Tell Spring not to invoke shutdown on beans of a specific type

Question

On application close, each singleton bean is destroyed by DefaultListableBeanFactory.destroySingletons(). If the bean has a public void no-arg method called shutdown, then it will be invoked. I have some 3rd party beans, all of which implement a certain interface, let's call it DoNotDestroy, that I do not want Spring to destroy.

I can specify a blank string destroy method on each bean, like so:

@Bean(destroyMethod = "")
public MyBean myBean() {
    return new MyBean();
}

However, I would prefer to somehow configure Spring to not destroy any beans that implement DoNotDestroy. Is there a good way to do this?

whistling_marmot · Accepted Answer · 2021-01-21T17:45:16.033

Rather than blanking out the destroy method in each @Bean method, I can implement a BeanFactoryPostProcessor to do the same thing:

@Component
public class DoNotDestroyPostProcessor implements BeanFactoryPostProcessor {

    private final Logger log = LoggerFactory.getLogger(DoNotDestroyPostProcessor.class);

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        String[] doNotDestroys = beanFactory.getBeanNamesForType(DoNotDestroy.class);
        for (String doNotDestroy : doNotDestroys) {
            BeanDefinition bean = beanFactory.getBeanDefinition(doNotDestroy);
            log.info("Don't destroy bean {} {}", bean.getFactoryMethodName(), bean.getDestroyMethodName());
            bean.setDestroyMethodName("");
        }
    }
}

This avoids the problem of someone adding a bean and forgetting to blank out the destroy method.

Tell Spring not to invoke shutdown on beans of a specific type

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