fix spring config

spring-mvc-email/pom.xml

@@ -21,16 +21,17 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-tomcat</artifactId>
+            <scope>provided</scope>
+        </dependency>        
         <!-- Spring Boot Starter Mail dependency -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-mail</artifactId>
-        </dependency>
+        </dependency>       
         <!-- The following two dependencies included to render jsp pages -->
-        <dependency>
-            <groupId>org.apache.tomcat.embed</groupId>
-            <artifactId>tomcat-embed-jasper</artifactId>
-        </dependency>
         <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>jstl</artifactId>

spring-mvc-email/src/main/java/com/baeldung/spring/Application.java

@@ -2,10 +2,11 @@ package com.baeldung.spring;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.support.SpringBootServletInitializer;
 
 
 @SpringBootApplication
-public class Application {
+public class Application extends SpringBootServletInitializer {
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);
     }