How to inject @PersistenceContext into pojo class

cdicode-injectionjava-ee-6

I'm trying to inject PersistenceContex into POJO using @PersistenceContex annotation, I've read that i need to made that POJO managed to do that. So I inject my POJO class into servlet(so its now managed as dependent object, am i right ?) but when servlet is trying to call metod from injected object i get error:

java.lang.IllegalStateException:
Unable to retrieve
EntityManagerFactory for unitName null

So it looks like PersistenceContext is not injected into POJO properly, what should I do to make it work ?

My POJO class looks like this:

public class FileEntityControlerImpl implements FileEntityInterface {

@PersistenceContext
EntityManager entityManager;

@Override
public void createFile(FileEntity fileEntity) {
    ...}

@Override
public FileEntity retriveFile(String fileName) {
    ...}

Injection point:

@Inject
FileEntityInterface fileController;

If I use SLSB and inject using @EJB it works fine.

..::UPDATE::..

stacktrace:

WARNING: StandardWrapperValve[ResourcesServlet]: PWC1406: Servlet.service() for servlet ResourcesServlet threw exception
java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName MambaPU
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:121)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:162)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createNamedQuery(EntityManagerWrapper.java:554)
at pl.zawi.mamba.core.integration.controllers.implementation.FileEntityControlerImpl.retriveFile(FileEntityControlerImpl.java:32)
at pl.zawi.mamba.core.face.servlets.ResourcesServlet.doGet(ResourcesServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:662)

persistance.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
    <persistence-unit name="MambaPU" transaction-type="JTA">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <jta-data-source>jdbc/MambaDB</jta-data-source>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <shared-cache-mode>ALL</shared-cache-mode>
        <properties>
<!--            <property name="javax.persistence.jdbc.password" value="root"/>-->
<!--            <property name="javax.persistence.jdbc.user" value="root"/>-->
<!--            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>-->
<!--            <property name="eclipselink.ddl-generation" value="create-tables"/>-->
<!--            <property name="eclipselink.logging.logger" value="org.eclipse.persistence.logging.DefaultSessionLog"/>-->
            <property name="eclipselink.logging.level" value="ALL"/>
            <property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
        </properties>
    </persistence-unit>
</persistence>

..::UPDATE2::..

If someone is interested there is sorce of my project, I've been using maven so it should be simple to build and run.(MySql drive is not included in pom-s so keep it in mind )

Mamba.Core

Best Answer

Just for the reference:

You don't use the @PersistenceContext annotation at all on Entity classes. Simply including a Persistence Unit with the POJOs will make them managed (adding a persistence.xml and an empty beans.xml into the META-INF folder of the JAR of the POJO classes.

@PersistenceContext is used on Session Beans and its purpose is to automatically inject the EntityManager into the session bean.

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