code: public Collection<V> values()
    {
      if (TraceComponent.isAnyTracingEnabled() && _tc.isEntryEnabled()) SibTr.entry(this, _tc, "values");
      
      UnsupportedOperationException uoe = new UnsupportedOperationException();
      
      if (TraceComponent.isAnyTracingEnabled() && _tc.isEntryEnabled()) SibTr.exit(this, _tc, "values", uoe);
      throw uoe;
    }
docs: This method is NOT supported and always throws UnsupportedOperationException
  
  @see Map#values()