Use these commands in wsadmin to list users and groups in roles on the topic space root.
$AdminTask listUsersInTopicSpaceRootRole
{-bus busName
-topicSpace topicSpaceName
-role roleName}
$AdminTask listGroupsInTopicSpaceRootRole
{-bus busName
-topicSpace topicSpaceName
-role roleName}
$AdminConfig save