validate request body java

@Entity
public class User {
     
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
     
    @NotBlank(message = "Name is mandatory")
    private String name;
     
    @NotBlank(message = "Email is mandatory")
    private String email;
     
    // standard constructors / setters / getters / toString
         
}