protected static void closeCache() {
    if (cache != null && !cache.isClosed()) {
      DistributedSystem sys = cache.getDistributedSystem();
      cache.close();
      sys.disconnect();
      cache = null;
    }

    disconnectFromDS();
  }
This is a hack using reflection to clear the static objects in JSSE since otherwise changing
the javax.* store related properties has no effect during the course of running dunit suite
unless the VMs are restarted.
geode-dunit/src/main/java/org/apache/geode/security/SecurityTestUtils.java