Remove superfluous double check at validTransaction method

    public final boolean validTransaction(javax.transaction.Transaction tx) {  
        boolean valid = true;  
        if (_theTransaction != null) {  
            valid = _theTransaction.equals(tx);  
*            if (!valid) {  
                valid = _theTransaction.equals(tx);  
            }  *
        }  
        return valid;  
    }