Why EAP6 is not able to parse the system properties in logging formatter via CLI ?

Issue

• While using a "system-property" in the "logging-output" via the "jboss-cli.sh" script as following it succeeds only when "${" occurs only once in the String value.

Example-1: Working Scenario.

cd /subsystem=logging/periodic-rotating-file-handler=FILE
:write-attribute(name=formatter, value="${jboss.node.name} %d{HH:mm:ss,SSS} %-5p [%c] (${jboss.node.name} %t) %s%E%n")

{"outcome" => "success"}

Example-2: Non-Working Scenario.

cd /subsystem=logging/periodic-rotating-file-handler=FILE
:write-attribute(name=formatter, value="%d{HH:mm:ss,SSS} %-5p [%c] (${jboss.node.name} %t) %s%E%n")
{
    "outcome" => "failed",
    "failure-description" => "JBAS014749: Operation handler failed: String index out of range: -15",
    "rolled-back" => true
}

• Since expressions are allowed in formatter, It is ideally expected that users can use "system-properties" everywhere in the "formatting-string".

• Why does it fail in EAP 6.2 ?

When I attach jconsole to the app server with the following configured for jboss logging

I get "java.lang.StringIndexOutOfBoundsException: String index out of range: -9"