#fixed code
                                private void initTxServiceClient() {
        txZKClientService = TransactionFactory.getTransactionProvider().getTransactionContext().setTransactionClient(config, props, connectionInfo);
    }
#vulnerable code 
                                private void initTxServiceClient() {
        txZKClientService = TransactionFactory.getTransactionFactory().getTransactionContext().setTransactionClient(config, props, connectionInfo);
    } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE