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Have you restarted JBoss on the server? I encountered similar issues some years ago with transactions that ran longer than the default 5 minutes (which happened to many transactions that were started while a big MyISAM table needed to be repaired). After changing TransactionTimeout to 1 hour I did not see the error again.
--- ejb-deployer.xml : TransactionTimeout increased from 300 to 3600 ---
<!-- JBoss Transactions JTA -->
<mbean code="com.arjuna.ats.jbossatx.jta.TransactionManagerService" name="jboss:service=TransactionManager">