Launching the application context with Java configuration

The following program shows how to launch a Java context; we use the main method to launch the application context using AnnotationConfigApplicationContext:

    public class LaunchJavaContext { 
      private static final User DUMMY_USER = new User("dummy"); 
      public static Logger logger =  
      Logger.getLogger(LaunchJavaContext.class); 
      public static void main(String[] args) { 
        ApplicationContext context = new 
        AnnotationConfigApplicationContext( 
        SpringContext.class); 
        BusinessService service = 
        context.getBean(BusinessService.class); 
        logger.debug(service.calculateSum(DUMMY_USER)); 
      } 
     }

The following lines of code create the application context. We want to create an application context based on the Java configuration. So, we use AnnotationConfigApplicationContext:

    ApplicationContext context = new 
    AnnotationConfigApplicationContext( 
      SpringContext.class);

Once the context is launched, we will need to get the business service bean. We use the getBean method that passes the type of the bean (BusinessService.class) as an argument:

    BusinessService service = context.getBean(BusinessService.class );

We are all set to launch the application context by running the LaunchJavaContext program.