Repeated locking in ODMG fails

[sclark]

I'm having trouble managing locks in my object graph, mostly because of implicit 
locking.  I have the following code:

    tx = odmg.newTransaction();
    tx.begin();
    UserDefinedSite site = findSiteBySomeQuery();
    ...
    tx.lock(site, tx.WRITE);
    ...
    tx.lock(site.getDescription(), tx.WRITE);
    tx.commit();

The second call to lock() throws LockNotGrantedException; it appears that OJB 
believes it cannot obtain a lock because the description object is already 
locked, even though that lock is held by the current transaction.

I am using 0.9.8 (with the next revision of ObjectEnvelopeTable after the 
release), and I have ImplicitLocking=true and LockAssociations=WRITE.

Should this code work?  If so, any clues why it doesn't?

The relevant portion of repository.xml:

  <class-descriptor
    class="gov.doi.cap.dataobjects.UserDefinedSite"
    table="USER_DEFINED_SITE" >

    <field-descriptor id="1"
      name="siteId"
      column="SITE_ID"
      jdbc-type="INTEGER"
      primarykey="true"
    />

    <reference-descriptor
      name="description"
      class-ref="gov.doi.cap.dataobjects.SiteDescriptionImpl" >
      <foreignkey field-id-ref="1" />
    </reference-descriptor>
  </class-descriptor>

  <class-descriptor
    class="gov.doi.cap.dataobjects.SiteDescriptionImpl"
    proxy="dynamic"
    table="SITE_DESCRIPTION" >
    
    <field-descriptor id="1"
      name="siteId"
      column="SITE_ID"
      jdbc-type="INTEGER"
      primarykey="true"
      autoincrement="true"
      sequence-name="SiteID"
    />
  </class-descriptor>


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