The following program exhibits problems which seem to be typical for drag and drop in Java swing apps under Notion:
http://docs.oracle.com/javase/tutorial/uiswing/examples/dnd/BasicDnDProject/src/dnd/BasicDnD.java
Build instructions: Install a suitable JDK, run "$ javac BasicDnD.java", copy the resulting *.class files into a subdirectory called "dnd" and run "$ java dnd.BasicDnD".
You should be able to drag and drop elements between the different fields on the right (after checking the "Turn on Drag and Drop" box), but it doesn't work at all.