Shouldn't be JDK 8 the default ?
Public JDK 7 is not receiving updates for 1 year - see http://www.oracle.com/technetwork/java/eol-135779.html or http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
Last release was April 2015

Is it really necessary to support RESTEasy with JDK7?
For WF10: Java 7 support has been discontinued allowing for deeper integration with the Java 8 runtime.

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Alessio Soldano
Web Service Lead, JBoss