关于springboot:项目启动超慢记录

最近新人在开发我的项目过程中革新了很多代码，启动过程中发现十分慢，于是我进去帮忙排查，简略记录下；

我的项目启动我开启了 debug 日志，发现次要耗时卡在 jooq 下面；

2023-06-16 19:43:31,346 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Autowiring by type from bean name 'dslContext' via factory method to bean named 'jooqConfiguration' 
2023-06-16 19:43:31,957 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'dslContext' to allow for resolving potential circular references 
2023-06-16 19:43:32,182 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 
2023-06-16 19:43:32,183 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 
2023-06-16 19:51:45,172 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'dslContext' 
2023-06-16 19:51:45,173 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'jooqConfiguration' 
2023-06-16 19:51:45,173 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'spring.jooq-org.springframework.boot.autoconfigure.jooq.JooqProperties' 
2023-06-16 19:51:45,173 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration' 
2023-06-16 19:51:45,173 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'dataSourceConnectionProvider' 
2023-06-16 19:51:45,173 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'transactionProvider' 

发现实现 dslcontext 用了足足 8 分钟

2023-06-16 19:43:32,183 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor' 
2023-06-16 19:51:45,172 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'dslContext' 

深刻排查一下 dslContext 为啥这么慢，升入源码通过条件断点看了下，发现次要耗时在
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#applyBeanPostProcessorsAfterInitialization

目前来看 AnnotationAwareAspectJAutoProxyCreator 的处理器，该处理器会扫描 dslContext 中的办法，并逐个判断以后的形式是否须要动静代理。dslContext 中蕴含约几百上千的办法启动天然会很慢；

我的项目中之前就存在 jooq，为啥忽然扫描了；

diff 比对革新的代码发现新增了 @Aspect 切面代码，而且扫码全工程门路，导致很慢

@Pointcut("execution( * com.alibaba.xxx..*(..))")
   public void getMethods() {}

切面匹配是一个耗时的工作，最好缩小范畴，匹配的表达式越准确越好；

例子不难，思路很明确，最近在眼睛 chatgpt 插件联合 RPA 看下这类场景能不能自动化，提高效率，还在摸索 ing，后续有机会分享下；