Here is a working example on GIT showing how to embed SWT in a traditional Swing JPanel:
https://gist.github.com/caprica/6890618 (Text version: here)
The trick is to create a java.awt.Canvas
linked to an SWT shell. This canvas can be added to any tradionnal Swing component. The SWT shell loop is managed by a separate thread.
Here is a screenshot on my Windows 7 box with Java 7: