CODEWITHSUNDEEP
javaspring-mvcweb-applicationsauthentication
Sebin Thomas
Sebin Thomas

Reputation: 289

How to configure your application on first run?

I am confused here, and I don't know whether I am asking a foolish question. The scenario is this, I have created an application in Development Environment and I want to deploy the application in Production therefore I emptied all the tables in the Database including the User. I don't have a registration page where I can add users. The Registration is done by the Administrator. As I Truncated the tables of users I don't have an administrator too. But at first run I need to create a Super Admin who can add users and configure the application.

  1. We can do it in a way that when the application runs for the first time we can check whether the table is empty and if it is write a logic to create a user and login with the user details.

Is there any other logic for this Issue? Please correct me if I am doing it in a wrong way. I use Spring MVC and Hibernate for the development.

Upvotes: 1

Views: 656

Answers (2)

Luca Taccagni
Luca Taccagni

Reputation: 1059

Get access to the module where you have your application bootstrap, then register manually a super-user(admin) on the DB table.

Remember that you'll have to set a control if it already exists or you'll fill the table very fast ;) If you want, you could simply call a function that verify if the table is empty: if it is, just ask username and pw (if you register in this way an user), and just register the first user as super-user.

Upvotes: 2

Gippy Aulakh
Gippy Aulakh

Reputation: 102

Yes you can do this by implementing WebApplication initialiser.

Add the following class to your project

public class SpringDispatcherConfig implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext container) {
        // Create the 'root' Spring application context
        AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
        rootContext.register(ApplicationConfig.class);

        // Manage the lifecycle of the root application context
        container.addListener(new ContextLoaderListener(rootContext));

        // Create the dispatcher servlet's Spring application context
        AnnotationConfigWebApplicationContext dispatcherContext = new AnnotationConfigWebApplicationContext();
        dispatcherContext.register(ApplicationConfig.class);

        // Register and map the dispatcher servlet
        ServletRegistration.Dynamic dispatcher = container.addServlet("SpringDispatcher", new DispatcherServlet(dispatcherContext));
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/*");
    }

}

And then you need ApplicationEventListnerClass and annotated method gets triggered on application start where you can implement functionality to create user

@Component
public class ApplicationStartListener {


    @EventListener
    public void handleContextRefresh(ContextRefreshedEvent event) {

        String id = event.getApplicationContext().getId();
        if (id.startsWith("org.springframework.web.context.WebApplicationContext:") && !id.endsWith("SpringDispatcher")) {
            //implement your on startup functionality here

        }
    }
}

Upvotes: 1

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