Disallow Bean Definition Overriding?

Question

I want to disallow bean definition overriding in a SpringApplication. In other words, I want the effect of invoking GenericApplicationContext.setAllowBean

Answer 1

I have come across similar issue but not in spring boot application but in normal spring-mvc application which is having xml based configurations, so this solution might help people looking for other than spring-boot apps,

DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
    beanFactory.setAllowBeanDefinitionOverriding(false);
    new XmlBeanDefinitionReader(beanFactory).loadBeanDefinitions(new ClassPathResource("spring-first.xml"));

Answer 2

Well, you can achieve it with some Boot features and context customization:

@EnableAutoConfiguration
public class MyApp {

    public static void main(String[] args) throws InterruptedException {
        ConfigurableApplicationContext ctx = new SpringApplicationBuilder(MyApp.class)
                .initializers(new ApplicationContextInitializer<GenericApplicationContext>() {
                    @Override
                    public void initialize(GenericApplicationContext applicationContext) {
                        applicationContext.setAllowBeanDefinitionOverriding(false);
                    }
                }).run(args);
    }

}

All other info you can find from source code and JavaDocs of mentioned classes.