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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1400) Unable to persist a relationship to a detached Entity
Date Mon, 23 Nov 2009 22:19:39 GMT
Unable to persist a relationship to a detached Entity 
------------------------------------------------------

                 Key: OPENJPA-1400
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1400
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 2.0.0-M3, 1.2.1
            Reporter: Rick Curtis
            Assignee: Rick Curtis


I ran into a problem where OpenJPA is unable to persist a relationship from an attached Entity
to a detached Entity. The problem occurs if the detached Entity does not have a DetachedState
{openjpa.DetachState=loaded(DetachedStateField=false)} and the version is zero. When trying
to flush the scenario described, the following exception is thrown by OpenJPA:

<openjpa-2.0.0-SNAPSHOT-r422266:882172M nonfatal user error> org.apache.openjpa.persistence.InvalidStateException:
Encountered unmanaged object in persistent field "org.apache.openjpa.persistence.detachment.model.NoDetachedStateEntityFieldAccess.relationship"
during flush.  However, this field does not allow cascade persist. Set the cascade attribute
for this field to CascadeType.PERSIST or CascadeType.ALL (JPA annotations) or "persist" or
"all" (JPA orm.xml), or enable cascade-persist globally, or manually persist the related field
value prior to flushing. You cannot flush unmanaged objects or graphs that have persistent
associations to unmanaged objects.

This scenario should work, but OpenJPA incorrectly determines that the detached Entity was
never actually a part of a persistence context. If version field is anything other than zero
the flush of the relationship works as expected. This problem is in the enhanced bytecode
we assume that when no StateManager is present a version of zero means that an Entity isn't
detached. 
    // Decompiled Entity bytecode	
    public Boolean pcIsDetached()
    {
        if(pcStateManager != null)
            if(pcStateManager.isDetached())
                return Boolean.TRUE;
            else
                return Boolean.FALSE;
        if(pcGetDetachedState() != null && pcGetDetachedState() != PersistenceCapable.DESERIALIZED)
            return Boolean.TRUE;
        if(_version != 0)
            return Boolean.TRUE;
        else
            return Boolean.FALSE;
    }

I will attach a patch which recreates this problem and also provides a solution. My solution
to this problem is to add a boolean to the enhanced bytecode to keep track of whether or not
the version field has been set. This fixes the problem for most cases, but there are still
holes. In addition to the patch, I'll also post two decompiled Entities. One of those is enhanced
with the existing code and the other is with my proposed changes.

Notes:
- For the sake of time, I did not fix this problem when using unenhanced classes.
- This problem still exists if the detached Entity has been serialized at any point.

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