ClassCastException with @DataModel

[texan]

I'm getting the following exception while using @DataModel with a h:dataTable component.

Note that without the "@Out" annotations, my dataTables were always empty. Maybe that in itself is a clue, but I don't know how to debug it further.

Also note that "document" is not null in my test case.

Is there a problem with more than one @DataModel in a bean?

Caused by: java.lang.ClassCastException: java.util.ArrayList
 at org.jboss.seam.databinding.DataModelBinder.isDirty(DataModelBinder.java:19)
 at org.jboss.seam.Component.outjectDataModelList(Component.java:973)
 at org.jboss.seam.Component.outjectDataModels(Component.java:937)
 at org.jboss.seam.Component.outject(Component.java:857)
 at org.jboss.seam.interceptors.BijectionInterceptor.bijectTargetComponent(BijectionInterceptor.java:41)
 at sun.reflect.GeneratedMethodAccessor650.invoke(Unknown Source)
 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.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
 at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
 at org.jboss.seam.interceptors.ConversationInterceptor.endOrBeginLongRunningConversation(ConversationInterceptor.java:82)
 at sun.reflect.GeneratedMethodAccessor649.invoke(Unknown Source)
 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.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
 at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
 at org.jboss.seam.interceptors.BusinessProcessInterceptor.manageBusinessProcessContext(BusinessProcessInterceptor.java:60)
 at sun.reflect.GeneratedMethodAccessor648.invoke(Unknown Source)
 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.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
 at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
 at org.jboss.seam.interceptors.RemoveInterceptor.removeIfNecessary(RemoveInterceptor.java:39)
 at sun.reflect.GeneratedMethodAccessor647.invoke(Unknown Source)
 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.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
 at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
 at org.jboss.seam.ejb.SeamInterceptor.aroundInvokeInContexts(SeamInterceptor.java:73)
 at org.jboss.seam.ejb.SeamInterceptor.aroundInvoke(SeamInterceptor.java:45)
 at sun.reflect.GeneratedMethodAccessor675.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
 at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
 ... 48 more

My Session Bean is:

@Name("viewDocument")
@Stateless
public class ViewDocumentAction implements ViewDocument {

 @DataModel(value = "alerts")
 @Out
 private List alerts;

 @DataModelSelection(value="alerts")
 private Alert selectedAlert;

 @DataModel(value = "docevents")
 @Out
 private List docevents;

 @DataModelSelection(value="docevents")
 private DocumentEvent selectedEvent;

 @Out
 private Document document;

 @PersistenceContext
 private EntityManager em;

 @RequestParameter
 private String documentId;

 public String view() {

 long id = StringUtility.parseLong(documentId);

 document = em.find(Document.class, id);

 if (document != null) {
 // fetch alerts and events from db
 document.getEvents().size();
 document.getAlerts().size();

 alerts = new ArrayList(document.getAlerts());
 docevents = new ArrayList(document.getEvents());
 }

 return "/Document.xhtml";
 }

[anarinsky]

I have the same problem. Did you find a solution?
Thanks!

[tony.herstell1]

This might have helped... (scope page)

 // Used to diaply the final choices in the menu section
 @DataModel(value="finalKeywordsDatamodel", scope=ScopeType.PAGE)
 private LinkedHashSet<Keyword> finalKeywordsSet;

 // Used to diaply the final choices in the menu section
 @DataModel(value="finalCategoriesDatamodel", scope=ScopeType.PAGE)
 private LinkedHashSet<Category> finalCategoriesSet;

But what really got me out of the poo was NOT using @DataModelSelection!


Use EL instead and pass in the selected item (if you can) as a parameter as I have shown below (action="#{keywordsStepController.deleteKeyword(eachKeyword)}"):

 @DataModel(value="keywordsDatamodel", scope=ScopeType.PAGE)
 private LinkedHashSet<Keyword> keywordsSet;

<h:dataTable var="eachKeyword" value="#{keywordsDatamodel}" rendered="#{keywordsDatamodel.rowCount>0}">

 <h:column>
 <f:facet name="header">
 <h:outputText value="#{messages.keyword}" />
 </f:facet>
 <h:outputText value="#{eachKeyword.keyword}" />
 </h:column>

 <h:column>
 <h:commandButton value="#{messages.button_delete}"
 action="#{keywordsStepController.deleteKeyword(eachKeyword)}"/>
 </h:column>
</h:dataTable>

I didnt put this in Jira.. but I could not get DataModelSelection to work for me!

[khatchad]

Hi. I tried not using the DataModelSelection as you have mentioned, however, I am getting a peculiar error:

PWC6296: The function delete must be used with a prefix when a default namespace is not specified

Any ideas?

[khatchad]

You can send params through EL? I didn't think that was possible with JSF. Am I mistaken?

[pmuir]

You can with the extended EL Seam provides (JBoss EL)

[nhieb]

Get rid of the @Out and put @Factory annotations to the method, that fills this lists. I imagine it is view

@Name("viewDocument")
@Stateless
public class ViewDocumentAction implements ViewDocument {

 @DataModel(value = "alerts")
 private List alerts;

 @DataModelSelection(value="alerts")
 private Alert selectedAlert;

 @DataModel(value = "docevents")
 private List docevents;

 @DataModelSelection(value="docevents")
 private DocumentEvent selectedEvent;

 @Out
 private Document document;

 @PersistenceContext
 private EntityManager em;

 @RequestParameter
 private String documentId;

 @Factory("alerts"")
 @Factory("docevents")
 public void view() {

 long id = StringUtility.parseLong(documentId);

 document = em.find(Document.class, id);

 if (document != null) {
 // fetch alerts and events from db
 document.getEvents().size();
 document.getAlerts().size();

 alerts = new ArrayList(document.getAlerts());
 docevents = new ArrayList(document.getEvents());
 }

 }

once xhtml page sees need of alerts to be initiated, it will search for it factory method.