What is the 'best' way to do distributed transactions across multiple databases using Spring and Hibernate

try {
    TransactionTemplate tt = new TransactionTemplate(txManager);

    tt.execute(new TransactionCallbackWithoutResult(){
	protected void doInTransactionWithoutResult(
			TransactionStatus status) {
        updateDb1();
        updateDb2();
    }
} catch (TransactionException ex) {
    // handle
}