Update spring-knowledge-and-questions-summary.md #2584
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只用两级缓存够吗？ 在没有 AOP 的情况下，确实可以只使用一级和二级缓存来解决循环依赖问题。但是，当涉及到 AOP 时，三级缓存就显得非常重要了，因为它确保了即使在 Bean 的创建过程中有多次对早期引用的请求，也始终只返回同一个代理对象，从而避免了同一个 Bean 有多个代理对象的问题。