private static Interner<String> getInterner() {
    Interner<String> interner = SoftReference.dereference(ourSharedInterner);
    if (interner == null) {
      interner = Interner.createStringInterner();
      ourSharedInterner = new WeakReference<>(interner);
    }
    return interner;
  }
private static Interner<String> getInterner()