I had some trouble with Java DnD. But now Drag and Drop works properly. (At least under Ubuntu).
Today I figured out, that TurboShredder doesn't properly works under Windows. Version 0.022 is adapted, so it shoud work under Windows. But it doesn't yet delete the files properly. They get securely overwritten, but Java can't remove them out of the filesystem. Somohow Drag 'n' Drop doesn't work at all with Windows. (Sometimes I fall almost in love with Ubuntu).
Additionally I went back to Java 6.