:read-attribute and :write-attribute Error in AS7

:read-attribute(name=xyz) and :write-attribute(name=xyz,value=zyx) do not work in console with JBoss AS7.1 nightly builds.

The expectation is that :read-attribute will return the current value of the property or the default value if the property has not been set. For :write-attribute the expectation is that all the properties listed in :read-resource-description can be set.

The JBoss was started with the following command:
bin/standalone.sh --server-config=standalone-ha.xml

Here is the current output for invoking the two operations use the advertise attribute as an example. The outcome of both operations is failed.

[standalone@localhost:9999 subsystem=modcluster] :read-attribute(name=advertise)
{
"outcome" => "failed",
"failure-description" => "No known attribute advertise",
"rolled-back" => true
}

[standalone@localhost:9999 subsystem=modcluster] :write-attribute(name=advertise,value=true)
{
"outcome" => "failed",
"failure-description" => "No known attribute called advertise",
"rolled-back" => true
}