GitHub user Chih80 added a comment to the discussion: upgraded to 4.22  - unset 
environment variable evaluates to an empty string for java debug

> @Chih80 , I do not see the problem here. any shell will return an empty 
> string for an variable that isn’t set, would they? I think this is not even 
> something new in cloudstack, but rather in the systemd implementation. If it 
> would not report it before and it does now that is, because the start scripts 
> have always handled JAVA_DEBUG in this way; just blindly adding them to the 
> command line counting on it being evaluated as an empty string if not set.

I thought so too. Thank You.

GitHub link: 
https://github.com/apache/cloudstack/discussions/12220#discussioncomment-15222731

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