Object delegateToObjectState(String attributeName) throws MBeanException {
    try {
      FederationComponent federation =
          (FederationComponent) monitoringRegion.get(objectName.toString());
      return federation.getValue(attributeName);
    } catch (Exception e) {
      throw new MBeanException(e);
    } catch (VirtualMachineError e) {
      SystemFailure.initiateFailure(e);
      throw e;
    } catch (Throwable t) {
      SystemFailure.checkFailure();
      throw new MBeanException(new Exception(t.getLocalizedMessage()));
    }
  }
This will get the data from Object state which is replicated across the hidden region
FederationComponent being the carrier.
geode-core/src/main/java/org/apache/geode/management/internal/MBeanProxyInvocationHandler.java