You must create a timer class instance to use the timer's functions. Add the following code to the Java file:timer = new Timer (countdown, this);Notice the "countdown" variable is used.

The Java platform’s tool support for creating external DSLs is pretty strong, however. You’ve walked through the steps of building an external DSL using openArchitectureWare and Xtext.

It is probably safe to assume that the majority of people who use JAXB today use the xjc compiler to create Java classes from XML Schema files rather than from Document Type Definition ( DTD ) files.