Springboot application how to make welcomecontroller return pages from second module

[John Herrington]

I have a welcomeController first module which returns index.html. I want to create a second module which will be another html page like contact or about us. I want the second module to be able independently work without the first module (ex: it is as if developer is working on a separate module so it'll have code coverage and unit tests). But I also should be able to create a combined app which includes both first module and second module.

How can I make welcomeController return contact page or about us page from second module but if second module isn't ready or accessible then first module should just compile without any errors.

I can create another module but I'm not sure how I can make this work together.

welcomeController.java

package sample.multimodule.web;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class WelcomeController {
	private final Logger logger =  LoggerFactory.getLogger(this.getClass());
	
	@RequestMapping("/")
	public String welcome(Model model) {
		logger.info("Processing index request");
		model.addAttribute("course", "DevOps");
		return "index";
	}
}

ServletInitializer.java

package sample.multimodule;

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

public class ServletInitializer extends SpringBootServletInitializer {

	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(DevopsApplication.class);
	}

}

DevopsApplication.java

package sample.multimodule;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class DevopsApplication {

	public static void main(String[] args) {
		SpringApplication.run(DevopsApplication.class, args);
	}

}

SpringBootServletInitializer.java

package org.springframework.boot.web.servlet.support;

import org.springframework.boot.builder.SpringApplicationBuilder;

public class SpringBootServletInitializer {

	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		// TODO Auto-generated method stub
		return null;
	}

}

screenshot https://imgur.com/a/ik4LhgP