Validation doesn't work on EntityManager.merge()

Question

I have few validations on my entity, like @NotNull, and some generation, like

@Id
@GeneratedValue(strategy = AUTO)
@Column(name = "ID")
private Long id;

@Column
@GeneratedValue(strategy = GenerationType.AUTO)
private Long referenceNumber;

However when calling EntityManager.merge() this values are not generated. Null fields with @NotNull annotation are passed without any complain. Even id is not generated.

Should I switch this generation on somehow? How, and where?

Answer 1

Merge() does not invoke pre-insert/pre-update event listeners by default. flush() after the merge() should do it.