Small Java Code Editor in Groovy + SwingBuilder

gistfile1.groovy

@Grab(group='net.sf.jedit-syntax', module='jedit-syntax', version='2.2.2')
import org.syntax.jedit.JEditTextArea
import org.syntax.jedit.tokenmarker.*
import groovy.swing.SwingBuilder

def mpanel
def editor

new SwingBuilder().edt {
  frame(title:'Editor', pack: true, show: true, locationRelativeTo: null) {
    borderLayout()
    lookAndFeel('system')
    mpanel = panel ()
    mpanel.add(editor = new JEditTextArea())
    editor.setTokenMarker(new JavaTokenMarker());
  }
}