Spring / Spring Boot
How ApplicationContext is initialized in Spring boot?
ApplicationContext is the core interface, represents the Spring IoC container and is responsible for instantiating, configuring, and assembling the beans. ApplicationContext is responsible for bean factory methods for accessing application components, loading file resources, internalization, etc.
In Spring Boot ApplicationContext is created once we execute the SpringApplication.run() command.Spring Boot returns the ConfigurableApplicationContext which extends ApplicationContext.
@SpringBootApplication public class SpringBootAdminApplication implements CommandLineRunner { @Autowired private ApplicationContext applicationContext; public static void main(String[] args) { new SpringApplicationBuilder() .bannerMode(Banner.Mode.OFF) .sources(SpringBootAdminApplication.class) .run(args); } public void run(String... args) throws Exception { System.out.println("Application Context disp name=" + applicationContext.getDisplayName()); System.out.println("ID=" + applicationContext.getId()); System.out.println("Application name=" + applicationContext.getApplicationName()); String myBean = (String) applicationContext.getBean("myName"); System.out.println(("myBean Value=" + myBean)); } @Bean String myName() { return "javapedia.net"; } }
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