code: public static String getEnv(){
          if(ENV == null){
              if(!blank(System.getenv("ACTIVE_ENV"))) {
                  ENV = System.getenv("ACTIVE_ENV");
              }
  
              if(!blank(System.getProperty("ACTIVE_ENV"))) {
                  ENV = System.getProperty("ACTIVE_ENV");
              }
  
              if(!blank(System.getProperty("active_env"))) {
                  ENV = System.getProperty("active_env");
              }
  
              if(blank(ENV)){
                  ENV = "development";
                  LogFilter.log(LOGGER, LogLevel.INFO, "Environment variable ACTIVE_ENV not provided, defaulting to '" + ENV + "'");
              }
          }
          return ENV;
      }
docs: Returns name of environment, such as "development", "production", etc.
  This is a value that is usually setup with an environment variable <code>ACTIVE_ENV</code>.
  
  @return name of environment