Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch - Heroku

Question

I am trying to deploy my server on heroku. I got this error:

Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
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Answer 1

Simple solution:

web: java -Dserver.port=$PORT $JAVA_OPTS -jar target/myapi-1.0.0.jar

Replace myapi-1.0.0 with the name of your jar or use *

Note: The order of the variables matter. For example: the following doesn't work.

web: java $JAVA_OPTS -Dserver.port=$PORT -jar target/myapi-1.0.0.jar