How to access GarbageCollectorMXBean with name ParNew in EAP 6

Issue

• How to access garbage collector MBean ?
• While accessing garbage collector for ParNew in standalone and domain mode, following error occur :

Standalone Mode :

[standalone@localhost:9999 /] /core-service=platform-mbean/type=garbage-collector/name=ParNew:read-attribute(name=collection-count)
{
    "outcome" => "failed",
    "failure-description" => "JBAS012320: No GarbageCollectorMXBean with name ParNew currently exists",
    "rolled-back" => true
}

Domain Mode :

[domain@localhost:9999 /] /host=master/server=server-one/core-service=platform-mbean/type=garbage-collector/name=ParNew:read-attribute(name=collection-count) 
{
    "outcome" => "failed",
    "result" => undefined,
    "failure-description" => "JBAS012320: No GarbageCollectorMXBean with name ParNew currently exists",
    "rolled-back" => true
}