how to configure 'dispatcherServlet' load on startup by spring boot?

Question

I use spring-boot-starter-parent as parent and add spring-boot-starter-web as denpendency.

By add the @SpringBootApplication annot

Answer 1

I encountered the same problem with loadOnStartup. I solved it by using a custom BeanFactoryPostProcessor to modify the BeanDefinition of the ServletRegistrationBean that Spring Boot creates for registering the DispatcherServlet.

The following code will set loadOnStartup for the DispatcherServlet in a Spring Boot app, when used within an @Configuration class:

@Bean
public static BeanFactoryPostProcessor beanFactoryPostProcessor() {
    return new BeanFactoryPostProcessor() {

        @Override
        public void postProcessBeanFactory(
                ConfigurableListableBeanFactory beanFactory) throws BeansException {
            BeanDefinition bean = beanFactory.getBeanDefinition(
                    DispatcherServletAutoConfiguration.DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);

            bean.getPropertyValues().add("loadOnStartup", 1);
        }
    };
}