Hello,
We've been having a strange problem ever since we upgraded to
NHibernate 2.0.0 (I upgraded yesterday to 2.0.1 but the problem still
persists). The problem is: sometimes, and I really mean sometimes, we
have an exception like this one:
--
a different object with the same identifier value was already
associated with the session: 34, of entity:
OrionsBelt.DataAccessLayer.SpecializedExceptionInfo
--
Note that this only occurs when we throw an exception. After throwing,
we try to store it on the DB creating a SpecialziedExceptionInfo to
store the exception and using NHibernate to persist it.
Now, this exception only happens sometimes... we can stay all day long
without it. When we start to have it, it usually happens for sometime,
but if we the restart the process everything works fine again.
More information about the problem pipeline:
» We are on an ASP.NET environment
» We open an NHibernate connection (if needed) on every request, and
we dispose of it at the end of the request. All interaction with the
DB on a given request is made using that connection
» If there's some exception we throw it, catch it, store it to a
SpecializedExceptionInfo and persist it to the DB using NH
» If there's *another* exception, or sometimes another actions, we may
get the problem I'm presenting
More:
» We may have several processes interacting with the DB at the same
time (web and a batch process)
» We use native id generator
» We don't override Equals or GetHashCode
Can anyone help us?
Thank you!
PS: Stack trace and mapping file below.
Here's the full stack trace:
[NonUniqueObjectException: a different object with the same identifier
value was already associated with the session: 0, of entity:
OrionsBelt.DataAccessLayer.SpecializedExceptionInfo]
NHibernate.Engine.StatefulPersistenceContext.CheckUniqueness(EntityKey
key, Object obj) +170
NHibernate.Event.Default.AbstractSaveEventListener.PerformSaveOrReplicate(Object
entity, EntityKey key, IEntityPersister persister, Boolean
useIdentityColumn, Object anything, IEventSource source, Boolean
requiresImmediateIdAccess) +630
NHibernate.Event.Default.AbstractSaveEventListener.PerformSave(Object
entity, Object id, IEntityPersister persister, Boolean
useIdentityColumn, Object anything, IEventSource source, Boolean
requiresImmediateIdAccess) +452
NHibernate.Event.Default.AbstractSaveEventListener.SaveWithGeneratedId(Object
entity, String entityName, Object anything, IEventSource source,
Boolean requiresImmediateIdAccess) +144
NHibernate.Event.Default.DefaultSaveEventListener.SaveWithGeneratedOrRequestedId(SaveOrUpdateEvent
event) +42
NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.EntityIsTransient(SaveOrUpdateEvent
event) +128
NHibernate.Event.Default.DefaultSaveEventListener.PerformSaveOrUpdate(SaveOrUpdateEvent
event) +85
NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate(SaveOrUpdateEvent
event) +199
NHibernate.Impl.SessionImpl.FireSave(SaveOrUpdateEvent event) +45
NHibernate.Impl.SessionImpl.Save(Object obj) +44
OrionsBelt.DataAccessLayer.NHibernatePersistance`1.Update(T t) in I:
\psantos\Sirius\Trunk\DataAccessLayer\NHibernate\Persistance.cs:368
OrionsBelt.DataAccessLayer.ExceptionLogger.Log(Exception ex) in I:
\psantos\Sirius\Trunk\DataAccessLayer\Exceptions\ExceptionLogger.cs:
26
OrionsBelt.WebComponents.LanguageResources.Get(String key) in I:
\psantos\Sirius\Trunk\WebComponents\Localization\LanguageResources.cs:
60
OrionsBelt.WebComponents.LanguageManager.Get(String language,
String key) in I:\psantos\Sirius\Trunk\WebComponents\Localization
\LanguageManager.cs:175
OrionsBelt.WebComponents.LanguageManager.Get(String key) in I:
\psantos\Sirius\Trunk\WebComponents\Localization\LanguageManager.cs:
163
OrionsBelt.WebUserInterface.Engine.WebUtilities.Compare(IResourceInfo
r1, IResourceInfo r2) in I:\psantos\Sirius\Trunk\WebUserInterface
\Engine\WebUtilities.cs:79
Here's the mapping:
<class name="OrionsBelt.DataAccessLayer.SpecializedExceptionInfo,
OrionsBelt.DataAccessLayer"
table="ExceptionInfo"
discriminator-value="-1039632119">
<id name="Id" type="Int32" column="ExceptionInfoID">
<generator class="native" />
</id>
<property name="Name" column="Name" type="String"
length="15000" />
<property name="Message" column="Message" type="String"
length="15000" />
<property name="Date" column="Date" type="DateTime" />
<many-to-one name="PrincipalNHibernate" column="PrincipalID" not-
null="false" />
<property name="Url" column="Url" type="String" length="15000" /
>
<property name="StackTrace" column="StackTrace" type="String"
length="15000" />
<property name="CreatedDate" column="CreatedDate"
type="DateTime" />
<property name="UpdatedDate" column="UpdatedDate"
type="DateTime" />
<property name="LastActionUserId" column="LastActionUserId"
type="Int32" />
</class>
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