Deploying a Vaadin Application to Heroku
This tutorial shows you how to deploy a Vaadin application to the Heroku cloud platform. Heroku has a free-tier offering that can be used for non-commercial applications. You can find details of their free offerings on the Heroku website.
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Note
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Heroku account required
To complete this tutorial, you need a Heroku account.
You can sign up at https://signup.heroku.com/.
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Step 1: Install and Set Up the Heroku CLI
To begin, download and install the Heroku CLI.
When it has been installed, log in to your account from a terminal window using the following command:
heroku loginNext, install Heroku’s Java plugin by issuing the following command:
heroku plugins:install javaStep 2: Download a Starter App
Download a minimal Vaadin project and unpack the downloaded zip into a folder on your computer.
Step 3: Add Java 11 Support
The starter project is on Java 11, whereas, by default, Heroku expects Java 8 projects.
To ensure that Heroku runs a Java 11 environment, create a system.properties file under the project root directory with the following content:
java.runtime.version=11If this doesn’t work, you can specify the Java version as a parameter when you run the deploy command (see Step 6: Deploy the Application):
heroku deploy:jar --jdk=11 ...Step 4: Create a Production Build
Open the project directory from a terminal window, and enter the following command to generate a JAR file of your application:
mvn package -PproductionStep 5: Initialize a Heroku Application
From a terminal window, enter the following command to initialize a Heroku application:
heroku create --no-remoteThis command creates an application with a randomly generated name.
Take a note of the generated application name that appears in the logs.
For example, in the following screenshot, the generated application name is blooming-beach-34155.
Step 6: Deploy the Application
To deploy the application, run the following command from a terminal in your project’s root directory (replacing 'blooming-beach-34155' in the command with your application name, noted in the previous step):
heroku deploy:jar target/myapp-1.0-SNAPSHOT.jar --app blooming-beach-34155When the deployment has completed, the application URL is displayed in the logs.