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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-dc22b843-f849-4e90-b495-fc4f1a3a99d3" 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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<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"> <span class="diffcontext">I have updated the hiberate version from 4.0.1.Final to 5.0.7.Final</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">.</span> <span class="diffaddedchars" style="background-color:#ddfade;"> (porting from Jboss 7 to Wildfly 10)</span> <span class="diffcontext"><br><br>*Problem:*<br>The hibernate framwork uses hibernate_sequence for the id generation instead of mySequence.<br><br>*Hibernate configuration:*<br>In order to maintain the backward compatibility, hibernate.id.new_generator_mappings is configured as false value.<br><br>*Entity configuration:*<br>The id field is annotated with the following JPA API:<br><br>{code:java}<br> @Id<br> @GeneratedValue(strategy = GenerationType.AUTO, generator = "myGenerator")<br> @SequenceGenerator(name = "myGenerator", sequenceName = "MY_GENERATOR_SEQ")<br> @Column(name="ID")<br> private Long id;<br>{code}<br><br><br>*DB configuration:*<br>The MY_GENERATOR_SEQ sequence is defined with the "INCREMENT BY 1" option.<br><br>The problem occurs for both H2 and Oracle DB.<br><br>{quote}*QUESTION:*<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???{quote}<br><br><br>*Analysis:*<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".<br><br>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)<br><br>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:<br> <br>{code:java}<br>@Override<br> public Class getNativeIdentifierGeneratorClass() {<br> if ( getIdentityColumnSupport().supportsIdentityColumns() ) {<br> return IdentityGenerator.class;<br> }<br> else {<br> //From hibernate-core 5.0.</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">6</span> <span class="diffaddedchars" style="background-color:#ddfade;">7</span> <span class="diffcontext">.Final, org.hibernate.dialect.Dialect<br> //the original return value was org.hibernate.id.enhanced.SequenceStyleGenerator.class<br> return SequenceGenerator.class; <br> }<br> }<br>{code}</span> </td>
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