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Date: Thu, 30 Aug 2012 10:32:01 -0500
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Subject: DelagatingResultList
From: =?ISO-8859-1?Q?Jos=E9_Luis_Cetina?= <maxtorzito@gmail.com>
To: users@openjpa.apache.org
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Hi. I have a problem using myfaces 2.1.8 + openjpa 2.2.0 + primefaces
3.4-SNAPSHOT.

I dont know if asked this in myfaces list or here, anyway, i hope somebody
can help me.

I have 2 SelectOneMenu in a composite component(cc), this cc has a
componentType in a facescomponent class.

The first selectonemenu have a change event in the cc, when this event is
fired the second selectonemenu load data from the database.

In the facescomponent class i use statehelper to save the state of the 2
selectonemenu's, but i have a problem:

This is the scenario:

I have this in my database:

Table country:
id name
1  Spain
2  Mexico
3  USA

Table cities:
id fk name
1  3  New York
2  3  LA

When my page load the country selectonemenu show all the countries without
problem (i retrive them using openjpa),  in the cities selectonemenu's show
nothing because Spain doesnt have cities, well then if i select Mexico my
valuechangelistener method execute and load all the cities, but Mexico
doesnt have nothing in the database then again nothing showed  as expected,
then if a select USA the cities are retrived OK and they are shown in the
cities selectonemenu although if i select another city like Spain i can see
this error (my valuechangelistener never get called again):

java.lang.InstantiationException:
org.apache.openjpa.kernel.DelegatingResultList
java.lang.InstantiationException:
org.apache.openjpa.kernel.DelegatingResultList	at
java.lang.Class.newInstance0(Class.java:357)	at
java.lang.Class.newInstance(Class.java:325)	at
javax.faces.component.UIComponentBase.restoreAttachedState(UIComponentBase.=
java:1842)	at
javax.faces.component._DeltaStateHelper.restoreState(_DeltaStateHelper.java=
:616)	at
javax.faces.component.UIComponentBase.restoreState(UIComponentBase.java:202=
1)	at
org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrategy.res=
toreStateFromMap(DefaultFaceletsStateManagementStrategy.java:661)	at
org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrategy.res=
toreStateFromMap(DefaultFaceletsStateManagementStrategy.java:680)	at
org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrategy.res=
toreStateFromMap(DefaultFaceletsStateManagementStrategy.java:680)	at
org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrategy.res=
toreStateFromMap(DefaultFaceletsStateManagementStrategy.java:680)	at
org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrategy.res=
toreView(DefaultFaceletsStateManagementStrategy.java:330)	at
org.apache.myfaces.application.StateManagerImpl.restoreView(StateManagerImp=
l.java:130)	at
org.apache.myfaces.shared.view.ViewDeclarationLanguageBase.restoreView(View=
DeclarationLanguageBase.java:106)	at
org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.restoreView=
(FaceletViewDeclarationLanguage.java:2109)	at
org.apache.myfaces.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.=
java:300)	at
com.ocpsoft.pretty.faces.application.PrettyViewHandler.restoreView(PrettyVi=
ewHandler.java:109)	at
org.apache.myfaces.extensions.cdi.jsf.impl.scope.conversation.WindowContext=
AwareViewHandler.restoreView(WindowContextAwareViewHandler.java:122)	at
org.apache.myfaces.extensions.cdi.jsf.impl.CodiViewHandler.restoreView(Codi=
ViewHandler.java:99)	at
javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.j=
ava:83)	at
javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.j=
ava:83)	at
org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecuto=
r.java:127)	at
org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:=
170)	at
org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)	=
at
org.apache.myfaces.extensions.cdi.jsf2.impl.listener.phase.CodiLifecycleWra=
pper.execute(CodiLifecycleWrapper.java:95)	at
javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applicatio=
nFilterChain.java:305)	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterC=
hain.java:210)	at
com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:145)	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applicatio=
nFilterChain.java:243)	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterC=
hain.java:210)	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.j=
ava:225)	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.j=
ava:123)	at
org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)	at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBas=
e.java:472)	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:16=
8)	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98=
)	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)	a=
t
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.jav=
a:118)	at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)=
	at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Proc=
essor.java:1001)	at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(Abstra=
ctProtocol.java:579)	at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java=
:312)	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1=
110)	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:=
603)	at
java.lang.Thread.run(Thread.java:722)


I observe this:

If you select countries that doesnt have cities no error is shown
(something like moving from Spain to Mexico and viceversa), but when i
select a country like USA that have cities the cities load ok, but if i try
to select another country like mexico then the valuechangelistener method
never get called again because the exception is thrown.

I get the cities using this method:

public List<City> getCities(Country country) {

     CriteriaBuilder cb =3D em.getCriteriaBuilder();
     CriteriaQuery<City> cq =3D cb.createQuery(City.class);
     Root<City> root =3D cq.from(City.class);
     cq.select(root);
     cq.where(cb.equal(root.get(City_.countryId).get(Country_.countryId),
country.getCountryId()));
     List<City> resultList =3D (List<City>)
em.createQuery(cq).getResultList();
     return resultList;
}

I debug my example and i can see in the saveAttachedState method of
UIComponentBase.java the list of cities is a type of DelagatingResultList
but i dont understand why, if im doing a cast when i use the getResultList
method, why openjpa encapsulate my object in a DelagatingResultList?

Then the  attachedObject from the saveAttachedState method arrives as
DelagatingResultList and then it cant create an instance.

What i did is return a manual arraylist something like this, and the
exception never thrown.

public List<City> getCities(Country country) {
    ArrayList<City> list =3D new ArrayList<City>(2);
    list.add(new City("New York"));
    list.add(new City("LA"));
    return list;
}

Finally i dont know what or which is wrong, openjpa or myfaces, openjpa
return a DelagatingResultList object and myfaces cant create an instance of
that object.
What can i do ?


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*SCJA. Jos=E9 Luis Cetina*
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