1. Clone deltaspike repo:

git clone https://git-wip-us.apache.org/repos/asf/deltaspike.git

2. Import deltaspike/examples as an existing Maven project into JBT.
3. Open /deltaspike-jsf-playground/src/main/java/org/apache/deltaspike/playground/PlaygroundJsfModuleConfig.java with Java Editor
4. There is a validation error:
Managed bean class annotated @Specializes must directly extend the bean class of another managed bean [JSR-299 §3.1.4]

This error probably is a bug of CDI tools. We need to investigate it.