protected static Region getRootRegion() throws CacheException {
    if (cache == null) {
      String s = "Cache not created yet!";
      throw new IllegalStateException(s);
    }

    return cache.getRegion("root");
  }
Returns the root region of the cache. We assume that the {@link Cache} and the root region have
already been created.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/DistributedCacheTestCase.java