What is the meaning of this error message and how can i solve it?
<field name="detail" type="com.esuria.erp.store.StockDetail"
required="true" collection="arraylist" direct="false"
lazy="false">
<sql many-table="product"
many-key="stockid"/>
</field>
org.exolab.castor.jdo.ObjectNotPersistentException: The object of type
java.util.ArrayList is not persistent -- it was not queried or created
within this transaction
at
org.exolab.castor.persist.TransactionContext.writeLock(TransactionContext.java:886)
at org.exolab.castor.persist.ClassMolder.preStore(ClassMolder.java:1368)
at org.exolab.castor.persist.LockEngine.preStore(LockEngine.java:697)
at
org.exolab.castor.persist.TransactionContext.prepare(TransactionContext.java:1071)
at org.exolab.castor.jdo.engine.DatabaseImpl.commit(DatabaseImpl.java:469)
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