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jboss7 quickstarts entitymanager injection question
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created by <a href="http://community.jboss.org/people/robertwalker">robert walker</a> in <i>JBoss AS7 Development</i> - <a href="http://community.jboss.org/message/635427#635427">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi all, I am looking at the examples in jboss7 quickstarts , login and kithensink (ones that hit a DB)</p><p>and wondering how jb7 knows which persistence unit to inject.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>for example</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><p>if standalone.xml defines a few datasources  (like the default)</p></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>.....</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> and say another named  "MyDataDSource"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>....</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>how does jboss know which one to inject when executing code like this from login quickstart's   ManagedBeanUserManager.java file</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Inject</p><p>private EntityManager userDatabase;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>No designation which PU to to inject,  I was thinking there would have to be code along the idea of the snippet below</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><code class="java color1">@PersistenceContext</code><code class="java plain">(unitName = </code><code class="java string">"MyDataDSource"</code><code class="java plain">)</code></p><p><code class="java plain"></code><code class="java plain">EntityManager em;</code></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I did read the "<a class="jive-link-anchor-small">Chapter 5. CDI + JPA + EJB + JTA + JSF: Login quickstart</a>" but was eagerly wanting to know how jboss knows which </p><p>one to inject but didn't see it, which means it's so obvious that it does not need to be stated. So I realize i should know it this</p><p>but I don''t. :-(</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I see the the pattern suggested by CDI is resource producers, but </p><p><span class="java_type">Resources.java has </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"><span class="java_type"></span> </p><p><span class="java_operator">   //</span><span class="java_plain"> </span><span class="java_type">Expose</span><span class="java_plain"> an entity manager using the resource producer pattern</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span class="java_plain">   @</span><span class="java_type">SuppressWarnings</span><span class="java_separator">(</span><span class="java_literal">"unused"</span><span class="java_separator">)</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span class="java_plain">   @</span><span class="java_type">PersistenceContext</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span class="java_plain">   @</span><span class="java_type">Produces</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span class="java_keyword">   private</span><span class="java_plain"> </span><span class="java_type">EntityManager</span><span class="java_plain"> em</span><span class="java_separator">;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>with no designation either</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>can someone point me to a reesource to explain this a bit more</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>thanks</p></div>
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