Hi,
I am trying to retrieve the record CounterVar (id=4, type=1) - see
mapping file description below - in one transaction. In the same
program, with a different transaction, I am trying to retrieve the
record CounterVar (id=1, type=1) in the DbLocked mode. Note that in both
cases the type field references the same record. This results in my
second transaction getting LockNotGrantedException (writeLockTimeout).
When I rollback both transactions and retry the retrieve (in the context
of the same process), I observed that the call to QueryResults.size()
returns 1, but the call to QueryResults.hasMore() returns false. On
further investigation, I found that the call to hasMore() sees the
following exception stack trace:
org.exolab.castor.jdo.ObjectNotFoundException: The object of type
CounterVar with identity 1 was not found in persistent storage
at
org.exolab.castor.persist.LockEngine.load(LockEngine.java:385)
at
org.exolab.castor.persist.TransactionContext.load(TransactionContext.jav
a:651)
at
org.exolab.castor.persist.QueryResults.fetch(QueryResults.java:229)
at
org.exolab.castor.jdo.engine.OQLQueryImpl$OQLEnumeration.hasMore(OQLQuer
yImpl.java:633)
at
org.exolab.castor.jdo.engine.OQLQueryImpl$OQLEnumeration.hasMore(OQLQuer
yImpl.java:614)
at TestWriteLockTimeout.main(TestWriteLockTimeout.java:84)
In looking at the code, I see that LockEngine.load() is actually
converting the exception ObjectDeletedWaitingForLockException into
ObjectNotFoundException.
I am guessing that this is happening because of the previous
(unsuccessful) retrieve. Any idea how this can be fixed?
Regards, Vishal.
PS: I have test programs that simulate this problem. I can send it if
someone is interested in looking at the problem.
I have the following mapping in my test program:
<mapping>
<!-- Mapping for CounterType table -->
<class name="CounterType"
identity="id" key-generator="IDENTITY">
<cache-type type="none" />
<map-to table="COUNTER_TYPE" />
<field name="id" type="integer" >
<sql name="counter_type_id" type="integer"/>
</field>
<field name="description" type="string">
<sql name="counter_type_desc" type="varchar" />
</field>
</class>
<!-- Mapping for CounterVar table -->
<class name="CounterVar"
identity="id" key-generator="IDENTITY">
<cache-type type="none" />
<map-to table="COUNTER_VAR" />
<field name="id" type="integer" >
<sql name="counter_var_id" type="integer"/>
</field>
<field name="number" type="integer" >
<sql name="counter_var_number" type="integer"/>
</field>
<field name="type" type="CounterType">
<sql name="counter_var_type" />
</field>
</class>
</mapping>
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