Default dockerBaseImage value should be set to Java 8.

[wjlow]

Expected behaviour

Not setting dockerBaseImage should default to some version of Java 8, which is the most recent Java version that is supported by Scala.

Actual behaviour

dockerBaseImage is set to openjdk:latest, the latest tag changed from 8 to 10 recently. This can cause problems in Scala apps.

Information

• What sbt-native-packager are you using: 1.3.6
• What sbt version: 1.1.1
• What is your build system (e.g. Ubuntu, MacOS, Windows, Debian ): MacOS
• What package are you building (e.g. docker, rpm, ...): docker
• What version has your build tool (find out with e.g. rpm --version): 18.03.0-ce
• What is your target system (e.g. Ubuntu 16.04, CentOS 7): Not sure

[muuki88]

Thanks for your detailed report 👍

Would you mind fixing this? This sounds like a reasonable suggestestion. IIRC there maybe something like openjdk:java8-latest?

[wjlow]

Yup, openjdk:8 should give the latest Java 8.

I can try and raise a PR!

[wjlow]

Raised #1147