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AS7, EJB3, JSF, JPA2: LazyInitializationException
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created by <a href="https://community.jboss.org/people/jabu10245">jabu10245</a> in <i>JBoss AS 7 Development</i> - <a href="https://community.jboss.org/message/648068#648068">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello Forum,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm new to AS7 etc. and I'm trying to create a little EAR project in the Standalone environment.</p><p>Here's my project configuration (using Maven):</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="text-decoration: underline;"><strong>myapp.ear:</strong></span></p><p><ear>/META-INF/application.xml:</p><pre class="jive-pre"><code class="jive-code jive-xml">[...]
<span class="jive-xml-tag"><module></span><span class="jive-xml-tag"><ejb></span>myapp-ejb.jar<span class="jive-xml-tag"></ejb></span><span class="jive-xml-tag"></module></span>
<span class="jive-xml-tag"><module></span><span class="jive-xml-tag"><web></span><span class="jive-xml-tag"><web-uri></span>myapp-jsf.war<span class="jive-xml-tag"></web-uri></span><span class="jive-xml-tag"></web></span><span class="jive-xml-tag"></module></span>
<span class="jive-xml-tag"><library-directory></span>lib<span class="jive-xml-tag"></library-directory></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><ear>/lib/commons-lang.jar</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><ear>/myapp-ejb.jar</p><p><ear>/myapp-jsf.war</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="text-decoration: underline;"><strong>myapp-ejb.jar:</strong></span></p><p><jar>/META-INF/beans.xml => empty beans.xml</p><p><jar>/META-INF/persistence.xml:</p><pre class="jive-pre"><code class="jive-code jive-xml">[...]
<span class="jive-xml-tag"><persistence-unit name="primary"></span>
    <span class="jive-xml-tag"><jta-data-source></span>java:jboss/datasources/ExampleDS<span class="jive-xml-tag"></jta-data-source></span>
    <span class="jive-xml-tag"><properties></span>
        <span class="jive-xml-tag"><property name="hibernate.hbm2ddl.auto" value="create-drop" /></span>
    <span class="jive-xml-tag"></properties></span>
<span class="jive-xml-tag"></persistence-unit></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and an EJB (for testing purpose as singleton):</p><pre class="jive-pre"><code class="jive-code jive-java">@LocalBean
@Named(<font color="red">"fooManager"</font>)
@Singleton @Startup
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> FooManagerBean <font color="navy"><b>implements</b></font> FooManager <font color="navy">{</font>
    <font color="navy"><b>private</b></font> @PersistenceContext EntityManager entityManager;
 
    <font color="navy"><b>public</b></font> Foo getFoo(String name) <font color="navy">{</font> <font color="darkgreen">/* JPA lookup using entityManager */</font> <font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p>The class Foo is just a mapped entity having Foos as children:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Entity @Table(name = <font color="red">"foo"</font>)
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> Foo <font color="navy"><b>implements</b></font> Serializable <font color="navy">{</font>
    @Column(name = <font color="red">"name"</font>, nullable = false, unique = true, length = 64)
    <font color="navy"><b>private</b></font> String name;
 
    @ManyToOne
    <font color="navy"><b>private</b></font> Foo parent;  <font color="darkgreen">// nullable</font>
 
    @OneToMany(mappedBy = <font color="red">"parent"</font>)
    <font color="navy"><b>private</b></font> List<Foo> children;
 
    <font color="darkgreen">// Getters and Setters, hashCode, equals, toString</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong style="text-decoration: underline;">myapp-jsf.war:</strong></p><p><war>/WEB-INF/beans.xml => empty beans.xml</p><p><war>/WEB-INF/faces-config.xml => empty JSF 2.0 config xml</p><p><war>foo.xhtml => displays all root foos with all their children => <span style="color: #ff0000;"><em><strong>LazyInitializationException</strong></em></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Named @RequestScoped
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> FooController <font color="navy"><b>implements</b></font> Serializable <font color="navy">{</font>
[...]
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #000000;">The FooController uses the </span><pre class="jive-pre"><code class="jive-code jive-java">@EJB FooManager
</code></pre><span style="color: #000000;"> to load all root Foo objects, the foo.xhtml should display them with</span></p><p><span style="color: #000000;">all their children. The root Foo objects are being loaded correctly, but when I try to access the</span></p><p><span style="color: #000000;">children a LazyInitializationException is being thrown, because I access them outside the transaction</span></p><p><span style="color: #000000;">scope of the Entity Manager from the FooManager.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #000000;">My question is: Is there something like Spring's OpenEntityManagerInViewInterceptor?</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #000000;">I googled it and found some descriptions using Seam, but I have no experience with that. Is Seam</span></p><p><span style="color: #000000;">party of JBoss AS7? Or do I have to include it in my WAR as a dependency? What version should I</span></p><p><span style="color: #000000;">use? Or is there any simpler way solving my problem?</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #000000;">Thanks to anyone who can point me to a solution ;-)<br/></span></p></div>
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