Hi,
We have been using castor actively for sometime now. In our implementation,
we have an object referencing other object.
ex:
<class name="com.PCPgo.prm.web.scheduler.AppointmentJdo"
identity="appointmentId" key-generator="appointment_seq">
...
<field name="patientJdo" type="com.PCPgo.prm.web.patient.PatientJdo">
<sql name="PA_PATIENT_ID"/>
</field>
...
</class>
We try to update both the objects in the same transaction , which means
change a field in patientJdo and create appointmentJdo. when we do this
sometimes it gives the following exception
org.exolab.castor.jdo.LockNotGrantedException: persist.deadlock
at org.exolab.castor.persist.ObjectLock.detectDeadlock(ObjectLock.java:928)
at org.exolab.castor.persist.ObjectLock.upgrade(ObjectLock.java(Compiled
Code))
at
org.exolab.castor.persist.LockEngine$TypeInfo.upgrade(LockEngine.java(Compil
ed Code))
at
org.exolab.castor.persist.LockEngine$TypeInfo.access$600(LockEngine.java(Inl
ined Compiled Code))
at org.exolab.castor.persist.LockEngine.writeLock(LockEngine.java(Compiled
Code))
at
org.exolab.castor.persist.TransactionContext.writeLock(TransactionContext.ja
va(Compiled Code))
at org.exolab.castor.persist.ClassMolder.preStore(ClassMolder.java(Compiled
Code))
at org.exolab.castor.persist.LockEngine.preStore(LockEngine.java(Compiled
Code))
at
org.exolab.castor.persist.TransactionContext.prepare(TransactionContext.java
(Compiled Code))
at
org.exolab.castor.jdo.engine.DatabaseImpl.commit(DatabaseImpl.java(Compiled
Code))
at
com.PCPgo.prm.web.scheduler.AppointmentAction.execute(AppointmentAction.java
(Compiled Code))
and it locks the patientJdo object.
Is this the right way of doing it. Also , is there any way of release a lock
obtained on a object ?
The reason is once an object is locked, there is no way of releasing the
lock, and we cannot do anything
to the object (I mean update even in a different transaction) until the
server is restarted ?
Thanks
Vijay
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