Thread: [nhibernate-issues] [NHJIRA] Created: (NH-2673) Nhibernate 2nd level cache and Result transformer

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Nhibernate 2nd level cache and Result transformer
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                 Key: NH-2673
                 URL: http://216.121.112.228/browse/NH-2673
             Project:  NHibernate
          Issue Type: Bug
          Components: Core
    Affects Versions: 3.2.0Alpha2
            Reporter: Josef Holan
            Priority: Blocker
         Attachments: Caching.zip

I have a big problem with 2nd level cache in NHibernate. Everything is working fine(Cache is running well) until I use

.SetResultTransformer(new DistinctRootEntityResultTransformer())

Example code:

using (var session = SessionFactory.OpenSession())
            {
                Console.WriteLine("---> using query first time");
                var query = session
                    .CreateQuery("from Blog b where b.Author = :author")
                    .SetString("author", "Gabriel")
                    .SetCacheable(true)
                    .SetResultTransformer(new DistinctRootEntityResultTransformer())
                    ;
                var list = query.List<Blog>();
            }

Exception:

NHibernate.PropertyAccessException: Exception occurred getter of Caching.Blog.Id
v NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get(Object target) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Properties\BasicPropertyAccessor.cs: line 211
v NHibernate.Tuple.Entity.AbstractEntityTuplizer.GetIdentifier(Object entity) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Tuple\Entity\AbstractEntityTuplizer.cs: line 139
v NHibernate.Persister.Entity.AbstractEntityPersister.GetIdentifier(Object obj, EntityMode entityMode) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs: line 3883
v NHibernate.Persister.Entity.AbstractEntityPersister.IsTransient(Object entity, ISessionImplementor session) v d:\CSharp\NH\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs: line 3669
v NHibernate.Engine.ForeignKeys.IsTransient(String entityName, Object entity, Nullable`1 assumed, ISessionImplementor session) v ForeignKeys.cs: line 194
v NHibernate.Engine.ForeignKeys.GetEntityIdentifierIfNotUnsaved(String entityName, Object entity, ISessionImplementor session) v ForeignKeys.cs: line 250
v NHibernate.Type.ManyToOneType.Disassemble(Object value, ISessionImplementor session, Object owner) v ManyToOneType.cs: line 137
v NHibernate.Cache.StandardQueryCache.Put(QueryKey key, ICacheAssembler[] returnTypes, IList result, Boolean isNaturalKeyLookup, ISessionImplementor session) v StandardQueryCache.cs: line 82
v NHibernate.Loader.Loader.PutResultInQueryCache(ISessionImplementor session, QueryParameters queryParameters, IType[] resultTypes, IQueryCache queryCache, QueryKey key, IList result) v Loader.cs: line 1668
v NHibernate.Loader.Loader.ListUsingQueryCache(ISessionImplementor session, QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes) v Loader.cs: line 1617
v NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes) v Loader.cs: line 1591
v NHibernate.Hql.Ast.ANTLR.Loader.QueryLoader.List(ISessionImplementor session, QueryParameters queryParameters) v QueryLoader.cs: line 300
v NHibernate.Hql.Ast.ANTLR.QueryTranslatorImpl.List(ISessionImplementor session, QueryParameters queryParameters) v QueryTranslatorImpl.cs: line 111
v NHibernate.Engine.Query.HQLQueryPlan.PerformList(QueryParameters queryParameters, ISessionImplementor session, IList results) v HQLQueryPlan.cs: line 105
v NHibernate.Impl.SessionImpl.List(String query, QueryParameters queryParameters, IList results) v SessionImpl.cs: line 616
v NHibernate.Impl.SessionImpl.List<T>(String query, QueryParameters parameters) v SessionImpl.cs: line 592
v NHibernate.Impl.QueryImpl.List<T>() v QueryImpl.cs: line 94
v UnitTests.when_having_blog_with_posts.trying_to_cache_a_complex_query() v Blog_Spec.cs: line 110 

Mapping:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="Caching"
                   assembly="Caching">
  <class name="Blog">
    <cache usage="read-write"/>
    <id name="Id">
      <generator class="hilo"/>
    </id>
    <property name="Author"/>
    <property name="Name"/>
    <set name="Posts" cascade="all" lazy="true">
      <cache usage="read-write"/>
      <key column="BlogId"/>
      <one-to-many class="Post"/>
    </set>
  </class>

  <class name="Post">
    <cache usage="read-write"/>
    <id name="Id">
      <generator class="hilo"/>
    </id>
    <property name="Title"/>
    <property name="Body"/>
  </class>

</hibernate-mapping>

Classes:

 public class Blog
    {
        public virtual int Id { get; set; }
        public virtual string Author { get; set; }
        public virtual string Name { get; set; }
        public virtual ISet<Post> Posts { get; set; }

        public Blog()
        {
            Posts = new HashedSet<Post>();
        }
    }

 public class Post
    {
        public virtual int Id { get; private set; }
        public virtual string Title { get; set; }
        public virtual string Body { get; set; }
    }

nhibernate.config:

<property name="cache.provider_class">NHibernate.Cache.HashtableCacheProvider</property>
<property name="cache.use_second_level_cache">true</property>
<property name="cache.use_query_cache" >true</property>

In summary: Cache and nhibernate running well until i use result transformer. To work i must disable transformer or 2nd level cache. It is not working together

This is only example, i know that distinct in this situation is stupid.

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