code: public static CacheManager getInstance() {
      ClassLoader _defaultClassLoader = PROVIDER.getDefaultClassLoader();
      return PROVIDER.getManager(_defaultClassLoader, PROVIDER.getDefaultManagerName(_defaultClassLoader));
    }
docs: Get the default cache manager for the default class loader. The default class loader
  is the class loader used to load the cache2k implementation classes.
  
  <p>The name of default cache manager is {@code "default"}.
  This may be changed, by {@link #setDefaultName(String)}.