I cannot create a decent SWT table, has somebody done that? My code looks like:
def subapp = jface.shell( window.getShell() ) {
  gridLayout(numColumns:3)
    
  table( toolTipText:"This is a table!", style:"multi, full_selection"
         , headerVisible:true
          ) {
//        gridData( style:"fill_both" )
         columns() {
             tableColumn(text:"Attribute", style:"center")
             tableColumn(text:"Value", style:"center")
             tableColumn(text:"Flag", style:"center")
         }
        items( [
            tableItem ( text:"root1" )
            , tableItem ( text:"root2" )
            , tableItem ( text:"root3" )
            , tableItem ( text:"root4" )
            ]
        )
    }
}
subapp.pack()
subapp.open()

I have not as of yet got a decent SWT table to work yet either, the SWT/JFace Builder for Groovy was horked from the Groovy SWT project that was begun, but never improved upon.  It is one of those things that I think could definitely use expounding on and some improvements.  So I think that I and others would appreciate hearing more about what you are learning.

Swing is also a challenge :( I am getting null pointer Exception with the following code
def swing = new SwingBuilder();
widget = swing.frame( title:'My Title', defaultCloseOperation:javax.swing.WindowConstants.EXIT_ON_CLOSE) {
    panel( layout:new BorderLayout() ) {
        splitPane( orientation:JSplitPane.VERTICAL_SPLIT, dividerLocation:24 ) {
            panel( layout:new BorderLayout() ) {
                label(text:'My Label', constraints:BorderLayout.WEST, toolTipText:'My Label')
            }
            panel() {
                button( text:'Exit',   actionPerformed:{ println("I am done - Exit"); System.exit(0) }, toolTipText:'Exit withoit doing anything' )
            }
        }
    }
}
widget.pack()
widget.show()