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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-7b129526-55a3-4f96-a87b-a5e4335b1a47" 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="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-9509" style="color: #3b73af; text-decoration: none">Wrong handling of composite primary key with @MapsId</a> </span>
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Issue Type:
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Affects Versions:
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4.3.7
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Unassigned
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Created:
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18/Nov/2014 04:36 AM
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Priority:
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Reporter:
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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="tmonney" id="email_tmonney" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=tmonney" style="color:#6c797f;; color: #3b73af; text-decoration: none">Thierry Monney</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Github project to reproduce: <a href="https://raw.githubusercontent.com/tmonney/hibernate-mapsid" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://raw.githubusercontent.com/tmonney/hibernate-mapsid</a></p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Suppose a pair of entities defined with the same composite primary key:</p> {code|title=Parent.java}
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">@Entity<br /> public class Parent </p> { @EmbeddedId public Key id; @OneToOne(cascade = CascadeType.ALL, mappedBy = "parent") public Child child; @Basic public String value; }
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
{code|title=Child.java}
@Entity
<span class="code-keyword" style="color: #000091">public</span> class Child {
@EmbeddedId
<span class="code-keyword" style="color: #000091">private</span> Key id;
@OneToOne
@MapsId
@JoinColumns({
@JoinColumn(name = <span class="code-quote" style="color: #009100">"id1"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"id1"</span>),
@JoinColumn(name = <span class="code-quote" style="color: #009100">"id2"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"id2"</span>)
})
<span class="code-keyword" style="color: #000091">public</span> Parent parent;
@Basic
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> value;
}
</pre>
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</div> {code|title=Key.java}
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">@Embeddable<br /> public class Key implements Serializable {</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> private static final long serialVersionUID = 1L;</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @Column(name = "id1")<br /> public Long id1;</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @Column(name = "id2")<br /> public Long id2;</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> public Key() {<br /> }</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> public Key(Long id1, Long id2) </p> { this.id1 = id1; this.id2 = id2; }
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @Override<br /> public int hashCode() </p> { return Objects.hash(id1, id2); }
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @Override<br /> public boolean equals(Object obj) {<br /> if (!(obj instanceof Key)) </p> { return false; }
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> Key that = (Key) obj;<br /> return Objects.equals(this.id1, that.id1) && Objects.equals(this.id2, that.id2);<br /> }<br /> }</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
The bug manifests itself when loading a {{Parent}} entity, getting its {{child}}, modifying some of its fields and <span class="code-keyword" style="color: #000091">finally</span> flushing the entity manager:
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Batch update returned unexpected row count from update <span class="error">[0]</span>; actual row count: 0; expected: 1</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
This is because Hibernates executes the following query:
{code:sql}
update FailingChild set value=? where id1=? and id2=?
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">And passes the <b>same value</b> for <tt>id1</tt> and <tt>id2</tt>, which is obviously wrong.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Interestingly enough, everything works OK if the mapping of the {<tt>Child</tt> class is changed as follows (notice the second join column of the parent is renamed):</p> {code|title=Child.java}
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">@Entity<br /> public class Child {<br /> @EmbeddedId<br /> public Key id;</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @OneToOne<br /> @MapsId<br /> @JoinColumns(</p> { @JoinColumn(name = "id1", referencedColumnName = "id1"), @JoinColumn(name = "renamed_id2", referencedColumnName = "id2") }
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">)<br /> public Parent parent;</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @Basic<br /> public String value;<br /> }</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal"></pre>
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