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dwso
 Post subject: persist() throwing PropertyAccessException
PostPosted: Wed Jun 13, 2012 2:47 pm 
Newbie

Joined: Wed Jun 13, 2012 2:43 pm
Posts: 1
I'm struggling with a simple hibernate application. (JBoss AS 7.1.1, Hibernate 4.0.1, MySQL 5.5)

My entity bean:

Code:
    @Entity
    public class User implements Serializable {

        @Id
       private Long userId;
   
       public Long getUserId() {
      return userId;
       }

       public void setUserId(Long userId) {
          this.userId = userId;
       }
    }



My persistence.xml:

Code:
    <persistence 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"
   version="2.0">
   <persistence-unit name="users" transaction-type="JTA">
      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <jta-data-source>java:jboss/datasources/myDS</jta-data-source>
      <jar-file>users.jar</jar-file>
      <class>de.test.users.entities.User</class>
      <properties>
         <property name="hibernate.hbm2ddl.auto" value="update" />
         <property name="hibernate.archive.autodetection" value="class" />
         <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
         <property name="hibernate.show_sql" value="true" />
      </properties>
   </persistence-unit>
</persistence>


My simple DAO bean:
Code:
    @Stateless
    public class UserManagerBean implements UserManager {

       @PersistenceContext(name = "users")
       private EntityManager em;

       public UserManagerBean() {
          // TODO Auto-generated constructor stub
       }

       @Override
       public void createUser() {
          User user = new User();
                user.setUserId(42L);
      em.persist(user);
      em.flush();
       }
    }


I'm invoking the createUser method by an EJB injection of UserManagerBean in a JSF backing bean. When the persist method is called, i get the following:


Code:
    javax.faces.el.EvaluationException: javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of de.test.users.entities.User.userId
   at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
   at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
   at javax.faces.component.UICommand.broadcast(UICommand.java:315)
   at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
   at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
   at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
   at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
   at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
   at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
   at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
   at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50)
   at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
   at java.lang.Thread.run(Thread.java:722)
    Caused by: javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of de.test.users.entities.User.userId
   at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:166)
   at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:230)
   at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:304)
   at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:190)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:32)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
   at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:165)
   at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:173)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
   at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:72)
   at de.test.users.service.UserManager$$$view1.createUser(Unknown Source)
   at de.test.users.User.createUser(User.java:17)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.apache.el.parser.AstValue.invoke(AstValue.java:262)
   at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
   at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:39)
   at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
   at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
   at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
   ... 25 more
    Caused by: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of de.test.users.entities.User.userId
   at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1361)
   at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289)
   at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295)
   at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:859)
   at org.jboss.as.jpa.container.AbstractEntityManager.persist(AbstractEntityManager.java:563)
   at de.test.users.service.UserManagerBean.createUser(UserManagerBean.java:31)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374)
   at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:127)
   at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:135)
   at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
   at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:82)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
   at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)
   at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
   at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:228)
   ... 56 more
     Caused by: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of de.test.users.entities.User.userId
   at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:61)
   at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:341)
   at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4260)
   at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3982)
   at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:209)
   at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:509)
   at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:118)
   at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
   at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:725)
   at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:701)
   at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:705)
   at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:853)
   ... 84 more
     Caused by: java.lang.IllegalArgumentException: Can not set java.lang.Long field de.test.users.entities.User.userId to de.test.users.entities.User
   at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)
   at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)
   at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55)
   at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)
   at java.lang.reflect.Field.get(Field.java:372)
   at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:58)
   ... 95 more


Any idea how I could resolve this?
BTW, it seems that hibernate is not able to detect the classes in the jar file automatically. When i remove the class element from persistence.xml, the log tells me that hibernate didn't load any entities for the "users" persistence unit.
Might that have something to do with the exception?

My project structure looks more or less like that:

Code:
    project-ear
    |-- lib
    |-- META-INF
    |   |
    |   |-- maven
    |   |-- persistence.xml
    |   |-- application.xml
    |
    |-- users.jar
    |
    |-- users.war
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