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<td class="page-title-pattern-first-line " style="padding: 0; 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-12976" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-777968db-de47-41e4-ad34-5e71d5241656" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12976" style="color: #3b73af; text-decoration: none">HHH-12976</a> </td>
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<td style="vertical-align: top;; padding: 0; 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-12976" style="color: #3b73af; text-decoration: none">Inconsistencies loading entity with a null association mapped with optional=false with no referential constraints</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-777968db-de47-41e4-ad34-5e71d5241656" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.3.6 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 14/Sep/2018 20:18 PM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Fix Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.4, 5.3.7 </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-ff8aba90-37b7-475b-bbdd-041edf2d8a53" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="gbadner" id="email_gbadner" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gbadner" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gail Badner</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">This involves one-to-one and many-to-one associations that are non-optional, where the associated entity ID is non-null, but there is no entity with that ID. This can only happen when there is no foreign key constraint on the association ID.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There are 3 cases where Hibernate will load an entity with a null association, even though the the association is non-optional:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">1) The mapping includes <tt>@NotFound(action = NotFoundAction.IGNORE)</tt>. For example:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> void Employment {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> id;
@ManyToOne(optional=<span class="code-keyword" style="color: #000091">false</span>)
@NotFound(action = NotFoundAction.IGNORE)
@JoinColumn(foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
<span class="code-keyword" style="color: #000091">private</span> Employee employee;
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><tt>@NotFound(action = NotFoundAction.IGNORE)</tt> is not compatible with a non-optional association. Hibernate should either throw an exception when this is detected. At the very least, <tt>@NotFound(action = NotFoundAction.IGNORE)</tt> should be ignored, and a warning should be logged.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">2) The mapping has <tt>@OneToOne(optional = false) @MapsId</tt> <tt>@Fetch(value = FetchMode.SELECT)}, with {{@JoinColumn</tt> used to override the column name. For example:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> void Employment {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> id;
@OneToOne(optional=<span class="code-keyword" style="color: #000091">false</span>)
@MapsId
@JoinColumn(name = <span class="code-quote" style="color: #009100">"FK"</span>, @JoinColumn(foreignKey=@ForeignKey(NO_CONSTRAINT)))
@Fetch(value = FetchMode.SELECT)
<span class="code-keyword" style="color: #000091">private</span> Employee employee;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">3) The mapping has <tt>@OneToOne(optional = false)</tt> with <tt>@PrimaryKeyJoinColumn</tt>, and <tt>@Fetch(value = FetchMode.SELECT)</tt>. For example:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> void Employment {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> id;
@OneToOne(optional = <span class="code-keyword" style="color: #000091">false</span>)
@PrimaryKeyJoinColumn(foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
@Fetch(value = FetchMode.SELECT)
@NotFound(action = NotFoundAction.EXCEPTION)
<span class="code-keyword" style="color: #000091">private</span> Employee employee;
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">NOTE: Currently, the foreign key constraint cannot be disabled via @JoinColumn(foreignKey=@ForeignKey(NO_CONSTRAINT)) for 2) or 3) due to <span class="jira-issue-macro" data-jira-key="HHH-12975"> <a href="https://hibernate.atlassian.net/browse/HHH-12975" class="jira-issue-macro-key issue-link" title="Foreign key constraint cannot be disabled with @JoinColumn(foreignKey=@ForeignKey(NO_CONSTRAINT)) in some cases" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12143&avatarType=issuetype"> HHH-12975 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> . When testing, the foreign key will need to be dropped, or the <tt>Employment</tt> table will have to be dropped and recreated without the foreign key.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">For cases 2) and 3), Hibernate should return null for loaded <tt>Employment</tt>, since it is impossible to have a non-null <tt>Employment.employee</tt>.</p> </td>
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