Cannot resolve system property when using referencing it using jboss-cli - jboss

Question

I am attempting to flush a JNDI datasource using the jboss-cli, but the datasource is defined using a ${jndi.prefix} variable, and the CLI can't seem to be able to resolve it.
Here is my datasource in standalone.xml:
<datasource jndi-name="${jndi.prefix}/CORE" pool-name="${jndi.prefix}/CORE_Pool" enabled="true" use-java-context="true" use-ccm="true">
<connection-url>jdbc:sqlserver://10.222.255.100;DatabaseName=CORE</connection-url>
<driver>sqlserver</driver>
<pool>
<min-pool-size>1</min-pool-size>
<max-pool-size>10</max-pool-size>
<prefill>true</prefill>
</pool>
<security>
<user-name>CORE_DBO</user-name>
<password>password</password>
</security>
</datasource>
and jndi.prefix is defined in system-properties:
<system-properties>
<property name="jndi.prefix" value="java:"/>
</system-properties>
I can see it using the CLI, but when trying to resolve it, I am told that it is unrecognized:
[standalone#localhost:9990 /] cd system-property
[standalone#localhost:9990 system-property] cd jndi.prefix
[standalone#localhost:9990 system-property=jndi.prefix] ls
value=java:
[standalone#localhost:9990 system-property=jndi.prefix] /subsystem=datasources/data-source=${jndi.prefix}\/CORE_Pool/:read-resource
Unrecognized system property jndi.prefix
I have tried swapping the ${jndi.prefix} in the datasource with the literal value java: and that worked, but we have tons of environments that would have to be updated, so I am not fond of that solution.
Why can't the CLI resolve this variable when it is clearly defined?

Answer 1

The system properties you can use in the CLI aren't the ones defined in your Wildfly configuration :
System property values used in management CLI commands must have already been defined in order to be resolved. You must either pass in a properties file (--properties=/path/to/file.properties) or property value pairs (-Dkey=value) when starting your management CLI instance. The properties file uses a standard KEY=VALUE syntax.
(source for EAP, but it's most probably the same for Wildfly)