Trolltech has < http://www.trolltech.com/company/newsroom/announcements/press.2006-07-14.7914556269/ released > a technology preview of Jambi, which provides Java support for Qt. This could eventually make it possible for KDE developers to use Java. I hope Trolltech also considers adding .NET support at some point in the future. Unsurprisingly, Jambi is not yet compatible with GCJ/Classpath.