Rory, Looks like there is compiler regression in b42, that prevented wildfly-core from compiling Looks like that sub class doesn't import subclasses from interface that parent class implements. What is even more odd is that i can only reproduce this on few environments. Fix was simple https://github.com/ctomc/wildfly-core/commit/d29316a0c73fe74e587f4a8160a8... but this should probably be fixed given that it worked in JDK 6, 7 & 8 I can try to prepare simple case to reproduce if you guys think this is worth exploring.

After fix applied above, wildfly-core build & passes testsuite without any failures, http://teamcity.cafe-babe.org/viewLog.html?buildTypeId=WildFly_WildflyCor... -- tomaz On Tue, Dec 16, 2014 at 1:29 PM, Rory O'Donnell <rory.odonnell(a)oracle.com <mailto:rory.odonnell@oracle.com>> wrote: Hi Jason/Tomaz, Now that JDK 9 Early Access build images are modular [1], there is a fresh Early Access build for JDK 9 b42 <https://jdk9.java.net/download/> available on java.net <http://java.net>;. The summary of changes are listed here <http://www.java.net/download/jdk9/changes/jdk9-b42.html> In addition, there are new Early Access builds for the ongoing update releases. The Early Access build for JDK 8u40 b18 <http://jdk8.java.net/download.html> is available on java.net <http://java.net>;, with the summary of changes listed here. <http://www.java.net/download/jdk8u40/changes/jdk8u40-b18.html> Finally, the Early Access build for JDK 7u80 b03 <https://jdk7.java.net/download.html>is available on java.net <http://java.net>;, with the summary of changes listed here. <http://download.java.net/jdk7u80/changes/jdk7u80-b03.html> As we enter the later phases of development for JDK 7u80 & JDK 8u40, please log any show stoppers as soon as possible. Rgds,Rory [1] http://mreinhold.org/blog/jigsaw-modular-images -- Rgds,Rory O'Donnell Quality Engineering Manager Oracle EMEA , Dublin, Ireland