with GROOVY-3642 applied

BoundSpinners.groovy

import groovy.swing.SwingBuilder
import groovy.beans.Bindable
 
@Bindable class Model {
  int intField
}
 
sb = new SwingBuilder()
model = new Model()
 
sb.frame(pack:true, show:true, defaultCloseOperation:javax.swing.JFrame.DISPOSE_ON_CLOSE) {
  vbox {
    hbox {
      label('Source Spinner:')
      spinner(value: bind(target:model, 'intField', value:50))
    }
    hbox {
      label('Target Spinner:')
      spinner(value: bind(source:model, 'intField'))
    }
  }
}