Deploy runnable spring boot jar to Heroku

Question

I'm trying to get an executable Spring Boot jar to deploy on Heroku.

I have told Heroku to deploy from a github repository that contains only these files:

.
├── Procfile
└── current/
    └── <my application>.jar

My Procfile looks like this:

web: java $JAVA_OPTS -Dserver.port=$PORT -jar current/*.jar

This is the error I get in the Heroku build log when I try to deploy:

-----> Failed to detect app matching no buildpack
       More info: https://devcenter.heroku.com/articles/buildpacks#detection-
failure
 !     Push failed

If I look at the heroku/java build pack project in github, I can see that there's a script called detect that checks for the existence of a pom.xml file:

https://github.com/heroku/heroku-buildpack-java/blob/master/bin/detect

I believe my project isn't being deployed because I don't have a pom in the root directory.

Is it possible to just deploy a project that contains only an executable jar and a Procfile?

Answer 1

You'll want to use the JVM buildpack instead, which you can do by setting the heroku/jvm buildpack on the app instead of the heroku/java buildpack.

For example, you can run:

$ heroku buildpacks:set heroku/jvm

Or set it in the Heroku Dashboard's Settings tab for the app