gistfile1.groovy

def pickDirDialog = new JFileChooser(
  dialogTitle: "Choose directory for the new application",
  fileSelectionMode: JFileChooser.DIRECTORIES_ONLY,
  approveButtonText: "Set directory for new application",
  acceptAllFileFilterUsed: false
)

result = pickDirDialog.showSaveDialog()

if( result == JFileChooser.APPROVE_OPTION )
{
   newApplicationPath = pickDirDialog.getSelectedFile()
}
else
{
  throw new InvalidUserDataException( "You must choose the parent directory for the new application." )
}