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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-9509" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-eac8f7cd-9fe0-42b6-99ad-5fd5014243cc" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9509" style="color: #3b73af; text-decoration: none">HHH-9509</a>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="steve" id="email_steve" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ebersole</a>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">Github project to reproduce: [https://raw.githubusercontent.com/tmonney/hibernate-mapsid]<br /><br />Suppose a pair of entities defined with the same composite primary key:<br /><br />{code:title=Parent.java}<br />@Entity<br />public class Parent {<br /> @EmbeddedId<br /> public Key id;<br /><br /> @OneToOne(cascade = CascadeType.ALL, mappedBy = "parent")<br /> public Child child;<br /><br /> @Basic<br /> public String value;<br />}<br />{code}<br /><br />{code:title=Child.java}<br />@Entity<br />public class Child {<br /> @EmbeddedId<br /> private Key id;<br /><br /> @OneToOne<br /> @MapsId<br /> @JoinColumns({<br /> @JoinColumn(name = "id1", referencedColumnName = "id1"),<br /> @JoinColumn(name = "id2", referencedColumnName = "id2")<br /> })<br /> public Parent parent;<br /><br /> @Basic<br /> public String value;<br />}<br />{code}<br /><br />{code:title=Key.java}<br />@Embeddable<br />public class Key implements Serializable {<br /><br /> private static final long serialVersionUID = 1L;<br /><br /> @Column(name = "id1")<br /> public Long id1;<br /><br /> @Column(name = "id2")<br /> public Long id2;<br /><br /> public Key() {<br /> }<br /><br /> public Key(Long id1, Long id2) {<br /> this.id1 = id1;<br /> this.id2 = id2;<br /> }<br /><br /> @Override<br /> public int hashCode() {<br /> return Objects.hash(id1, id2);<br /> }<br /><br /> @Override<br /> public boolean equals(Object obj) {<br /> if (!(obj instanceof Key)) {<br /> return false;<br /> }<br /> Key that = (Key) obj;<br /> return Objects.equals(this.id1, that.id1) && Objects.equals(this.id2, that.id2);<br /> }<br />}<br />{code}<br /><br />The bug manifests itself when loading a {{Parent}} entity, getting its {{child}}, modifying some of its fields and finally flushing the entity manager:<br />{noformat}<br />Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1<br />{noformat}<br /><br />This is because Hibernates executes the following query:<br />{code:sql}<br />update FailingChild set value=? where id1=? and id2=?<br />{code}<br />And passes the *same value* for {{id1}} and {{id2}}, which is obviously wrong.<br /><br />Interestingly enough, everything works OK if the mapping of the {{</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">{</span> <span class="diffcontext">Child}} class is changed as follows (notice the second join column of the parent is renamed):<br />{code:title=Child.java}<br />@Entity<br />public class Child {<br /> @EmbeddedId<br /> public Key id;<br /><br /> @OneToOne<br /> @MapsId<br /> @JoinColumns({<br /> @JoinColumn(name = "id1", referencedColumnName = "id1"),<br /> @JoinColumn(name = "renamed_id2", referencedColumnName = "id2")<br /> })<br /> public Parent parent;<br /><br /> @Basic<br /> public String value;<br />}<br />{code}</span>
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