It is not listed in supported JDK, see Technical Requirements but Java 8 is generally supported and OpenJDK should work fine but if possible you should move to the officially supported JDK

I think this article is not for AEM 6. Please follow this tutorial https://helpx.adobe.com/experience-manager/kt/platform-repository/using/oak-run-index-technical-video-use.html as gauravb10066713gauravb10066713 suggests you need to use oak-run with the same version as you oak-core version (you can ...