In Picketlink IDM subsystem the operations write-attribute and undefine-attribute in CLI don't work and they fail with exception: { "outcome" => "failed", "failure-description" => "JBAS014750: Operation handler failed to complete", "rolled-back" => true } This issue was introduced in EAP 6.4.0.DR6 and does not occur in previous versions.
https://github.com/jbossas/jboss-eap/pull/1845
Verified in EAP 6.4.0.DR7