Vfrdtyky

My code used to works well before I upgraded spring-boot-starter-parent from 1.0.2.RELEASE to 2.1.0.RELEASE.

When the version of spring-boot-starter-parent is 1.0.2.RELEASE, I could deploy this project to tomcat, run tomcat, and when I type localhost:8080/greeting.html on my browser I could see 'Hello World".

But after I upgrade the version to 2.1.0.RELEASE and do the same thing, I just got a 404 not found error.

QUESTION: How can I fix this problem with version 2.1.0.RELEASE of spring-boot-starter-parent?

Here is my code snippet and the pom file:

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>



    <groupId>com.pluralsight</groupId>

    <artifactId>event-tracker</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>war</packaging>



    <name>event-tracker</name>

    <description>An app to track our Events</description>



    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.0.RELEASE</version>

        <!--<version>1.0.2.RELEASE</version>-->

        <relativePath/> <!-- lookup parent from repository -->

    </parent>



    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>



    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>



        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>



        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-tomcat</artifactId>

            <scope>provided</scope>

        </dependency>

    </dependencies>



    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>





</project>

WebConfig:

package com.pluralsight;



import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.servlet.config.annotation.EnableWebMvc;



@Configuration

@EnableWebMvc

@ComponentScan(basePackages = "com.pluralsight")

public class WebConfig {

}

WebAppInitializer:

package com.pluralsight;



import javax.servlet.ServletContext;

import javax.servlet.ServletRegistration;



import org.springframework.web.WebApplicationInitializer;

import org.springframework.web.context.ContextLoaderListener;

import org.springframework.web.context.WebApplicationContext;

import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;

import org.springframework.web.servlet.DispatcherServlet;



public class WebAppInitializer implements WebApplicationInitializer {



    @Override

    public void onStartup(ServletContext servletContext) {

        WebApplicationContext context = getContext();

        servletContext.addListener(new ContextLoaderListener(context));

        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("DispatcherServlet", new DispatcherServlet(context));

        dispatcher.setLoadOnStartup(1);

        dispatcher.addMapping("*.html");

    }



    private AnnotationConfigWebApplicationContext getContext() {

        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();

        context.setConfigLocation("com.pluralsight.WebConfig");

        return context;

    }

}

HelloController:

package com.pluralsight.controller;



import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;



@Controller

public class HelloController {



    @RequestMapping(value = "/greeting")

    public String sayHello(Model model) {

        model.addAttribute("greeting", "Hello World");



        return "hello.jsp";

    }

}

You can follow this link

Instead of WebAppInitializer class write Application class as in above link and declare start-class tag in properties.

It should work.