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<p style="margin: 10px 0 0 0">I ran in to this exact problem as well. We're using Spring Data Jpa 1.4.2.RELEASE (or 1.5.1.RELEASE) with JPA 2.1 and Hibernate 4.3.5.Final. We upgraded from 4.1.0.Final along with using JPA 2.1 and our base repository.findOne(..) stopped working for repositories tracking entities with inheritance.</p>
<p style="margin: 10px 0 0 0">Our entity setup is:</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">
@MappedSuperclass
<span class="code-keyword" style="color: #000091">public</span> class A {}
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">abstract</span> class User <span class="code-keyword" style="color: #000091">extends</span> A {}
@Entity
<span class="code-keyword" style="color: #000091">public</span> class SimpleUser <span class="code-keyword" style="color: #000091">extends</span> B {}
@Entity
<span class="code-keyword" style="color: #000091">public</span> class ComplexUser <span class="code-keyword" style="color: #000091">extends</span> B {
@NotNull
@ManyToOne
<span class="code-keyword" style="color: #000091">private</span> OtherEntity otherEntity;
}</pre>
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<p style="margin: 10px 0 0 0">With a repository class like so:</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">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> UserRepository <span class="code-keyword" style="color: #000091">extends</span> JpaRepository<User, <span class="code-object" style="color: #910091">Long</span>>, QueryDslPredicateExecutor<User> {
}</pre>
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<p style="margin: 10px 0 0 0">Calling </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">UserRepository.findOne(1L)</pre>
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<p style="margin: 10px 0 0 0"> should look through the SimpleUser and ComplexUser entities but instead always returned null. Tracking through the SQL, there is indeed an INNER JOIN on the OtherEntity table instead of a LEFT OUTER JOIN.</p>
<p style="margin: 10px 0 0 0">After implementing the proposed in <a href="https://hibernate.atlassian.net/browse/HHH-8830?focusedCommentId=57088&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-57088" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://hibernate.atlassian.net/browse/HHH-8830?focusedCommentId=57088&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-57088</a> like the following:</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">
LocalContainerEntityManagerFactoryBean factoryBean = <span class="code-keyword" style="color: #000091">new</span> LocalContainerEntityManagerFactoryBean();
...
Map<<span class="code-object" style="color: #910091">String</span>, <span class="code-object" style="color: #910091">Object</span>> properties = <span class="code-keyword" style="color: #000091">new</span> HashMap<>();
properties.put(<span class="code-quote" style="color: #009100">"hibernate.batch_fetch_style"</span>, <span class="code-quote" style="color: #009100">"PADDED"</span>);
factoryBean.setJpaPropertyMap(properties);
...
</pre>
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<p style="margin: 10px 0 0 0">The SQL correctly uses LEFT JOINs. I would say that this is a pretty big issue that needs resolving!</p>
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