Hibernate version: 3.0.3

Mapping documents:
the following is a model fragment to demonstrate my problem:


The following instance diagram depicts the makeup of the object graph:





The associated scenario is that a new MO_B needs to be created.
This is achieved by adding a new Cmd derived class which knows how
to construct a MO_B. So far nothing special. In order to construct an
MO_B, a lookup is performed to see if the ref1/ref2 objects already exist
in the database. If they're not, then they get created using their
respective Cmd classes. When such an event occurs, the new Cmd
instance is added to the parent Cmd.

In the case under test, ref1 (the first MO_A to be looked up) needs to be
instantiated and the appropriate Cmd instance together with the new
MO_A (the type of ref1) are added to the parent Cmd.

However, when ref2 is attempted to be looked up, Hibernate performs an
autoflush and throws the exception below. This is happening when it
attempts to perform a flush on the Project instance p which is comprised
of the objects as shown above.
When Hibernate gets to the MO_A_Cmd instance, is detects that
MO_B_Cmd is also transient and throws the exception.



Full stack trace of any exception that occurs:
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: beans.Cmd
at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:216)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:99)
at org.hibernate.type.EntityType.isDirty(EntityType.java:216)
at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:412)
at org.hibernate.persister.entity.BasicEntityPersister.findDirty(BasicEntityPersister.java:2528)
at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:343)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:108)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:190)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:70)
at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:39)
at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:711)
at org.hibernate.impl.SessionImpl.prepareQueries(SessionImpl.java:895)
at org.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:885)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:834)


Debug level Hibernate log excerpt:
14:26:18,031 DEBUG main org.hibernate.hql.ast.QueryTranslatorImpl - compile() : The query is already compiled, skipping...
14:26:18,031 DEBUG main org.hibernate.event.def.AbstractFlushingEventListener - flushing session
14:26:18,031 DEBUG main org.hibernate.event.def.AbstractFlushingEventListener - processing flush-time cascades
14:26:18,046 DEBUG main org.hibernate.engine.Cascades - done processing cascade ACTION_SAVE_UPDATE for: *** other application objects
14:26:18,046 DEBUG main org.hibernate.engine.Cascades - processing cascade ACTION_SAVE_UPDATE for: <application>.model.beans.Project
14:26:18,046 DEBUG main org.hibernate.engine.Cascades - cascade ACTION_SAVE_UPDATE for collection: <application>.model.beans.Project.commands
14:26:18,046 DEBUG main org.hibernate.engine.Cascades - cascading to saveOrUpdate: <application>.command.beans.Cmd
14:26:18,046 DEBUG main org.hibernate.engine.Cascades - id unsaved-value: -1
14:26:18,046 DEBUG main org.hibernate.event.def.AbstractSaveEventListener - transient instance of: <application>.command.beans.Cmd
14:26:18,046 DEBUG main org.hibernate.event.def.DefaultSaveOrUpdateEventListener - saving transient instance
14:26:18,046 DEBUG main org.hibernate.jdbc.AbstractBatcher - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
14:26:18,046 DEBUG main org.hibernate.SQL - select hibernate_sequence.nextval from dual
14:26:18,046 DEBUG main org.hibernate.jdbc.AbstractBatcher - preparing statement
14:26:18,062 DEBUG main org.hibernate.id.SequenceGenerator - Sequence identifier generated: 3051
14:26:18,062 DEBUG main org.hibernate.jdbc.AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
14:26:18,062 DEBUG main org.hibernate.jdbc.AbstractBatcher - closing statement
14:26:18,062 DEBUG main org.hibernate.event.def.AbstractSaveEventListener - generated identifier: 3051, using strategy: org.hibernate.id.SequenceGenerator
14:26:18,062 DEBUG main org.hibernate.event.def.AbstractSaveEventListener - saving [<application>.command.beans.Cmd#3051]
14:26:18,062 DEBUG main org.hibernate.engine.Cascades - processing cascade ACTION_SAVE_UPDATE for: <application>.command.beans.Cmd
14:26:18,062 DEBUG main org.hibernate.engine.Cascades - done processing cascade ACTION_SAVE_UPDATE for: <application>.command.beans.Cmd
14:26:18,062 DEBUG main org.hibernate.event.def.WrapVisitor - Wrapped collection in role: <application>.command.beans.Cmd.sources
14:26:18,062 DEBUG main org.hibernate.event.def.WrapVisitor - Wrapped collection in role: <application>.command.beans.Cmd.commands
14:26:18,062 DEBUG main org.hibernate.engine.Cascades - id unsaved-value: -1
14:26:18,062 DEBUG main org.hibernate.engine.Cascades - processing cascade ACTION_SAVE_UPDATE for: <application>.command.beans.Cmd
14:26:18,062 DEBUG main org.hibernate.engine.Cascades - cascade ACTION_SAVE_UPDATE for collection: <application>.command.beans.Cmd.sources
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - cascading to saveOrUpdate: null
14:26:18,078 DEBUG main org.hibernate.event.def.AbstractSaveEventListener - persistent instance of: <application>.model.beans.VNE
14:26:18,078 DEBUG main org.hibernate.event.def.DefaultSaveOrUpdateEventListener - ignoring persistent instance
14:26:18,078 DEBUG main org.hibernate.event.def.DefaultSaveOrUpdateEventListener - object already associated with session: [<application>.model.beans.VNE#3050]
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done cascade ACTION_SAVE_UPDATE for collection: <application>.command.beans.Cmd.sources
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - cascade ACTION_SAVE_UPDATE for collection: <application>.command.beans.Cmd.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done cascade ACTION_SAVE_UPDATE for collection: <application>.command.beans.Cmd.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - deleting orphans for collection: <application>.command.beans.Cmd.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done deleting orphans for collection: <application>.command.beans.Cmd.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done processing cascade ACTION_SAVE_UPDATE for: <application>.command.beans.Cmd
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done cascade ACTION_SAVE_UPDATE for collection: <application>.model.beans.Project.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - deleting orphans for collection: <application>.model.beans.Project.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done deleting orphans for collection: <application>.model.beans.Project.commands
14:26:18,078 DEBUG main org.hibernate.engine.Cascades - done processing cascade ACTION_SAVE_UPDATE for: <application>.model.beans.Project
14:26:18,078 DEBUG main org.hibernate.event.def.AbstractFlushingEventListener - dirty checking collections
14:26:18,078 DEBUG main org.hibernate.engine.CollectionEntry - Collection dirty: [<application>.model.beans.Project.commands#3037]
14:26:18,078 DEBUG main org.hibernate.engine.CollectionEntry - Collection dirty: [<application>.model.beans.Project.objectMap#3037]
14:26:18,078 DEBUG main org.hibernate.event.def.AbstractFlushingEventListener - Flushing entities and processing referenced collections
14:26:18,078 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.NE.ports#3038], was: [<application>.model.beans.NE.ports#3038] (uninitialized)
14:26:18,078 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.NE.vnes#3038], was: [<application>.model.beans.NE.vnes#3038] (uninitialized)
14:26:18,078 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.NE.baseAddresses#3038], was: [<application>.model.beans.NE.baseAddresses#3038] (uninitialized)
14:26:18,093 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.NE.ports#3040], was: [<application>.model.beans.NE.ports#3040] (uninitialized)
14:26:18,093 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.NE.vnes#3040], was: [<application>.model.beans.NE.vnes#3040] (uninitialized)
14:26:18,093 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.NE.baseAddresses#3040], was: [<application>.model.beans.NE.baseAddresses#3040] (initialized)
14:26:18,093 DEBUG main org.hibernate.event.def.DefaultFlushEntityEventListener - Updating entity: [<application>.model.beans.Project#3037]
14:26:18,093 DEBUG main org.hibernate.engine.Versioning - Incrementing: 0 to 1
14:26:18,093 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.Project.commands#3037], was: [<application>.model.beans.Project.commands#3037] (uninitialized)
14:26:18,093 DEBUG main org.hibernate.engine.Collections - Collection found: [<application>.model.beans.Project.objectMap#3037], was: [<application>.model.beans.Project.objectMap#3037] (initialized)
14:26:18,093 DEBUG main org.hibernate.engine.Cascades - id unsaved-value: -1






What do I need to do in order to avoid this? I would like to avoid changing
the cascade level, since then persistence operation will no longer be
transparent as they are now.