code: public void setDomainEnvironment() {
          systemProperties = System.getProperties();
          if (System.getProperty(SET_DOMAIN_ENVIRONMENT) != null) {
              logger.debug("Setting System environment properties to Security Domain values");
              for (int i = 0; i < ENVNAMES.length; i++) {
                  setOrClearSystemProperties(ENVNAMES[i], domainProperties);
              }
          }
      }
docs: Sets the System environment to support the Security Domain's settings. This is used for protocols which only read their crypto
  settings via environment variables.
  <br>Also see {@link #restoreSystemEnvironment()}