I've been wading through a lot of docs in this forum to figure out an exception I'm getting while trying to integrate Hibernate into my J2EE application that I'm deploying to jboss 4.2. I've got a simple pojo named Job, from which xdoclet creates the mapping document below. I create an ear file, which contains a war, and a har. It deploys fine. In my DAO code below, when I try and cast the Object to a Job, I get a ClassCastException. Even if I return it as an Object from the DAO, it just prolongs the exception, since it's raised when I cast it in the service class that calls the DAO.

I've made sure my mappings are correct. I thought this might be due to having the Job.class in my war *and* my har, but I can't seem to deploy the har with just the .hbm.xml files.

Any ideas about why this exception is being thrown?

Hibernate version: 3.2

Mapping documents:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class table="super_job" name="com.na.model.Job">
<id name="id">
<generator class="native"/>
</id>
<property name="jobType" column="job_type"/>
<property name="createdTS" column="created_ts"/>
<property name="updatedTS" column="updated_ts"/>
<property name="completedTS" column="completed_ts"/>
<property name="name" column="name"/>
<property name="description" column="description"/>
<property name="projectId" column="project_id"/>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():

Session hsession = HibernateUtil.getSession();
Job aJob = (Job)hsession.get(Job.class, id); // ***ClassCastException here***
hsession.close();
return aJob;

Full stack trace of any exception that occurs:

18:28:45,935 ERROR [SOAPFaultHelperJAXWS] SOAP request exception
java.lang.ClassCastException: com.na.model.Job
at com.na.dao.HibernateDAO.getJob(HibernateDAO.java:40)
at com.na.SuperJob.getJob(PoyJob.java:59)
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.wsf.container.jboss42.DefaultInvocationHandler.invoke(DefaultInvocationHandler.java:102)
at org.jboss.ws.core.server.ServiceEndpointInvoker.invoke(ServiceEndpointInvoker.java:220)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.processRequest(RequestHandlerImpl.java:408)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:272)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:189)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:122)
at org.jboss.wsf.stack.jbws.EndpointServlet.service(EndpointServlet.java:84)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:595)


Name and version of the database you are using:

MySQL 5.0.51-2

Come to think of it, this probably should have been posted to the jboss forums. Mea culpa.

In any event, I fixed this problem. It was a class loader issue. I took the duplicate .class files out of the war, instead of the har. This doesn't seem very intuitive, but I guess as long as they're being loaded into the JVM then who cares where they come from.