Trying to inject an EntityManager into a JSF managed bean fails in JBoss
4.0.4RC1.
My entities are in a JAR, JSF managed beans in a WAR (beans are listed as
managed bean in faces-config.xml and work....apart from an injected
EntityManager always being NULL). Both the JAR and the WAR are bundled in an
EAR which is then deployed.
META-INF/persistence.xml in entities JAR is
<persistence>
| <persistence-unit name="jsEntities">
| <provider>org.hibernate.ejb.HibernatePersistence</provider>
| <jta-data-source>java:/bookingDatasource</jta-data-source>
| <properties>
| <property name="hibernate.dialect"
value="org.hibernate.dialect.MySQLDialect"/>
| <property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
| <property name="hibernate.transaction.flush_before_completion"
value="true"/>
| <property name="hibernate.hbm2ddl.auto" value="update"/>
| <property name="hibernate.show_sql" value="true"/>
| </properties>
| </persistence-unit>
| </persistence>
The JSF managed beans looks like this:
import javax.annotation.Resource;
| import javax.persistence.*;
| import java.util.*;
|
| public class AddressPage {
| @PersistenceContext(unitName="jsEntities")
| private EntityManager em;
|
| @Resource
| private UserTransaction utx;
|
| public Person person = new Person();
|
| public void findPerson() {
| if (em == null) System.out.println(">>>em is null");
| person = em.find(Person.class, person.getGid());
>From a JSF page I use
<h:inputText value="#{AddressPageBean.person.gid}" />
| <h:commandButton value="FindPerson" action="#{AddressPageBean.findPerson}"
/>
which results in an the folllowing error in the log
| 00:48:57,361 INFO [STDOUT] >>>em is null
| 00:48:57,371 ERROR [[Faces Servlet]] Servlet.service() for servlet Faces
Servlet threw exception
| javax.faces.FacesException: Error calling action method of component with
id _id0:_id4
| at
org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
| at javax.faces.component.UICommand.broadcast(UICommand.java:106)
| at
javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
| at
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164)
| at
org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:316)
| at
org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
| at javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
| at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
| at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
| at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
| at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
| at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
| at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
| at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
| at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
| at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
| at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
| at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
| at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
| at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
| at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
| at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
| at java.lang.Thread.run(Unknown Source)
| Caused by: javax.faces.el.EvaluationException: Exception while invoking
expression #{AddressPageBean.findPerson}
| at
org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:153)
| at
org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
| ... 25 more
| Caused by: java.lang.NullPointerException
| at info.agentbob.faces.AddressPage.findPerson(AddressPage.java:28)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
| at java.lang.reflect.Method.invoke(Unknown Source)
| at
org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:129)
| ... 26 more
|
Looks like the persistence context cannot be found and therefore the
EntityManager is NULL, but why ?
The persistence unit names match, therefore according to
http://trailblazer.demo.jboss.com/EJB3Trail/persistence/config/ I don't need a
jboss-app.xml in the EAR as I have specified the persistence unit name.
What am I missing ?
Can I not inject an EntityManager in a JSF managed bean ? Would a bean have to
be a "proper" EJB3 bean rather than a JSF managed bean for the EntityManager
injection to work ?
Thanks for any ideas.
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