[standalone@localhost:9999 /] /subsystem=undertow/configuration=filter:read-resource
{
    "outcome" => "failed",
    "failure-description" => "JBAS014807: Management resource '[
    (\"subsystem\" => \"undertow\"),
    (\"configuration\" => \"filter\")
]' not found",
    "rolled-back" => true,
    "response-headers" => {"process-state" => "reload-required"}
}

[standalone@localhost:9999 /] /subsystem=undertow/configuration=error-handler:read-resource
{
    "outcome" => "failed",
    "failure-description" => "JBAS014807: Management resource '[
    (\"subsystem\" => \"undertow\"),
    (\"configuration\" => \"error-handler\")
]' not found",
    "rolled-back" => true,
    "response-headers" => {"process-state" => "reload-required"}
}