[Java] @Cacheable 拼接key的操作

@Cacheable(value = "page_user",key ="T(String).valueOf(#page).concat('-').concat(#pageSize)",unless = "#result=null")//由于page是int型,concat要求变量必须为String,所以强转一下
@Override
public List<SysUserEntity> page(int page, int pageSize) {
  return userMapper.page(page,pageSize);
}

@Cacheable(value = CacheConstant.APPLICATION,key = "'id_map'")

org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'lang_code_map' cannot be found on object of type 'org.springframework.cache.interceptor.CacheExpressionRootObject' - maybe not public or not valid?