference:

• @JsonManagedReference is used on the parent side of the relationship.
• @JsonBackReference is used on the child side to break the recursion.

For example, in your User and IDCard classes:

@OneToOne(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
    @JsonManagedReference
    private IDCard idCard;

 @OneToOne
    @JoinColumn(name = "user_id")
    @JsonBackReference
    private User user;

Or use @JsonIgnore in IDCard class:

@OneToOne
@JoinColumn(name = "user_id")
@JsonIgnore
private User user;