Is it possible to define BeanDefinition in Spring Boot during compilation?

In Spring Boot, BeanDefinition are usually created and processed at runtime using the auto-configuration mechanism and component scanning. However, starting with Spring Framework 5 and Spring Boot 2, there is an option to use Ahead-Of-Time (AOT) compilation to optimize application startup.

Nevertheless, standard BeanDefinition definition during compilation is not common practice. Typically, beans are defined through annotations (@Component, @Bean, etc.) and registered in the context during application startup.

If static registration of beans at compile time is required, code generation mechanisms or AOT compilation can be used, but these are more advanced techniques and are not the standard way to define BeanDefinition in Spring Boot.