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[RaiMan <question160893@xxxxxxxxxxxxxxxxxxxxx>]

Question #160893 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/160893

RaiMan posted a new comment:
as far as I understand:

-- bar=foo() 
- makes the foo object and creates the instance variables

-- bar.main()
- the existing instance variables of foo are used and 
- the newly created region reference (region.exists(img)) overwrites the old one
- the old region reference should be eligible for garbage collection
- no need to do anything from your side

BTW: 
-- immutable as such has nothing to do with garbage collection. it only means, that an object cannot be changed in place. "Changing" immutables always means creating a new object.

--- java command line options
-- there seem to be (besides the heap options -Xms/-Xmx) some more options to influence the internal usage of the heap related to GC. 

-- some logging can be ordered (not tested ;-)
   -verbose:gc # gc info displayed
   -Xloggc:file # gc info written to file

-- this is a nice article on Java GC
http://javarevisited.blogspot.com/2011/04/garbage-collection-in-java.html#.Tfr7-M3Qbw8

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