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Make sure he has installed an own java version:
https://www.java.com/en/download/manual.jsp
If he has already Java installed and it is not working, then run jarfix
https://johann.loefflmann.net/en/software/jarfix/index.html
Make sure he has installed an own java version:
https://www.java.com/en/download/manual.jsp
If he has already Java installed and it is not working, then run jarfix
https://johann.loefflmann.net/en/software/jarfix/index.html