advancedSpring Internals — Bean Lifecycle & Proxies
Why does declaring a BeanFactoryPostProcessor as a non-static @Bean sometimes break @Value placeholder injection?
BeanFactoryPostProcessors must be instantiated very early, before normal bean instantiation and before @Value placeholders are resolved. A non-static @Bean method inside a @Configuration class can force that configuration class itself to be instantiated too early, before property sources are fully set up.
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