java.lang.IllegalArgumentException: argument de l'incompatibilité de type à l'aide de setResultTransformer (hibernate)

Eh bien, je suis en train de jeter ma liste d'objets dans une classe et j'obtiens le message d'erreur ci-dessus (erreur complète détails ci-dessous). J'ai regardé autour et a essayé de suggestions, mais ne peut pas voir quelque chose de mal.
J'ai essayé de mettre un point d'arrêt dans la classe POJO mais il ne fonctionne pas. Je suppose que les points d'arrêt ne fonctionne pas quand il s'agit de web apps.

Le domaine, je suis de la récupération (instance_id) est déclaré comme nombre dans l'Oracle 11GR2 DB.

Pouvez-vous s'il vous plaît aider?

ma requête native (définie dans mon hbm fichier et je l'ai essayé avec et sans retour-scalaire)

<sql-query name="getEventSessionsForFab1">
    <return-scalar column="instanceId" type="long" />

    <![CDATA[select eventInstance.instance_id as "instanceId" from events event, event_instances eventInstance where event.event_id = eventInstance.event_id and eventInstance.start_date_time > sysdate and (eventInstance.register_cutoff_date >= sysdate or eventInstance.register_cutoff_date is null) and (lower(event.event_name) like :eventName or event.event_id = 1)]]>
</sql-query>

mon code java

List<EventSession> eventSessionList1 = sessionFactory.getCurrentSession()
                        .getNamedQuery("getEventSessionsForFab1")
                        .setParameter("eventName", "%" + (lovList.size() > 0 ? lovList.get(0).getCode().toLowerCase() : "general") + "%")
                        .setResultTransformer(Transformers.aliasToBean(EventSession.class))
                        .list();

ma classe java (il y avait plus de champs ici, mais j'ai retenu seulement 1 pour les tests)

package com.myapps.issu.models.database;

public class EventSession {
    private Integer instanceId;

    public Integer getInstanceId() {
        return instanceId;
    }
    public void setInstanceId(Integer instanceId) {
        this.instanceId = instanceId;
    }

}

plein de message d'erreur affiché dans eclipse console

Feb 14, 2013 5:01:06 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [spring] in context with path [/issu] threw exception [Request processing failed; nested exception is org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.myapps.issu.models.database.EventSession.instanceId] with root cause
java.lang.IllegalArgumentException: argument type mismatch
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:597)
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:65)
at org.hibernate.transform.AliasToBeanResultTransformer.transformTuple(AliasToBeanResultTransformer.java:95)
at org.hibernate.hql.internal.HolderInstantiator.instantiate(HolderInstantiator.java:95)
at org.hibernate.loader.custom.CustomLoader.getResultList(CustomLoader.java:395)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2227)
at org.hibernate.loader.Loader.list(Loader.java:2222)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:331)
at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1783)
at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:231)
at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:156)
at com.myapps.issu.dao.IssuDaoImpl.getEventSessionsForFab(IssuDaoImpl.java:122)
at com.myapps.issu.services.IssuServiceImpl.getEventSessionsForFab(IssuServiceImpl.java:125)
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:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy13.getEventSessionsForFab(Unknown Source)
at com.myapps.issu.controllers.IssuController.getEventSessions(IssuController.java:120)
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:597)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)