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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-10454" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-8b62e4a3-e6e4-435b-bc12-296e83627f39" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10454" style="color: #3b73af; text-decoration: none">HHH-10454</a> </td>
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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"> 5.0.4 </td>
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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"> hibernate-core </td>
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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"> 16/Jan/2016 12:55 PM </td>
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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"> Java 1.8, Derby DB 10.12.1.1 </td>
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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="Madhusudana Reddy Sunnapu" id="email_Madhusudana Reddy Sunnapu" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=Madhusudana+Reddy+Sunnapu" style="color:#6c797f;; color: #3b73af; text-decoration: none">Madhusudana Reddy Sunnapu</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">I have two entities Post and PostDetails that are mapped as OneToOne with shared primary key, optional=false and id generator strategy set as IDENTITY. When I try to persist the Post entity it fails with following exception "org.hibernate.id.IdentifierGenerationException: null id generated for:class com.demo.hibernate.PostDetails".</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Assuming we have following entities Post and PostDetails mapped as OneToOne with shared primary key, optional=false and id generator strategy set as IDENTITY as below</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 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> class Post <span class="code-keyword" style="color: #000091">implements</span> Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> id;
@OneToOne(mappedBy=<span class="code-quote" style="color: #009100">"post"</span>, cascade = { CascadeType.ALL }, optional=<span class="code-keyword" style="color: #000091">false</span>)
<span class="code-keyword" style="color: #000091">private</span> PostDetails details;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">long</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id;
}
<span class="code-keyword" style="color: #000091">public</span> PostDetails getDetails() {
<span class="code-keyword" style="color: #000091">return</span> details;
}
<span class="code-keyword" style="color: #000091">public</span> void addDetails(PostDetails details) {
<span class="code-keyword" style="color: #000091">this</span>.details = details;
details.setPost(<span class="code-keyword" style="color: #000091">this</span>);
}
<span class="code-keyword" style="color: #000091">public</span> void deleteDetails() {
<span class="code-keyword" style="color: #000091">if</span>(details !=<span class="code-keyword" style="color: #000091">null</span>) {
details.setPost(<span class="code-keyword" style="color: #000091">null</span>);
}
<span class="code-keyword" style="color: #000091">this</span>.details = <span class="code-keyword" style="color: #000091">null</span>;
}
}
@Entity
<span class="code-keyword" style="color: #000091">public</span> class PostDetails <span class="code-keyword" style="color: #000091">implements</span> Serializable {
@Id
@Column
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> id;
@OneToOne
@JoinColumn(name=<span class="code-quote" style="color: #009100">"id"</span>)
@MapsId
<span class="code-keyword" style="color: #000091">private</span> Post post;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">long</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id;
}
<span class="code-keyword" style="color: #000091">public</span> Post getPost() {
<span class="code-keyword" style="color: #000091">return</span> post;
}
<span class="code-keyword" style="color: #000091">public</span> void setPost(Post post) {
<span class="code-keyword" style="color: #000091">this</span>.post = post;
}
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When I execute the following test case to save the entities,</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Test
<span class="code-keyword" style="color: #000091">public</span> void persistPost() {
Session session = sf.getCurrentSession();
session.getTransaction().begin();
Post post = <span class="code-keyword" style="color: #000091">new</span> Post();
PostDetails details = <span class="code-keyword" style="color: #000091">new</span> PostDetails();
post.addDetails(details);
session.persist(post);
session.beginTransaction().commit();
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">It fails to save and throws the following exception:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
org.hibernate.id.IdentifierGenerationException: <span class="code-keyword" style="color: #000091">null</span> id generated <span class="code-keyword" style="color: #000091">for</span>:class com.demo.hibernate.PostDetails
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The same code works if I change the generator strategy to AUTO from IDENTITY or change to optional=true as below.</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Changing
@GeneratedValue(strategy = GenerationType.IDENTITY)
to
@GeneratedValue(strategy = GenerationType.AUTO)
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">OR</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Changing
@OneToOne(mappedBy=<span class="code-quote" style="color: #009100">"post"</span>, cascade = { CascadeType.ALL }, optional=<span class="code-keyword" style="color: #000091">false</span>)
to
@OneToOne(mappedBy=<span class="code-quote" style="color: #009100">"post"</span>, cascade = { CascadeType.ALL }, optional=<span class="code-keyword" style="color: #000091">true</span>)
</pre>
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