Foo.java

@Component
public class Foo extends InstantiationAwareBeanPostProcessorAdapter implements BeanDefinitionRegistryPostProcessor {
    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry defRegistry) throws BeansException {
        DefaultListableBeanFactory registry = (DefaultListableBeanFactory) defRegistry;
        
        Map<String,JpaRepository> repos = registry.getBeansOfType(JpaRepository.class);
        // Repos is always empty :(
        Set<Class<?>> entities = new Reflections("com.example").getTypesAnnotatedWith(Entity.class);
        for(Class<?> entity : entities){
            boolean found = false;
            for(JpaRepository repo : repos.values()){
                Class<?> repoEntity = ResolvableType.forClass(repo.getClass()).getGeneric(0).resolve();
                if( entity.equals(repoEntity) ){
                    log.info("Match!");
                }
            }
        }
    }
}