Deploy Spring Boot Application on Tomcat Server
1. Objective of post
No ADS
In this post, I will guide you for implementing a Spring Boot application on Tomcat Server. One of the characteristics of the Tomcat is compact. The capacity of theTomcat is only about 10MB, and an open source Java Web Server.

Ensure that you have installed the Tomcat successfully. If not, you can refer to Tomcat installations as in the following post:
In fact, the Spring Boot application can be packaged into an Executable JAR file. With this file you can run the application directly without needing to deploy it on any Web Server. The Executable JAR file may not be compatible with all Web servers, therefore, you want to deploy it on a particular Web server, you need to package the Spring Boot application into a WAR file.
2. Edit code
No ADS
I have a Spring Boot project here, developed by Eclipse IDE. When creating the Spring Boot project, you have 2 choices to pack this project such as WAR or JAR.

When you create the Spring Boot project with the "Packaging = War" option, Eclipse will create 2 classes such as "AbcApplication & ServletInitializer" for you. The WAR files are suitable for being deployed on Web Servers.

While, if you create a Spring Boot project with the "Packaging = Jar" choice, only one AbcApplication class will be created. When the Spring Boot application is packed into the JAR file, it can be independently executabe without being deployed on any Web Server. But the JAR file is not suitable to be deployed on Web Servers.

WAR File.
If you have an available Spring Boot, you need to correct packaging method into WAR:
On the Eclipse, open the pom.xml file, and change packaging method into war.

If your project doesn't have a ServletInitializer class, create it.

ServletInitializer.java
package org.o7planning.example;
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(SpringBootTomcatApplication.class);
}
}
Add the following configuration snippet to the pom.xml:
** pom.xml **
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>

If there are more than one Application class in your project, please tell the Spring Boot which class will be used for your application.
** pom.xml **
<properties>
<start-class>org.o7planning.example.OtherSpringBootWebApplication</start-class>
</properties>
3. Install Spring Boot
No ADS
In the next step, you need to use Maven to create WAR file. You have to ensure that your Eclipse is using JDK instead of JRE. If not, en error will occur in this process.
Right click on the Project and select:
Run As/Maven Install

At this moment, you will have a WAR file in the target folder of the project, you can use this file to deploy on the Tomcat Server.

See also:
No ADS
Java Application Servers Tutorials
- Install Tomcat Server for Eclipse
- Install Tomcat Server
- Install Glassfish Web Server on Windows
- Install Oracle WebLogic Server
- How to create Windows Service for Oracle WebLogic Server?
- Deploy Spring Boot Application on Tomcat Server
- Deploy Spring Boot Application on Oracle WebLogic Server
- Deploy Spring MVC on Oracle WebLogic Server
- Install SSL Certificate for Tomcat Server
- Install a free SSL certificate Let's Encrypt for Tomcat Server on Ubuntu
Show More
Spring Boot Tutorials
- Spring Boot Restful Client with RestTemplate Example
- Deploy Spring Boot Application on Oracle WebLogic Server
- Use Multiple DataSources with Spring Boot and RoutingDataSource
- Create a User Registration Application with Spring Boot, Spring Form Validation
- Spring Boot, Hibernate and Spring Transaction Tutorial with Examples
- Spring Email Tutorial with Examples
- Spring Boot File Upload Example
- Spring Boot and Groovy Tutorial with Examples
- Spring Boot Common Properties
- Spring Boot and MongoDB Tutorial with Examples
- Spring Boot File Upload with jQuery Ajax Example
- Spring Boot, JPA and Spring Transaction Tutorial with Examples
- Spring Boot File Upload with AngularJS Example
- Run background scheduled tasks in Spring
- Spring Boot and FreeMarker Tutorial with Examples
- Use Logging in Spring Boot
- Spring Boot and Spring Data JPA Tutorial with Examples
- Secure Spring Boot RESTful Service using Auth0 JWT
- Spring Boot and JSP Tutorial with Examples
- Application Monitoring with Spring Boot Actuator
- Fetch data with Spring Data JPA DTO Projections
- Create a Multi Language web application with Spring Boot
- Configure Spring Boot to redirect HTTP to HTTPS
- Spring JDBC Tutorial with Examples
- Spring Boot File Download Example
- Spring Boot, Apache Tiles, JSP Tutorial with Examples
- Create a Login Application with Spring Boot, Spring Security, Spring JDBC
- Spring Boot Tutorial for Beginners
- Create a Login Application with Spring Boot, Spring Security, JPA
- Use Twitter Bootstrap in Spring Boot
- Spring Tutorial for Beginners
- Spring Boot Interceptors Tutorial with Examples
- Install Spring Tool Suite for Eclipse
- Create a Shopping Cart Web Application with Spring Boot, Hibernate
- Secure Spring Boot RESTful Service using Basic Authentication
- Spring Boot and Thymeleaf Tutorial with Examples
- Spring Boot and Mustache Tutorial with Examples
- Integrating Spring Boot, JPA and H2 Database
- CRUD Restful Web Service Example with Spring Boot
- Use Multiple DataSources with Spring Boot and JPA
- CRUD Example with Spring Boot, REST and AngularJS
- Install a free Let's Encrypt SSL certificate for Spring Boot
- Example of OAuth2 Social Login in Spring Boot
- Create a simple Chat application with Spring Boot and Websocket
- Use multiple ViewResolvers in Spring Boot
- Spring Boot, Spring JDBC and Spring Transaction Tutorial with Examples
- Deploy Spring Boot Application on Tomcat Server
Show More