List < SrmProtectionTaskVmTask > tasks = srmPortType.getTasks(ManagedObjectReference _this);

Where ManagedObjectReference _this = _protectionTaskRef;
where _protectionTaskRef can be taken from:
  SrmServiceInstanceContent content = _srmPortType.retrieveContent(_svcRef);
ManagedObjectReference _protectionRef = content.getProtection();
List < ManagedObjectReference > groups = srmPortType.listProtectionGroups(_protectionRef);
_protectionGroupRef = groups.get(0);
ManagedObjectReference _protectionTaskRef = srmPortType.protectVms(
  _protectionGroupRef,
  _vms);