Support for multiple java versions?

[lukaszstolarczuk]

I'm not sure if that's possible, but we should consider adding support for multiple versions of java (using toolchains? profiles? ...?).

possibly helpful links:

• https://dzone.com/articles/guide-for-supporting-multiple-versions-of-java-8-1
• http://maven.apache.org/guides/mini/guide-building-for-different-environments.html
• https://maven.apache.org/guides/introduction/introduction-to-profiles.html
• http://www.avajava.com/tutorials/lessons/how-do-i-activate-a-profile-based-on-a-particular-version-of-java.html

[lukaszstolarczuk]

perhaps we could drop the failOnWarning parameter in pom file, and enable it on CI on one selected java version; without this param it may just work like a charm