I'm running JBoss with hibernate and HSQL and I'm having problems with classloading.

I've included all my class files and hibernate configuration files in my war file. When my application initializes it finds the config/mapping files for hibernate just fine but I get ClassNotFound exceptions when it tries to resolve the mapped classes.

2003-10-25 15:58:56,974 INFO [net.sf.hibernate.cfg.Configuration] Configured SessionFactory: /hibernate/sessionFactory
2003-10-25 15:58:56,974 INFO [net.sf.hibernate.cfg.Configuration] Mapping resource: com/stic/database/jdo/Mailbox.hbm.xml
2003-10-25 15:58:57,024 ERROR [net.sf.hibernate.cfg.Configuration] Could not compile the mapping document
java.lang.ClassNotFoundException: com.stic.database.jdo.Mailbox
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at org.jboss.mx.loading.UnifiedClassLoader.findClass(UnifiedClassLoader.java:401)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at org.jboss.mx.loading.UnifiedClassLoader.loadClassLocally(UnifiedClassLoader.java:242)
at org.jboss.mx.loading.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:114)
at org.jboss.mx.loading.LoadMgr.nextTask(LoadMgr.java:281)
at org.jboss.mx.loading.UnifiedClassLoader3.loadClass(UnifiedClassLoader3.java:181)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at net.sf.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:268)
at net.sf.hibernate.cfg.Binder.bindClass(Binder.java:73)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:165)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1095)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:230)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:252)
at net.sf.hibernate.cfg.Configuration.addClass(Configuration.java:286)
at com.stic.database.access.DatabaseIterator.(DatabaseIterator.java:39)
at com.stic.database.access.TradingPartnerIterator.(TradingPartnerIterator.java:27)
at com.stic.database.wrapper.MailboxWrapper.insertMailbox(MailboxWrapper.java:36)
at com.stic.workflow.delegation.impl.action.ArchiveAndCheckSequenceAction.run(ArchiveAndCheckSequenceAction.java:70)
at org.jbpm.workflow.delegation.impl.DelegationHelper.delegateAction(DelegationHelper.java:29)
at org.jbpm.workflow.execution.impl.ExecutionEngineImpl.runActionsForEvent(ExecutionEngineImpl.java:44)
at org.jbpm.workflow.execution.impl.ExecutionEngineImpl.processTransition(ExecutionEngineImpl.java:52)
at org.jbpm.workflow.execution.impl.ExecutionComponentImpl.startProcessInstance(ExecutionComponentImpl.java:74)
at org.jbpm.workflow.execution.ejb.impl.ExecutionSessionBean.startProcessInstance(ExecutionSessionBean.java:59)
at org.jbpm.workflow.execution.ejb.impl.ExecutionSessionBean.startProcessInstance(ExecutionSessionBean.java:46)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:629)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:322)
at org.jboss.ejb.Container.invoke(Container.java:674)
at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353)
at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:83)
at $Proxy66.startProcessInstance(Unknown Source)
at com.stic.process.impl.ProcessInitiator.startNewDocument(ProcessInitiator.java:96)
at com.stic.process.impl.ProcessInitiator.run(ProcessInitiator.java:223)
rethrown as
net.sf.hibernate.MappingException: persistent class not found: com.stic.database.jdo.Mailbox
at net.sf.hibernate.cfg.Binder.bindClass(Binder.java:76)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:165)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1095)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:230)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:252)
at net.sf.hibernate.cfg.Configuration.addClass(Configuration.java:286)
at com.stic.database.access.DatabaseIterator.(DatabaseIterator.java:39)
at com.stic.database.access.TradingPartnerIterator.(TradingPartnerIterator.java:27)
at com.stic.database.wrapper.MailboxWrapper.insertMailbox(MailboxWrapper.java:36)
at com.stic.workflow.delegation.impl.action.ArchiveAndCheckSequenceAction.run(ArchiveAndCheckSequenceAction.java:70)
at org.jbpm.workflow.delegation.impl.DelegationHelper.delegateAction(DelegationHelper.java:29)
at org.jbpm.workflow.execution.impl.ExecutionEngineImpl.runActionsForEvent(ExecutionEngineImpl.java:44)
at org.jbpm.workflow.execution.impl.ExecutionEngineImpl.processTransition(ExecutionEngineImpl.java:52)
at org.jbpm.workflow.execution.impl.ExecutionComponentImpl.startProcessInstance(ExecutionComponentImpl.java:74)
at org.jbpm.workflow.execution.ejb.impl.ExecutionSessionBean.startProcessInstance(ExecutionSessionBean.java:59)
at org.jbpm.workflow.execution.ejb.impl.ExecutionSessionBean.startProcessInstance(ExecutionSessionBean.java:46)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:629)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:322)
at org.jboss.ejb.Container.invoke(Container.java:674)
at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353)
at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:83)
at $Proxy66.startProcessInstance(Unknown Source)
at com.stic.process.impl.ProcessInitiator.startNewDocument(ProcessInitiator.java:96)
at com.stic.process.impl.ProcessInitiator.run(ProcessInitiator.java:223)
2003-10-25 15:58:57,034 ERROR [com.stic.database.access.DatabaseIterator] DatabaseIterator.save threw an exception.

The offending line of code is a call to Configuration.addClass(Mailbox.class).

Everything works fine if I add my project's jar file to my jboss server's lib folder. Is this the only way to resolve this?