Utilization details fail to load in SDDC Manager 9.x

Products

• VMware SDDC Manager / VCF Installer

Issue/Introduction

A similar error is observed in the SDDC manager's resource-aggregator.log

/var/log/vmware/vcf/operationsmanager/resource-aggregator.log

2026-06-25T13:24:43.018+0000 ERROR [vcf_om,6a3d2bf7c35b4d6005983eb552eabdd7,d410] [c.v.v.r.s.u.v.c.ClusterMetricsCacheHelper,ra-exec-5] Exception while populating the usage and other metrics for cluster ClusterName
java.lang.ClassCastException: Cannot cast jdk.proxy2.$Proxy349 to com.vmware.vim.binding.vim.Datacenter
        at java.base/java.lang.Class.cast(Class.java:3892)
        at com.vmware.vim.vmomi.client.http.impl.HttpClient.createStub(HttpClient.java:73)
        at com.vmware.evo.sddc.common.client.vmware.BaseVmomiClient.createStub(BaseVmomiClient.java:93)
       

Environment

VMware Cloud Foundation 9.x

Cause

The ESXi clusters are nested in custom folders which causes the SDDC Manager resource aggregator API to fail.
Nesting SDDC managed clusters in folders is currently not supported. 

Resolution

Remove the clusters from the custom folders.

Note: It can take 5–10 minutes for SDDC Manager to update and display utilization details.