Snippet

Advanced Bean Metadata Manipulation via BeanFactoryPostProcessor

The BeanFactoryPostProcessor allows you to intercept and modify bean definitions before the objects are even instantiated, enabling cross-cutting changes like scope overrides or dynamic property injection.

snippet.java

java

@Component
public class AuditMetadataProcessor implements BeanFactoryPostProcessor {
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
        for (String beanName : beanFactory.getBeanDefinitionNames()) {
            BeanDefinition bd = beanFactory.getBeanDefinition(beanName);
            if (bd.getBeanClassName() != null && bd.getBeanClassName().contains("Service")) {
                bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
            }
        }
    }
}

spring

Breakdown

implements BeanFactoryPostProcessor

Interface for modifying the application context's internal bean definitions.

postProcessBeanFactory(...)

Callback that runs after all bean definitions are loaded but before instantiation.

bd.setScope(BeanDefinition.SCOPE_PROTOTYPE)

Dynamically changing the lifecycle scope of specific beans at runtime.

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Advanced Bean Metadata Manipulation via BeanFactoryPostProcessor

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