用了红薯大哥的EhCache缓存代码，调试后出错，各位大侠能否给一个些建议？? 400 报错

用了红薯大哥的EhCache缓存代码，调试后出错，各位大侠能否给一个些建议？? 400 报错

用了红薯大哥的EhCache缓存代码，调试后出错，各位大侠能否给一个些建议？

用了QueryHelper中的query_cache

 /**
  * 支持缓存的对象查询
  * @param <T>
  * @param beanClass
  * @param cache_region
  * @param key  (Serializable) result
  * @param sql
  * @param params
  * @return
  */
 public static <T> List<T> query_cache(Class<T> beanClass, String cache_region, Serializable key, String sql, Object...params) {  
  List<T> objs = (List<T>)CacheManager.get(cache_region, key);
  if(objs == null){
   objs = query(beanClass, sql, params);
   CacheManager.set(cache_region, key, (Serializable)objs);
  }
  return objs;
 }

调试以下代码

 public static void FindAlljsonArray() throws Exception {
  // 查询条件
  String sql = "select Id,MenuName from Menu where Id!=?";
  Object[] params = new Object[] {0};
   String key="MenuCachekey";
  List<Menu> results = null;
  results = (ArrayList<Menu>) QueryHelper.query_cache(Menu.class,"reginon1",(Serializable) key,sql, params);
  JSONArray jsonArray = JSONArray.fromObject(results);
  System.out.println(jsonArray);
  results = null;
  jsonArray.clear();
 }

结果显示是

java.lang.NullPointerException
 at cache.EhCacheProvider.buildCache(EhCacheProvider.java:34)
 at cache.EhCacheProvider.buildCache(EhCacheProvider.java:1)
 at cache.CacheManager._GetCache(CacheManager.java:35)
 at cache.CacheManager.get(CacheManager.java:46)
 at DBPool.QueryHelper.query_cache(QueryHelper.java:137)
 at dao.DBtest.FindAlljsonArray(DBtest.java:30)

到底是哪里出了问题呢？