NPE occurs when some class which takes optional argument is instantiated.

How to run

1. Compile Ceylon module using ceylon compile npewildflycdi
2. Assembly .war with ceylon war npewildflycdi -R webapp --static-metamodel
3. Run assembled .war with Wildfly
4. Open in web-browser http://127.0.0.1:8080/npewildflycdi-1.0.0