gistfile1.js

var vCAC_Machine = Server.findAllForType("vCAC:VirtualMachine","VMUniqueID eq '" + vm.config.instanceUuid + "'");  
var virtualMachineEntity = vCAC_Machine[0].getEntity(); //to get entity  
var vmEntityProps = virtualMachineEntity.getProperties(); //to get Entity properties for the next step  

vmEntityProps.remove('VMDNSName');  
vmEntityProps.put('VMDNSName', newName);  
vmEntityProps.put("VirtualMachineName", newName);

var hostId = virtualMachineEntity.hostId;  
var modelName = virtualMachineEntity.modelName;  
var entitySetName = virtualMachineEntity.entitySetName;  
var entityIdString = virtualMachineEntity.keyString;  

//Magic!  
var Entity_Update = System.getModule("com.vmware.library.vcac").updateVCACEntity(hostId,modelName,entitySetName,entityIdString,vmEntityProps,null,null);  
var VM_update_Hostname = System.getModule("com.vmware.library.vcac").addUpdatePropertyFromVirtualMachineEntity(vCAC_host,virtualMachineEntity,"Hostname",newName,false,false,false,false);

//bind variables
var workflowPath = 'Library/vCenter/Virtual Machine management/Basic';
var workflowNameToInvoke = 'Rename virtual machine';

//create execution properties
var executionProperties = new Properties();
executionProperties.put('newName',newName);
executionProperties.put('vm',vm);
//find worfklow catagory and get all workflows
var workflows = Server.getWorkflowCategoryWithPath(workflowPath).allWorkflows;
//loop over each workflow and find the workflow based on name
for each(var workflowObject in workflows){
    if(workflowNameToInvoke == workflowObject.name){
        //execute workflow and get workflowToken
        var currentToken = workflowObject.execute(executionProperties)
        //wait for workflow completions
        var complete = false;
        while(complete == false){
            if(currentToken != null && (currentToken.state != "running" && currentToken.state != "waiting")){
                System.log("Workflow '"+currentToken.name+"' terminated with status '"+currentToken.state+"'");
                complete = true;
            }
        }
        //get output from the workflow token
        var outputPropertiesToken = currentToken.getOutputParameters()
        System.log('outputPropertiesToken.keys: ' + outputPropertiesToken.keys)
        System.log("outputPropertiesToken.get('stringOutput'): " + outputPropertiesToken.get('stringOutput'))
        break;
    }
}

for each(var workflowObject in workflows){
    if(workflowNameToInvoke == workflowObject.name){
        //execute workflow and get workflowToken
        var currentToken = workflowObject.execute(executionProperties)
        //wait for workflow completions
        var complete = false;
        while(complete == false){
            if(currentToken != null && (currentToken.state != "running" && currentToken.state != "waiting")){
                System.log("Workflow '"+currentToken.name+"' terminated with status '"+currentToken.state+"'");
                complete = true;
            }
        }
        break;
    }
}