Getting all host from Vcenter no getting metric values Vsphere SDK 6.0 for Java

Hello,

I'm trying to integrate with sdk vsphere 6.0. I follow tutorial for getting Performance Metrics from HostSystem. vSphere 6.0 Documentation Center

The code works when i connect to to esxi directly and i can get the metrics. My problem is when i trying to connect with the vsphere center. I can get all host, but metrics values is empty.

I have to configure something in VCenter Server?,

Thank you