spring管理的ehcache缓存没有起做用的原因

Dao代码如下：

@Repositorybr/>@EnableCaching
class UserDao(jdbcTemplate: JdbcTemplate) {

@Cacheable(keyGenerator = "cacheKeyGenerator", cacheNames = Array("merInfo"))
private def findByName(name: String): Option[User] = {

            val sql = ""        //此处为sql
                val rs = jdbcTemplate.queryForRowSet(sql, name)
                if (rs.next()) {
                    Some(User(
                        rs.getString("name"),
                        rs.getString("age")
                    ))
                } else None
            }

    def findUser(name: String):     Option[User] =  {
        findByName(name)
    }

}