code: protected Pair<Integer, InputStream> executeCommand(String command) {
          int resultVal = 1;
          InputStream inputStream = null;
          try {
              logger.debug("Executing command: {}", command);
              Process process =  Runtime.getRuntime().exec(command);
  
              resultVal = process.waitFor();
              inputStream = process.getInputStream();
  
          } catch (InterruptedException e) {
              logger.info("Execution of {} failed: code - {} ; message - {}", command, resultVal, e.getMessage());
              Thread.currentThread().interrupt();
          } catch (IOException  e) {
              logger.info("Execution of {} failed: code - {} ; message - {}", command, resultVal, e.getMessage());
          }
          if (inputStream == null) {
             // Create an empty InputStream instead of returning a null
             inputStream = new InputStream() {
                 @Override
                 public int read() throws IOException {
                     return -1;
                 }
             } ;
          }
          return new Pair<>(resultVal, inputStream);
      }
docs: from old command's stream and the new command's stream