listeners do Hibernate

snapshot.java

/**
     * The datetime that this record is created.
     */
    @NotNull
    @Temporal(TemporalType.TIMESTAMP)
    private Date creationDate;

    /**
     * The datetime that this record is modified.
     */
    @NotNull
    @Temporal(TemporalType.TIMESTAMP)
    private Date lastModificationDate;

    @PrePersist
    public void whenInsert() {
        creationDate = new Date();
        lastModificationDate = new Date();
    }

    @PreUpdate
    public void whenUpdate() {
        lastModificationDate = new Date();
    }