Hello,
A change has been to made HashtableCache in RC2.

in RC1 :
public object Get( object key )
{
return hashtable[ key.ToString() ];
}
in RC2
public object Get( object key )
{
return hashtable[ key ];
}

if key is a CacheKey then the ToString() method was (in RC1) based on
CacheKey.entityOrRoleName + CacheKey.Key.ToString() to build the ID for the cache.

(CacheKey)
public override string ToString()
{
return (this.entityOrRoleName + '#' + this.key.ToString());
}

now in RC2, it is only based on CacheKey.GetHashCode() which is setup in the constructor of CacheKey

public CacheKey(object id, IType type, string entityOrRoleName, ISessionFactoryImplementor factory)
{
this.key = id;
this.type = type;
this.entityOrRoleName = entityOrRoleName;
this.hashCode = type.GetHashCode(this.key, factory);
}


As we see, the CacheKey.entityOrRoleName is no more used to determine the ID for the cache.

=> Conclusion : if I have 2 entities of 2 different classes with the same identifier in the cache, these 2 entities have the same ID in the cache (they share the same key!) => Problem

Thanks for your help !

Of course they don't share the same key as long as they are not Equal()! The fact they have the same hash code means they just share the same bin of the hashtable.