`ports clean all' warning: No value for java JAVA_HOME was automatically discovered

[j. van den hoff]

I found only one (seemingly unanswered post in the archive: does somebody  
now where this warning comes from in the
`ports clean all' process (observed under 10.9.2)? more importantly: are  
they relevant?

e.g., one instance happens here:

...
--->  Cleaning jump
Warning: No value for java JAVA_HOME was automatically discovered
--->  Cleaning junit
...

I only see a handful of these warnings during the `clean all' run but  
still ...

j.

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