/** {@inheritDoc} */
@Override
public TransactionContext start() throws Exception {
TransactionContext txnContext = holder.get();
if (txnContext != null) {
throw new TransactionException("A transaction was found in the ThreadLocal.");
}
txnContext = new DefaultTransactionContext();
holder.set(txnContext);
// Check the thread locals for known resources
Connection connection = ConnectionContext.get();
if (connection != null) {
txnContext.add(new JDBCTransactionalResource(connection));
}
EntityManager em = EntityManagerContext.get();
if (em != null) {
txnContext.add(new JPATransactionalResource(em));
}
return txnContext;
}
