Operator phase 2 EAP7-1337 extends WildFlyServer CRD with applicationSource spec.

According to analysis, one of these must be specifed:

• applicationImage
• applicationSource

However, creating CR without any of these passes, without any validation error or log for end user, but such operator is then useless.
I am using wildfly-operator image build from latest https://github.com/wildfly/wildfly-operator/pull/132

# given you have WildFlyServer CRD already installed on cluster
cat > demo.yaml << EOF
apiVersion: wildfly.org/v1alpha1
kind: WildFlyServer
metadata:
  name: demo-should-fail
spec:
  replicas: 1
EOF

oc create -f demo.yaml