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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-10656" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-88db7ed8-bd27-472d-a825-ee275128e7df" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10656" style="color: #3b73af; text-decoration: none">HHH-10656</a> </td>
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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-10656" style="color: #3b73af; text-decoration: none">it is used hibernate_sequence instead of mySequence (with Oracle and H2)</a> </span> </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">Issue Type:</th>
<td class="has-icon" style="padding: 0px; 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-88db7ed8-bd27-472d-a825-ee275128e7df" 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.0.7 </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"> Unassigned </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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<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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 29/Mar/2016 06:13 AM </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">Environment:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> H2 and Oracle </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="pvitale" id="email_pvitale" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=pvitale" style="color:#6c797f;; color: #3b73af; text-decoration: none">Pasquale Vitale</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 updated the hiberate version from 4.0.1.Final to 5.0.7.Final.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Problem:</b><br> The hibernate framwork uses hibernate_sequence for the id generation instead of mySequence.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Hibernate configuration:</b><br> In order to maintain the backward compatibility, hibernate.id.new_generator_mappings is configured as false value.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Entity configuration:</b><br> The id field is annotated with the following JPA API:</p>
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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">
@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = <span class="code-quote" style="color: #009100">"myGenerator"</span>)
@SequenceGenerator(name = <span class="code-quote" style="color: #009100">"myGenerator"</span>, sequenceName = <span class="code-quote" style="color: #009100">"MY_GENERATOR_SEQ"</span>)
@Column(name=<span class="code-quote" style="color: #009100">"ID"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>DB configuration:</b><br> The MY_GENERATOR_SEQ sequence is defined with the "INCREMENT BY 1" option.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The problem occurs for both H2 and Oracle DB.</p>
<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0"><b>QUESTION:</b><br> I have analyzed the implementation and I don't know if it could be a BUG of Hibernate or any possible bad configuration i did for the backward compatibility???</p>
</blockquote> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Analysis:</b><br> Hibernate during server startup gets some initialization:<br> SequenceStyleGenerator.configure method defines the QualifiedName sequenceName as "hibernate_sequence", because it tried to get the value from the Properties params.<br> At this point I noticed that the MY_GENERATOR_SEQ sequenceName was present into the Properties params at runtime with the "sequence" key (sequence=MY_GENERATOR_SEQ) but the retrieve strategy (determineSequenceName) needs the "sequence_name" as key.<br> So the key used to set the sequence name into the Properties params is from the deprecated class org.hibernate.id.SequenceGenerator.SEQUENCE because of hibernate.id.new_generator_mappings=false, <br> but the SequenceStyleGenerator class needs the org.hibernate.id.enhanced.SequenceStyleGenerator.SEQUENCE_PARAM key in order to get "MY_GENERATOR_SEQ".</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Potential solutions:<br> 1. set on SequenceGenerator allocationSize=1 (without setting hibernate.id.new_generator_mappings=false)<br> 2. create the sequence MY_GENERATOR_SEQ on the DB with INCREMENT BY 50 (without setting hibernate.id.new_generator_mappings=false)</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Both the solutions are not applicable into my context.<br> So the only applicable "solution" is this one:<br> Extend the Dialect used for Oracle and H2 and override the getNativeIdentifierGeneratorClass method in this way:</p>
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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">
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Class</span> getNativeIdentifierGeneratorClass() {
<span class="code-keyword" style="color: #000091">if</span> ( getIdentityColumnSupport().supportsIdentityColumns() ) {
<span class="code-keyword" style="color: #000091">return</span> IdentityGenerator.class;
}
<span class="code-keyword" style="color: #000091">else</span> {
<span class="code-comment" style="color: #808080">//From hibernate-core 5.0.6.Final, org.hibernate.dialect.Dialect
</span> <span class="code-comment" style="color: #808080">//the original <span class="code-keyword" style="color: #000091; color: #808080">return</span> value was org.hibernate.id.enhanced.SequenceStyleGenerator.class
</span> <span class="code-keyword" style="color: #000091">return</span> SequenceGenerator.class;
}
}
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