Well, you could depend on icedtea-java7-jre | sun-java6-jre | sun-java5-jre | sablevm | gij
Since both the Sun library and GNU Classpath have Swing. I don't like it (why should libraries depend on anything but java-common?), but policy is policy. (Icedtea is not in Debian yet, but it is in Ubuntu and that's what I'm using to build woodstox and freecol.)
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