GitHub user DaanHoogland 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.

GitHub link: 
https://github.com/apache/cloudstack/discussions/12220#discussioncomment-15216769

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