Hello
We have configured a distributed transaction in our application server and
we are using openjpa 1.2.1 and Glassfish application server. Although the
default behavior of transaction locking must be optimistic,
it seems that pessimistic locking has been happened.
It is found that Row Lock contention happens in a specific table.
This is the exception :
java.sql.SQLException: ORA-02049: timeout: distributed transaction waiting
for lock
For your information, already all the following properties have been set.
1. <persistence-unit name="JPXA" transation-type="JTA">
2. <property name="openjpa.TransactionMode" value="managed"/>
3. <property name="openjpa.ManagedRuntime"
value="jndi(TransactionManagerName=java:appserver/TransactionManager)"/>
Following searching about this locking problem, we found that we should add
two more properties for openjpa as listed below.
<property name="openjpa.LockManager" value="version" />
<property name="openjpa.jdbc.TransactionIsolation" value="read-committed" />
but this time we have got another error:
org.apache.openjpa.persistence.PersistenceException: ORA-02089: COMMIT is
not allowed in a subordinate session.
Thanks for any help.
Regards,
Sargol
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