START with JDK 1.6+
This application uses
javax.imageio.ImageIO class for saving images
in PNG format and
java.beans.XMLEncoder class for saving configuration settings,
which are available since JDK 1.4.0. It also uses SwingWorker class, which is available since
JDK 1.6.0. So this JNLP (Java Network Launching Protocol) file asks specifically for JDK version 1.6.