Spring @Bean 配置与构造函数注入

Question

While Executing below code, Spring Says "The dependencies of some of the beans in the application context form a cycle:"

@Configuration
public class Config {

    private final Object object1;

    public Config(@Qualifier("object1") Object object1) {
        this.object1 = object1;
    }

    @Bean
    @DependsOn("object1")
    public String getName() {
        return object1.toString();
    }

    @Bean(name = "object1")
    public Object getObject() {
       return new Object();
    }
}

Can anyone explain me, How this form a cycle ?

Answer 1

The Config class itself is a bean, which depends on your object1 bean, and which provides your object1 bean. (The error messages doesn't just say "some of the beans", you're getting a detailed list.)

tl;dr avoid injecting beans into configuration classes like this and make them @Bean method parameters instead.