/spring-pro-6-default-proxy-issue

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Simply the best ;)

Spring Boot 3.0 by default use CGLib proxy

Thank you Iuliana @iuliana Cosmina for Spring Pro 6: it is one of the best books for preparation for VMWare Spring Professional Certification. I think that the best way to prepare for certification read that book and some practical experience.

During reading the book was found minor issue: starting from Spring 5, Spring AOP by default uses CGLib proxy. Hope my investigation will help to improve the book.

Steps to reproduce:

  1. Add spring-boot-starter-<something> to build.gradle.kts: it will add transitive dependency spring-boot-autoconfigure
  2. At spring-boot-autoconfigure we can see spring.factories: there is configuration TransactionAutoConfiguration that will be started after context start up
  3. TransactionAutoConfiguration works only if at classpath exists in PlatformTransactionManager
  4. Most important part of TransactionAutoConfiguration is EnableTransactionManagementConfiguration:
  5. By default for all modern Spring Boot applications used spring.aop.proxy-target-class=true. It means that Spring AOP will use CGLib proxy by default
  6. Simply run ./tools/scripts/run.sh to make sure :)