RESTEasy uses cdi-api 1.1 (or 1.0) which is not in sync with cdi-api 1.2 used in EAP.

RESTEasy pom files:

• https://github.com/resteasy/Resteasy/blob/master/jaxrs/pom.xml#L39
• https://github.com/resteasy/Resteasy/blob/master/jaxrs/resteasy-cdi/pom.xml#L27
• https://github.com/resteasy/Resteasy/blob/master/jaxrs/providers/resteasy-validator-provider-11/pom.xml#L72

EAP contains cdi-api 1.2:

• ${EAP_HOME}/modules/system/layers/base/javax/enterprise/api/main/cdi-api-1.2.0.redhat-2.jar