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POJPA/Hibernate preUpdate doesn't update parent object
 

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    <p>In my application I defined following classes:</p> <pre><code>@Entity @Table(name = "forums") public class Forum { @Id @GeneratedValue(generator = "system-uuid") @GenericGenerator(name = "system-uuid", strategy = "uuid") private String id; private String name; private Date lastActivity; @OneToMany(mappedBy = "forum", cascade = { CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE }) private List&lt;Post&gt; posts; </code></pre> <hr> <pre><code>@Entity @Table(name = "posts") public class Post { @Id @GeneratedValue(generator = "system-uuid") @GenericGenerator(name = "system-uuid", strategy = "uuid") private String id; private String username; private String content; private Date creationDate; @ManyToOne(optional = false, cascade = { CascadeType.MERGE, CascadeType.PERSIST }) private Forum forum; public Post() { creationDate = new Date(); } @PrePersist private void onPersist() { System.out.println(getClass().getName() + ": onPersist"); if (creationDate == null) { creationDate = new Date(); } forum.setLastActivity(creationDate); } @PreUpdate private void onUpdate() { forum.setLastActivity(new Date()); } </code></pre> <p>If I try adding new posts to forum entity, <code>lastActivity</code> field is correctly updated in database by <code>@PrePersist</code> callback. But if I try to update post entity using following code:</p> <pre><code> entityManager.getTransaction().begin(); Post post = entityManager.find(Post.class, "postId"); post.setContent("New post text"); entityManager.merge(post); entityManager.getTransaction().commit(); </code></pre> <p>only post data are updated and <code>lastActivity</code> field value doesn't change. In my opinion <code>@PreUpdate</code> method should do the trick and update Forum entity. Is this a bug or am I missing something?</p>
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