This should not work, as the Monitor role is not allowed to do anything that modifies any state:

[standalone@localhost:9990 data-source=ExampleDS] :test-connection-in-pool{roles=Monitor}
{
    "outcome" => "success",
    "result" => [true]
}

I believe the problem is PoolOperations L75:

final ServiceController<?> managementRepoService = context.getServiceRegistry(false).getService(
        ConnectorServices.MANAGEMENT_REPOSITORY_SERVICE);

The parameter to context.getServiceRegistry(...) must be 'true' if the operation is going to use the returned service registry to perform any form of state modification. So I believe all the PoolOperation subclasses should provide a param to PoolOperation's constructor that can be used to set this value. I believe in all subclasses except DumpQueuedThreadInPool this param should be 'true'.