Issue #438 has been updated by Vicente J. Ruiz Jurado.

Should be fixed in 0.12 version (not yet available)
http://sourceforge.net/p/htmlunit/code/7813
http://mvnrepository.com/artifact/net.sourceforge.htmlunit/htmlunit

Defect #438: htmlunit generate tmp files that are not removed

http://www.julespotvin.com/?p=17
http://old.nabble.com/tmp-files-td31363960.html
http://sourceforge.net/p/htmlunit/bugs/1344/

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