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javajava-11ktordokku

How to properly change Java Runtime on Dokku app container?

I'm running a Ktor backend app inside of a Dokku container on a server. It seems that by default Java8 is used. How can I properly change Java Runtime on dokku container to be Java 11?

I'm not sure if I should enter the dokku app container and update the Java, or is there some configuration available that I can use either on the dokku or my Ktor project side, or something else.

Solution

  • If deploying via the official heroku buildpack for java, you can specify a java.runtime.version in your system.properties as documented here.

    example:

    java.runtime.version=11