docs: public void setSelectedEnvVars (final Set <String> aCollection)
    {
      selectedEnvVars = new HashSet <> ();
      if (aCollection != null)
      {
        for (final String sName : aCollection)
          if (StringHelper.hasText (sName))
            if (!selectedEnvVars.add (sName))
              getLog ().warn ("The selected environment variable '" + sName + "' is contained more than once");
      }
      if (!selectedEnvVars.isEmpty ())
      {
        // If we have a set of selected, don't use all
        if (withAllEnvVars)
        {
          getLog ().warn ("Disabling all environment variables, because selected environment variables are defined!");
          setWithAllEnvVars (false);
        }
      }
    }