code: public DomainCommandBuilder setProcessControllerPort(final String port) {
          if (port != null) {
              setProcessControllerPort(Integer.parseInt(port));
          }
          return this;
      }
docs: Sets the port on which the process controller listens for communication from processes it controls. Ignores
  {@code null} values or values less than 0.
  
  @param port the port
  
  @return the builder
  
  @throws java.lang.NumberFormatException if the port is not a valid integer