"outcome" => "failed",
"failure-description" => "WFLYJCA0045: failed to set attribute: null",
"rolled-back" => true
This is regression compared to EAP 7.0.0.GA as well as 7.1.0.DR12.
Attribute initial size in connector pool configuration must not have a default value
Not able to undefine initial-pool-size attribute of datasource