gistfile1.java

public class Application extends Controller {

    static Form<TestData> form = Form.form(TestData.class);

    public static Result index() {
        return ok(index.render(form));
    }

    public static Result submit() {
        Form<TestData> filledForm = form.bindFromRequest(); //bindFromRequest returns "a copy of this form filled with the new data"
        if (filledForm.hasErrors()) {
            Logger.error("YES YOU HAVE ERRORS");
            return badRequest(index.render(filledForm)); //show the form with the data
        }
        Logger.debug("Age:"+testData.age);
        return ok(index.render(form));
    }


}

You'll need to do:

TestData testData = filledForm.get();

After the if statement.