code: public ProxyBuilder<T> dexCache(File dexCacheParent) {
          dexCache = new File(dexCacheParent, "v" + Integer.toString(VERSION));
          dexCache.mkdir();
          return this;
      }
docs: Sets the directory where executable code is stored. See {@link
  DexMaker#generateAndLoad DexMaker.generateAndLoad()} for guidance on
  choosing a secure location for the dex cache.