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POJPA Entity Manager Factory injection fails (JPA 2, Eclipselink, J2EE 6)
 

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  1. POJPA Entity Manager Factory injection fails (JPA 2, Eclipselink, J2EE 6)
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    <p>I am trying to get a small sample web app up and running but I have run into a problem injecting the Entity Manager Factory.</p> <p>My persistence.xml is as follows;</p> <pre><code>&lt;persistence version="2.0" xmlns=" http://java.sun.com/xml/ns/persistene" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence ttp://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"&gt; &lt;persistence-unit name="main" transaction-type="JTA"&gt; &lt;provider&gt;org.eclipse.persistence.jpa.PersistenceProvider&lt;/provider&gt; &lt;jta-data-source&gt;jdbc/Maindb&lt;/jta-data-source&gt; &lt;properties&gt; &lt;property name="eclipselink.ddl-generation" value="drop-and-create-tables" /&gt; &lt;property name="eclipselink.ddl-generation.output-mode" value="database" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; </code></pre> <p></p> <p>The web application has two functions; return a customer and a list of items.</p> <p>The CustomerResource object injects the entity manager factory as follows:</p> <pre><code>@PersistenceUnit(unitName="main") private EntityManagerFactory emf; </code></pre> <p>and queries the persistence layer by the following code;</p> <pre><code>EntityManager em = emf.createEntityManager(); Customer customer = (Customer) em.find(Customer.class, customerID); </code></pre> <p>This works with no problems (that I am aware of), I get the expected data returned.</p> <p>The ItemResource object does the same thing against the same persistence unit.</p> <pre><code>@PersistenceUnit(unitName="main") private EntityManagerFactory emf; </code></pre> <p>But the injection fails and emf is always null.</p> <pre><code>EntityManager em = emf.createEntityManager(); &lt;- emf is null here </code></pre> <p>I am unsure of what I have done wrong here, my guess is that I am using the entity manager factory incorrectly.</p> <p>Any help would be much appreciated! Thanks</p> <p><strong>Update</strong></p> <p>I was taking out the troublesome code to put in a war file for everyone to look at which helped me isolate the problem.</p> <p>The issue seems to be with the url patterns I am using.</p> <p>web.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"&gt; &lt;listener&gt; &lt;listener-class&gt;com.sun.xml.ws.transport.http.servlet.WSServletContextListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;servlet&gt; &lt;servlet-name&gt;Item&lt;/servlet-name&gt; &lt;servlet-class&gt;com.sun.xml.ws.transport.http.servlet.WSServlet&lt;/servlet-class&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Item&lt;/servlet-name&gt; &lt;url-pattern&gt;/Item/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet&gt; &lt;servlet-name&gt;Customer&lt;/servlet-name&gt; &lt;servlet-class&gt;com.sun.xml.ws.transport.http.servlet.WSServlet&lt;/servlet-class&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Customer&lt;/servlet-name&gt; &lt;url-pattern&gt;/Customer&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;/web-app&gt; </code></pre> <p>sun-jaxws.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;endpoints xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime" version="2.0"&gt; &lt;endpoint name="Item" implementation="com.test.item.ItemResource" url-pattern="/Item/*" /&gt; &lt;endpoint name="Customer" implementation="com.test.customer.CustomerResource" url-pattern="/Customer" /&gt; &lt;/endpoints&gt; </code></pre> <p>The item resource right now has two web methods;</p> <ol> <li><p>Get Item Details <br> Type: Get <br> Path: / <br> Web param: item id<br></p></li> <li><p>Get Item List<br> Type: Get<br> Path: /list<br> Web param: Item Colour<br></p></li> </ol> <p>With the wild cards in the url patterns the entity manager is always null. If I remove the wild cards then I can successfully request an item, put I cannot request a list of items because it is not mapped.</p> <p>The customer resource requests are always successful because it does not contain any wild cards in the mappings.</p> <p>Thanks</p>
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    1. USRupesh Yadav
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    1. COIs the ItemResource class an EJB, a servlet or a managed bean?
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      1. USVineet Reynolds
    2. COI *think* that @PersistenceUnit is only guaranteed to work on objects managed by the EJB container. I could be mistaken, though. Are both CustomerResource and ItemResource EJBs of some type? If you're not sure, you could show the class definitions.
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      1. USDan LaRocque
    3. CO@Dan, the annotation works for all container managed objects (both the servlet and EJB container fit this definition). EJBs are one such kind of managed objects.
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      1. USVineet Reynolds
 

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