The latest version of yui-compressor does not have this problem. It is
easy enough to install manually from
sudo mv yuicompressor-2.4.8.jar /usr/share/yui-compressor/yui-compressor.jar
Perhaps the debian package maintainer could install version 2.4.8
instead of whatever version currently gets installed.
This is the maintainer address of Debian's Java team
debian-j...@lists.debian.org for discussions and questions.