Problem in using Unit of Work with executeNonSelectingCall() method

Question

Hi,
I am using external Connection Pooling and Transaction Controller of JBoss in Toplink.
When I am getting the data from DB and do "clientSession.release();", it works fine.
I get the clientSession as follows:
serversession = (Server) SessionManager.getManager().getSession(new XMLSessionConfigLoader(),"Session", Thread.currentThread().getContextClassLoader(), false, true);
serversession.login();
ClientSession clientsession = serversession.acquireClientSession();
I am facing the problems in two cases:
Case 1: But when I get the UOW through "transaction = clientSession.getActiveUnitOfWork();" and insert the data, commit and do "clientSession.release();", I get the following error:
[CachedConnectionManager] Closing a connection for you. Please close them yourself: org.jboss.resource.adapter.jdbc.WrappedConnection@c42091
I removed clientSession.release(); from my finally{} block still I am getting the same error.
Case 2: But when I get the UOW through "transaction = clientSession.acquireUnitOfWork();" and insert the data, commit and do "clientSession.release();", I get the following error:
17:48:55,670 ERROR [LogInterceptor] TransactionRolledbackLocalException in method: public abstract java.lang.String com.pearson.pix.business.purchaseorder.interfaces.PurchaseOrderLocal.saveOrderConfirmation(com.pearson.pix.dto.purchaseorder.POHeader) throws com.pearson.pix.exception.AppException, causedBy:
org.jboss.tm.JBossRollbackException: Unable to commit, tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=asad/139, BranchQual=, localId=139] status=STATUS_NO_TRANSACTION; - nested throwable: (java.lang.NullPointerException)
     at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:354)
I am not able to understand what to do. Pls. help.
Thanks

Answer 1

Locking a row that does not exist can be difficult.
On most database you can lock an entire table through "LOCK TABLE <table>", however this may be extreme. Potentially you could also insert an empty row into the table with the id that you want to lock, then you would have a write lock on the row until you commit the transaction.