We currently have provisional support for the IBM® J9 virtual machine for Java 7 but building narayana master now requires Java 8 (which we inherited from WildFly master which enforces Java 8).

Now it appears that the J9 virtual machine for Java 8 is not available on linux. When you go to the download page the linux download button redirects to the Oracle Hot Spot VM. We either need to abandon support for J9 or we add a CI machine running z/OS