https://issues.jboss.org/browse/RESTEASY-2062
https://issues.jboss.org/browse/WFLY-11651
https://issues.jboss.org/browse/WFCORE-4297

The changes implemented for the jiras above cause 2 resteasy integration tests to fail.
org.jboss.resteasy.test.resource.basic.MediaTypeFromMessageBodyWriterTest
org.jboss.resteasy.test.resource.param.FormParamTest

FormParamTest is in violation of the spec requirments in this area.
FormParamEntityThrowsIllegaArgumentException is designed to throw an exception.
This causes the app to fail deployment when the @DefaulValue is passed as a test.

MediaTypeFromMessageBodyWriterTest fails because RuntimeDelegate.getInstance
returns null during the deployment process.
MediaTypeFromMessageBodyWriterResource has @DefaultValue method parameter
type MediaType. This class has valueOf method which calls RuntimeDelegate. That
method returns null.
MediaType has valueOf(String) method
calls RuntimeDelegate.getInstance which returns null during deployment
process.