Could you try to expand your Java Project view, wait for it showing the content, and then trigger the export jar command again? I guess it's because the extension is not activated so the command is ...

If the Java application is missing from the Windows Control Panel, you can follow our detailed post to restore the Java settings console.

If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.

Java is a very extensively used programming language. In this article, we explain how you can run Java programs from the Command Prompt.

There seems to be a problem with the alpine images. At least there is for me. I also tried the deprecated java:8-jre-alpine image and got the same result. Dockerfile: FROM openjdk:8-jre-alpine ARG ...