How could this has cycle dependencies?

Question

When launching my java application, I got the following errors:

***************************
APPLICATION FAILED TO START
***************************

Description:

The dependencies of some of the beans in the application context form a cycle:

┌──->──┐
|  securityConfiguration
└──<-──┘

Although the log is vivid, I still don't understand how SecurityConfiguration has cycle bean dependencies.

Stackoverflow doesn't allow me to easily paste the codes of SecurityConfiguration, so here they are: https://gist.github.com/blackmonkey/615232845025663597a2ba5f711caff5

Does this answer your question? [Spring boot 2.6.0 Error creating bean with name 'webSecurityConfig'](https://stackoverflow.com/questions/70254555/spring-boot-2-6-0-error-creating-bean-with-name-websecurityconfig) — Henning, Jun 03 '22 at 17:54
Thanks a lot, @Henning! It does answer my question. Please add you answer and I'll mark it. — Oscar Cai, Jun 03 '22 at 18:36

score 1 · Accepted Answer · answered Jun 04 '22 at 15:39

The problem is the password encoder. It is required to build the auto-configured beans that you are injecting in the contructor of the class.

You can break the cycle by making the bean factory method static:

@Bean
public static PasswordEncoder passwordEncoder() {
  return new BCryptPasswordEncoder();
}

This make it clear to Spring that the encoder does not depend on anything injected into the class instance.

How could this has cycle dependencies?

1 Answers1