Introduction

Deploying a Spring Boot 3.1 application on Heroku with Tomcat 10.1 might seem tricky at first, but with the right steps, you can get your application running smoothly on a cloud-based platform. In this guide, we’ll walk through the entire process, ensuring a seamless deployment.

Why Deploy Spring Boot on Heroku?

Heroku provides a simple and scalable cloud platform for deploying applications. Some key advantages include:

• Free tier available: Great for development and testing.
• Simplified deployment: Just push your code to Git, and Heroku handles the rest.
• Scalability: Scale your application with ease as traffic grows.
• Built-in support for Java: Heroku natively supports Java, making it easier to deploy Spring Boot apps.

Step 1: Prepare Your Spring Boot Application

Before deploying, ensure that your Spring Boot 3.1 application meets these requirements:

• Uses Tomcat 10.1 as the embedded server.
• Configured with PostgreSQL or any other database compatible with Heroku.
• Includes a Procfile for Heroku execution.

Add Dependencies

Update your pom.xml with the necessary dependencies for Spring Boot and Tomcat:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>10.1.0</version>
</dependency>

Step 2: Configure Heroku for Deployment

1. Install the Heroku CLI

If you haven’t already, install the Heroku CLI:

curl https://cli-assets.heroku.com/install.sh | sh

2. Login to Heroku

Run the following command:

heroku login

This opens a browser window for authentication.

3. Create a New Heroku App

In your project root directory, initialize a new Heroku app:

heroku create your-app-name

Replace your-app-name with a unique name.

Step 3: Configure the Procfile

Heroku requires a Procfile to specify the process type. Create a file named Procfile in your project root and add:

web: java -jar target/your-app.jar

Replace your-app.jar with the actual name of your built JAR file.

Step 4: Configure Application Properties

Heroku provides environment variables for configurations. Update your application.properties or application.yml:

server.port=${PORT}
spring.datasource.url=${JDBC_DATABASE_URL}
spring.datasource.username=${JDBC_DATABASE_USERNAME}
spring.datasource.password=${JDBC_DATABASE_PASSWORD}

Step 5: Deploy to Heroku

1. Initialize Git

If your project is not already a Git repository, initialize it:

git init
git add .
git commit -m "Initial commit"

2. Deploy to Heroku

git push heroku main

After deployment, Heroku assigns a URL to your app. You can check the status with:

heroku logs --tail

3. Scale the App

Heroku automatically assigns a free-tier dyno to your application. If needed, scale it:

heroku ps:scale web=1

Step 6: Open Your Application

Once deployed, open your application in a browser:

heroku open

This should load your Spring Boot 3.1 application running on Tomcat 10.1!

Conclusion

Deploying a Spring Boot 3.1 application on Heroku with Tomcat 10.1 is straightforward. By following these steps, you can leverage Heroku’s cloud infrastructure to run your applications efficiently with minimal setup.

🚀 Next Steps: Explore Heroku’s PostgreSQL integration, auto-scaling, and log monitoring for a more robust deployment!

Got questions or need help? Drop a comment below and let's discuss! 🚀