2 Replies Latest reply on Sep 17, 2006 1:46 PM by gavin.king

    setParameter: weird query behaviour

    mgombocz
    mgombocz Sep 16, 2006 7:29 PM

      Hi folks,
      I am using Seam, JBoss AS, Facelets, MyFaces and would like to create application-scoped components (lists with salutations, titles etc.) for filling dropdown lists.
      I am doing that by having a SLSB with a @Factory method that initially fills my outjected variable "salutationItems".
      In the @Factory method I call "createQuery":

      Query query = em.createQuery("SELECT new javax.faces.model.SelectItem(s.value, s.label) FROM StringListItem s WHERE s.listType = 'SALUTATION' ORDER BY s.label");
salutationItems = query.getResultList();

      In this case everything works fine!
      But, as soon as I want to use "setParameter" instead of the hardcoded Select statement...
      Query query = em.createQuery("SELECT new javax.faces.model.SelectItem(s.value, s.label) FROM StringListItem s WHERE s.listType = :lType ORDER BY s.label");
query.setParameter("lType", "SALUTATION");
salutationItems = query.getResultList();

      ...I get the error when I call the JSF page:
      javax.ejb.EJBTransactionRolledbackException: java.lang.ClassCastException: java.lang.String
 at org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:93)
 at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130)
 at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:201)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:181)
 at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:79)
 at $Proxy496.loadSalutations(Unknown Source)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.seam.util.Reflections.invoke(Reflections.java:13)
 at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:32)
 at org.jboss.seam.Component.callComponentMethod(Component.java:1334)
 at org.jboss.seam.Component.getInstanceFromFactory(Component.java:1293)
 at org.jboss.seam.Component.getInstance(Component.java:1260)
...

      I am trying on my own for hours now and give up...
      Could anyone of you please help me?

      Thanks!

      PS. Here's the complete code: 
      @Stateless
@Name("stringLists")
public class StringListManager implements StringListManagerLocal {

 @Logger
 Log log;

 @PersistenceContext
 private EntityManager em;

 @Out(scope = ScopeType.APPLICATION)
 private List<SelectItem> salutationItems;

 @Factory("salutationItems")
 public void loadSalutations() {
 log.info("Start loading salutationItem");

 Query query = em
 .createQuery("SELECT new javax.faces.model.SelectItem(s.value, s.label) FROM StringListItem s WHERE s.listType = :lType ORDER BY s.label");
 query.setParameter("lType", "SALUTATION");

 salutationItems = query.getResultList();

 log.info("End loading salutationItem. Count: "+ salutationItems.size());
 }
}

      Part of the JSF page:
      <h:selectOneMenu id="salut">
 <f:selectItems value="#{salutationItems}" />
 </h:selectOneMenu>


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