code: public void prepareUpdateStep6() {
  
          Set<String> forced = new HashSet<String>();
          forced.add("driver.subscription");
          forced.add("db.subscription.driver");
          forced.add("db.subscription.pool");
          forced.add("db.subscription.sqlmanager");
          addSubscriptionDriver();
          if (isInitialized()) {
              // lock the wizard for further use
              lockWizard();
              // save Properties to file "opencms.properties"
              saveProperties(getProperties(), CmsSystemInfo.FILE_PROPERTIES, false, forced);
              deleteEmptyJars();
          }
      }
docs: Prepares step 6 of the update wizard.<p>