【Java 27 岁】Spring中三级缓存以及循环依赖问题解决方案
一级二级三级缓存 目标类在哪
DefaultSingletonBeanRegistryprivate final Map<String, Object> singletonObjects = new ConcurrentHashMap(256); 1级 private final Map<String, ObjectFactory<?>> singletonFactories = new HashMap(16); 3级 private final Map<String, Object> earlySingletonObjects = new HashMap(16); 2 级