Setup
Specify jar source in Procfile.
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web: java -Dserver.port=$PORT $JAVA_OPTS -jar target/demo-0.0.1-SNAPSHOT.jar
Deploy
Deployment automatically starts with Heroku CLI with the following command:
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git add .
git commit "message"
git push heroku master
Errors in initial build
Invalid target release
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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:compile (default-compile) on project demo: Fatal error compiling: invalid target release: 17 -> [Help 1]
Solution
Add matching java version to force the version in system.properties in root.
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java.runtime.version=17
Success
