Using .NET 1.1, AndroMDA with nHibernate

This exception occurs randomly on production and everything works fine on reloading the page. We have not encountered this exception while development.

I have checked all hbm mapping files are embedded resource. we have caching enabled and settings as given below:

Caching Entries
<!-- NHibernate caching settings-->
<property name="hibernateEnableCache">true</property>
<property name="hibernateEnableAssociationsCache">false</property>
<property mame="hibernateQueryUseNamedParameters">true</property>
<property name="ehCacheEternal">false</property>
<property name="ehCacheMaxElementsInMemory">100</property>
<property name="ehCacheOverflowToDisk">false</property>
<property name="ehCacheTimeToIdleSeconds">0</property>
<property name="ehCacheTimeToLiveSeconds">172800</property>
<property name="hibernateAssociationCache">read-write</property>
<property name="hibernateEntityCache">read-write</property>
<property name="hibernateUseQueryCache">false</property>


Full stack trace of any exception that occurs:

2007-04-10 16:02:06,984 [5032] ERROR [(null)] -

Exception Details:
System.Web.HttpUnhandledException: Exception of type System.Web.HttpUnhandledException was thrown. ---> NHibernate.
MappingException: Association references unmapped class: StoryImpl
at NHibernate.Cfg.Binder.BindCollectionSecondPass(XmlNode node, Collection model, IDictionary persistentClasses,
Mappings mappings)
at NHibernate.Cfg.SetSecondPass.SecondPass(IDictionary persistentClasses)
at NHibernate.Cfg.AbstractSecondPass.DoSecondPass(IDictionary persistentClasses)
at NHibernate.Cfg.Configuration.SecondPassCompile()
at NHibernate.Cfg.Configuration.BuildSessionFactory()
at AndroMDA.NHibernateSupport.DefaultSessionManager.BuildSessionFactory()
at AndroMDA.NHibernateSupport.DefaultSessionManager.HandleSessionStart()
at Services.ProjectServiceBase.GetProjectByRsProjectID(String rsProjectID)
at Web.Layout.ToolsLayout.get_ProjectVO()
at Web.Home.HandleLogin()
at Web.Home.Page_Load(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain()
--- End of inner exception stack trace ---
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain()
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

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2007-04-09 09:31:27,031 [1900] ERROR [(null)] -

Exception Details:
System.Web.HttpUnhandledException: Exception of type System.Web.HttpUnhandledException was thrown. --->
Services.ProjectServiceException: undefined alias or unknown mapping: PT [from PT.Domain.ProjectImpl as
project where project.RsProjectId = :RsProjectId] ---> NHibernate.QueryException: undefined alias or unknown mapping:
PT [from PT.Domain.ProjectImpl as project where project.RsProjectId = :RsProjectId]
at NHibernate.Hql.PathExpressionParser.Token(String token, QueryTranslator q)
at NHibernate.Hql.ParserHelper.Parse(IParser p, String text, String seperators, QueryTranslator q)
at NHibernate.Hql.FromParser.Token(String token, QueryTranslator q)
at NHibernate.Hql.ClauseParser.Token(String token, QueryTranslator q)
at NHibernate.Hql.PreprocessingParser.Token(String token, QueryTranslator q)
at NHibernate.Hql.ParserHelper.Parse(IParser p, String text, String seperators, QueryTranslator q)
at NHibernate.Hql.QueryTranslator.Compile()
at NHibernate.Hql.QueryTranslator.Compile(ISessionFactoryImplementor factory, IDictionary replacements, Boolean
scalar)
at NHibernate.Impl.SessionFactoryImpl.GetQuery(String queryString, Boolean shallow)
at NHibernate.Impl.SessionImpl.GetQueries(String query, Boolean scalar)
at NHibernate.Impl.SessionImpl.Find(String query, QueryParameters parameters)
at NHibernate.Impl.QueryImpl.List()
at PT.Domain.ProjectDaoBase.GetProjectByRsProjectID(Int32 transform, String queryString, String RsProjectId)
at PT.Domain.ProjectDaoBase.GetProjectByRsProjectID(Int32 transform, String RsProjectId)
at PT.Services.ProjectServiceImpl.HandleGetProjectByRsProjectID(String rsProjectID)
at PT.Services.ProjectServiceBase.GetProjectByRsProjectID(String rsProjectID)
--- End of inner exception stack trace ---
at PT.Services.ProjectServiceBase.GetProjectByRsProjectID(String rsProjectID)
at PT.Web.Layout.ToolsLayout.get_ProjectVO()
at PT.Web.Home.HandleLogin()
at PT.Web.Home.Page_Load(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain()
--- End of inner exception stack trace ---
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain()
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

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Read this: http://hibernate.org/42.html