You will have to include your main jar as well:
main.class=my.main.class
classpath.1=MyApp.jar
classpath.2=lib/MyLib.jar
splash.image=SplashScreen.gif
or to simply include all jars:
main.class=my.main.class
classpath.1=*.jar
classpath.2=lib/*.jar
splash.image=SplashScreen.gif