Spring Boot: Heroku

Running Spring Boot Applications On Heroku

To run a Spring Boot application on Heroku:

If you are using the heroku-maven-plugin be sure that the <web> element includes setting the port number to the one that Heroku wants the application to run on. In the example below, jar-file-name-1.0 is just an example. It should actually match the name of the jar file created by your pom.xml. It’s the --server.port=$PORT that you are more likely to be missing.
```
<processTypes>
         <web>java $JAVA_OPTS -jar target/jar-file-name-1.0.jar --server.port=$PORT</web>
</processTypes>
```
Similarly, if you are using the Procfile to start up the application by automatically deploying a branch from the Heroku dashboard, then you’ll need to be sure the Profile contains the --server.port=$PORT flag, e.g.

See also

Heroku’s Documentation for Spring Boot: https://devcenter.heroku.com/articles/deploying-spring-boot-apps-to-heroku
DZone documentation for Spring Boot on Heroku: https://dzone.com/articles/spring-boot-heroku-and-cicd

More on Spring Boot: Heroku

Spring Boot: Ajax—Communicating between front-end JavaScript and backend Java using XMLHTTP requests
Spring Boot: Annotations—The various things starting with @ that are particular to Spring and Spring Boot
Spring Boot: Command Line—A Command Line program within the Spring Boot framework
Spring Boot: Configuration—The src/resources/application.yml file, and how to fix 'Could not resolve placeholder ${salt}' type errors
Spring Boot: Controllers—The component where you map routes to the model and view
Spring Boot: Example Projects—Links to various Spring Boot Projects of interest
Spring Boot: Heroku—Running Spring Boot Applications On Heroku
Spring Boot: HTTPS—Enabling HTTPS
Spring Boot: Logging—How to handle logging in Spring Boot
Spring Boot: main—What the main program looks like in a Spring Boot Application
Spring Boot: OAuth—Social login with Spring Boot
Spring Boot: Starter Parent—What does the `parent` section in the pom.xml do?