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[Source] Spring Boot looks at all registered BEANs

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Posted on 3/23/2022 9:45:28 AM | | | |
In spring boot, @Component, @Repository, @Controller, @Service, @Configration annotations convert the object you want to instantiate into a bean and put it in an IoC container, so you can say that everything is a BEAN.

When we need to use an object, we can get the BEAN from the IOC container by constructor injection or by using @Autowired annotations. When we get a BEAN that has not been injected, we may get an error when starting the project. Sometimes when a BEAN is obtained dynamically, no error will be reported when starting, but an error may be reported when running. So, getting to see all registered BEAs is very helpful for us to troubleshoot problems.

The help class code for dynamically obtaining BEAN in a spring container is as follows:

View all registered BEAN codes as follows:

The renderings are as follows:







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