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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-9381" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-01b696b0-1712-4827-a1e9-521568d48780" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9381" style="color: #3b73af; text-decoration: none">HHH-9381</a>
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Issue Type:
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Affects Versions:
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4.3.6
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Assignee:
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Unassigned
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Components:
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annotations
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Created:
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07/Sep/2014 04:32 AM
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Environment:
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Windows 8.1 x64, Oracle 11g XE, Hibernate 4.3.6.Final
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Priority:
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Reporter:
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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="LukeWoodward" id="email_LukeWoodward" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=LukeWoodward" style="color:#6c797f;; color: #3b73af; text-decoration: none">Luke Woodward</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The following annotated entity classes cause a NullPointerException to be thrown when creating an EntityManagerFactory:</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">package</span> com.example;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.*;
<span class="code-keyword" style="color: #000091">import</span> java.util.Set;
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"A"</span>)
<span class="code-keyword" style="color: #000091">public</span> class A {
@Id
@GeneratedValue
<span class="code-comment" style="color: #808080">// @Column(name = <span class="code-quote" style="color: #009100; color: #808080">"aid"</span>)
</span><span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">private</span> <span class="code-object" style="color: #910091; color: #808080">int</span> aid;
</span><span class="code-comment" style="color: #808080">//
</span> @OneToMany
@JoinColumn(name = <span class="code-quote" style="color: #009100">"aid"</span>)
<span class="code-keyword" style="color: #000091">private</span> Set<B> bs;
}
</pre>
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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">package</span> com.example;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.*;
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"B"</span>)
<span class="code-keyword" style="color: #000091">public</span> class B {
@Id
@GeneratedValue
@Column(name = <span class="code-quote" style="color: #009100">"bid"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> bid;
@ManyToOne
@JoinColumn(name = <span class="code-quote" style="color: #009100">"aid"</span>)
<span class="code-keyword" style="color: #000091">private</span> A a;
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The JPA persistence unit is defined as follows:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<b>META-INF/persistence.xml</b>
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<pre class="code-xml" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-tag" style="color: #000091"><?xml version=<span class="code-quote" style="color: #009100">"1.0"</span>?></span>
<persistence xmlns=<span class="code-quote" style="color: #009100">"http://java.sun.com/xml/ns/persistence"</span>
<span class="code-keyword" style="color: #000091; font-weight: bold">xmlns:xsi</span>=<span class="code-quote" style="color: #009100">"http://www.w3.org/2001/XMLSchema-instance"</span>
xsi:schemaLocation=<span class="code-quote" style="color: #009100">"http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"</span>
version=<span class="code-quote" style="color: #009100">"2.0"</span>>
<span class="code-tag" style="color: #000091"><persistence-unit name=<span class="code-quote" style="color: #009100">"example"</span>></span>
<span class="code-tag" style="color: #000091"><class></span>com.example.A<span class="code-tag" style="color: #000091"></class></span>
<span class="code-tag" style="color: #000091"><class></span>com.example.B<span class="code-tag" style="color: #000091"></class></span>
<span class="code-tag" style="color: #000091"><properties></span>
<span class="code-tag" style="color: #000091"><property name=<span class="code-quote" style="color: #009100">"hibernate.dialect"</span> value=<span class="code-quote" style="color: #009100">"org.hibernate.dialect.Oracle10gDialect"</span>/></span>
<span class="code-tag" style="color: #000091"></properties></span>
<span class="code-tag" style="color: #000091"></persistence-unit></span>
<span class="code-tag" style="color: #000091"></persistence></span>
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When I run the following class</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">package</span> com.example;
<span class="code-keyword" style="color: #000091">public</span> class Main {
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void main(<span class="code-object" style="color: #910091">String</span>[] args) {
javax.persistence.Persistence.createEntityManagerFactory(<span class="code-quote" style="color: #009100">"example"</span>);
}
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I get the following stacktrace written to the output:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">Exception in thread "main" javax.persistence.PersistenceException: Unable to build entity manager factory
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:83)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:54)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
at com.example.Main.main(Main.java:5)
Caused by: java.lang.NullPointerException
at org.hibernate.cfg.Ejb3JoinColumn.checkReferencedColumnsType(Ejb3JoinColumn.java:550)
at org.hibernate.cfg.BinderHelper.createSyntheticPropertyReference(BinderHelper.java:258)
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:116)
at org.hibernate.cfg.Configuration.processEndOfQueue(Configuration.java:1596)
at org.hibernate.cfg.Configuration.processFkSecondPassInOrder(Configuration.java:1519)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1420)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:398)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842)
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:75)
... 4 more
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The persistence unit is intentionally missing most of the database configuration. The NPE is reproducible with only the dialect, so I left out the rest of it in order to make the test case minimal. It makes no difference if you do add back the missing configuration, you still get an NPE. So it seems that the NPE is being thrown before Hibernate talks to the database.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In this situation I would much rather there was an exception thrown with a message explaining to me that I'm not using the annotations correctly. The NPE is not remotely helpful and goes no way at all to help a Hibernate novice find and fix their problem. In the above case, the fix is to uncomment the commented-out lines in class A. Once you do that, and restore the missing properties to the persistence unit, the NPE goes away and Hibernate works as expected.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This issue arose from a <a href="http://stackoverflow.com/questions/25698850/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">Stack Overflow question</a>.</p>
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