[FIXED] Basic SpringMVC + Tomcat issue

Issue

I am very new to SpringMVC, and right now I am trying to build a simple application using this tutorial: http://websystique.com/springmvc/spring-4-mvc-helloworld-tutorial-annotation-javaconfig-full-example/ I have checked Basic SpringMvC controller not working and it does not seem to be my problem, my app is unavailable even when I insert the app name. I use annotation-based config and Tomcat 9.

I have three classes: MainController.java

package mvc_webapp.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/")
public class MainController {

@RequestMapping(method = RequestMethod.GET)
public String sayHello() {
    return "index";
}

@RequestMapping(value = "/index", method = RequestMethod.GET)
public String indexPage() {
    return "index";
}
}

BlogConfiguration.java

package mvc_webapp.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "mvc_webapp")
public class BlogConfiguration {
    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setViewClass(JstlView.class);
        viewResolver.setPrefix("WEB-INF/views/");
        viewResolver.setSuffix(".html");
        return viewResolver;
    }
   }

BlogInitializer.java

package mvc_webapp.configuration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class BlogInitializer implements WebApplicationInitializer {

public void onStartup(ServletContext servletContext) throws ServletException {
    AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
    ctx.register(BlogConfiguration.class);
    ctx.setServletContext(servletContext);

    ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx));
    servlet.setLoadOnStartup(1);
    servlet.addMapping("/");
}

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>net.atos</groupId>
  <artifactId>mvc_webapp</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>mvc_webapp Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
    <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>3.8.1</version>
  <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.0.8.RELEASE</version>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
    <scope>provided</scope>
</dependency>       
  </dependencies>
  <build>
    <pluginManagement>
        <plugins>
           <plugin>
                <groupId>org.apache.maven</groupId>
                <artifactId>maven-plugin-api</artifactId>
                <version>3.5.4</version>
                 <configuration>
                    <warSourceDirectory>src/main/webapp</warSourceDirectory>
                    <warName>mvc_webapp</warName>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
             </configuration>
        </plugin>
    </plugins>
</pluginManagement>
<finalName>mvc_webapp</finalName>

I more or less understand what these components are, but I cannot detect what exactly is wrong - content of the classes is only slightly different from the tutorial. Update: I added the screenshot with project issues, even though they did not seem to be relevant to me as neither compiler nor build tool issued any errors. Not to mention that pom.xml complains about the value which is not even there.

Solution

So, I ended up abandoning attempts to do it in eclipse, made a WebApp project in Netbeans and with significantly less problems managed to start an annotation-based project there. Thanks everyone for the contributions.

Answered By - vadim_v