Hello,
I'm using OJB 1.0.3 with the ODMG api and I'm confused about implicit
locking. I prefer from past experience to have ImplicitLocking=false
in my OJB.properties and this is what I've done for quite some time.
I've started getting (sometimes) LockNotGrantedExceptions on objects
that I haven't explicitly locked -- i.e. I lock a new object for write,
and despite having implicit locking set to false, ojb attempts to aquire
a write lock on a referenced object that hasn't changed (otherwise I'd
have explicitly locked it). The stack trace below shows the failure on
User, which is referenced by the new record:
org.odmg.LockNotGrantedException: Can not lock for WRITE:
ca.accesstec.acsis.core.security.User{1}
at
org.apache.ojb.odmg.TransactionImpl.doSingleLock(TransactionImpl.java:319)
at
org.apache.ojb.odmg.TransactionImpl.lockAndRegister(TransactionImpl.java:263)
at
org.apache.ojb.odmg.ObjectEnvelopeTable.cascadeInsertSingleReferences(ObjectEnvelopeTable.java:601)
at
org.apache.ojb.odmg.ObjectEnvelopeTable.cascadeInsertFor(ObjectEnvelopeTable.java:561)
at
org.apache.ojb.odmg.ObjectEnvelopeTable.cascadeMarkedForInsert(ObjectEnvelopeTable.java:541)
at
org.apache.ojb.odmg.ObjectEnvelopeTable.cascadingDependents(ObjectEnvelopeTable.java:510)
at
org.apache.ojb.odmg.ObjectEnvelopeTable.writeObjects(ObjectEnvelopeTable.java:169)
at
org.apache.ojb.odmg.TransactionImpl.doWriteObjects(TransactionImpl.java:370)
at
org.apache.ojb.odmg.TransactionImpl.prepareCommit(TransactionImpl.java:687)
at org.apache.ojb.odmg.TransactionImpl.commit(TransactionImpl.java:623)
Can someone kindly explain this to me? or at least suggest how I can
tell OJB to only write-lock objects for which I call
Transaction.lock()? I have traced through this and don't see why
ObjectEnvelopeTable needs to do a cascadingDependents().
Could the real problem be somewhere else?
Many thanks in advance,
Colin
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