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From "Jay D. McHugh" <>
Subject Re: ejb 3.0--connecting to a DB
Date Wed, 20 Jun 2007 16:16:25 GMT

I just looked again at your original email and persistence.xml - you are 
already setting openjpa.jdbc.SynchronizeMappings to false, so hopefully 
your whole problem is just related to transactions.


Viet Hung Nguyen wrote:
> I am deploying my db pool through the admin console. I am using the 
> tranql-connector-1.3.rar found under 
> geronimo-jetty6-jee5-2.0-SNAPSHOT\repository\org\tranql\tranql-connector-ra\1.3. 
> I am still encountering these two problems:
> 1) The EJB seems to be talking to the DB, but whenever I query it, the 
> data in the DB is erased.
> 2) In order to have some data in the DB I have added things to it 
> dynamically. So when I fetch the data from the DB after this addition, 
> the resultList is non-empty. However, when I try to view what I have 
> just added by casting one element of the resultant list (that is of 
> type Collection<ExchangeRate>) to an ExchangeRate object with this line:
>    ExchangeRate rate = (ExchangeRate)ratesList.get(i);
> I get a ClassCastException. Initially I thought ratesList might be 
> null, but I have ensured that it is not.
> For problem 1) I have read somewhere that there is a property I can 
> set so that it does not overwrite the existing data in the DB, but I 
> cannot remember what that is.
> As for problem 2) I am out of ideas.
> Thanks in advance,
> Viet Nguyen
> .

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