What problem/issue/behavior are you having trouble with? What do you expect to see?

It is possible to define the following without JBoss complaining:

<subsystem xmlns="urn:jboss:domain:security:3.0">
<security-domain name="iskv21c" cache-type="Hugo">
[...]

Expected behavior is that JBoss complains about invalid value "Hugo" (e.g. throws an Exception, refuses to start,..)

According to the CLI, there are two valid options: default and infinispan

}
-----------------------
[standalone@localhost:9990 /] /subsystem=security/security-domain=other:read-resource-description
.. .. ..
.. .. ..
"attributes" => {"cache-type" => {
"type" => STRING,
"description" => "Adds a cache to speed up authentication checks. Allowed values are 'default' to use simple map as the cache and 'infinispan' to use an Infinispan cache.",
"expressions-allowed" => true,
"required" => false,
"nillable" => true,
"min-length" => 1L,
"max-length" => 2147483647L,
"allowed" => [
"default",
"infinispan"
],
"access-type" => "read-write",
"storage" => "configuration",
"restart-required" => "no-services"
}},
-----------------------