要加cacheNames ；不然报错：
java.lang.IllegalStateException: No cache could be resolved for 'Builder[public abstract java.util.List com.test.findByXXX()] caches=[] | key='' | keyGenerator='' | cacheManager='' | cacheResolver='' | condition='' | unless='' | sync='false'' using resolver 'org.springframework.cache.interceptor.SimpleCacheResolver@12fddded'. At least one cache should be provided per cache operation.
解决办法：
@Cacheable(cacheNames = {"user","user"},key = "#id")
作者：我想起个好名字
链接：https://www.jianshu.com/p/101704f462e1
来源：简书
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