Exception in thread "main" java.lang.IllegalStateException: failed to start
	at com.acme.App.start(App.java:21)
	at com.acme.App.main(App.java:10)
Caused by: java.lang.NullPointerException: Cannot invoke "String.length()" because "name" is null
	at com.acme.Config.validate(Config.java:42)
	at com.acme.App.start(App.java:19)
	... 1 more
