code: public void invalidateMemberCache(Predicate<Class<?>> predicate) {
          if (memberCache == null) {
              return;
          }
          if (predicate == null) {
              memberCache.clear();
          } else {
              memberCache.invalidate((key) -> predicate.test(key.getClazz()));
          }
      }
docs: The member cache may theoretically cause memory leaks due to using hard
  references to {@link Class} and {@link Member} instances. As a temporary
  workaround we provide a way to invalidate the cache or some of its
  entries (e.g. for a concrete classloader).
  
  @param predicate
  If null, all cache entries are discarded, otherwise an entry
  is only discarded if the given predicate returns
  <code>true</code> for the {@link MemberKey#getClass()}