如何在EclipseLink中配置查询缓存

这里发布的解决方案对我不起作用.但我已经使它成功:

@Cache
@NamedQueries({@NamedQuery(
      name = "State.findAll",
      query = "SELECT s FROM State s", 
      hints = {
          @QueryHint(name = QueryHints.QUERY_RESULTS_CACHE, value = HintValues.TRUE)
      }
    )})