...

    private static final String DEFAULT_VM_NAME = "Sample-Default-VM";
    private VM vmService;
    private GuestOS vmGuestOS = GuestOS.WINDOWS_9_64;
    private String defaultVMId;

              ...

    public VMTypes.PlacementSpec getPlacementSpecForCluster(
            StubFactory stubFactory, StubConfiguration sessionStubConfig,
            String datacenterName, String clusterName,
            String vmFolderName, String datastoreName) {

            String clusterId =
                    ClusterHelper.getCluster(stubFactory,
                        sessionStubConfig,
                        datacenterName,
                        clusterName);
            System.out.println("Selecting cluster " + clusterName + "(id="
                               + clusterId + ")");

            String vmFolderId =
                    FolderHelper.getFolder(stubFactory,
                        sessionStubConfig,
                        datacenterName,
                        vmFolderName);
            System.out.println("Selecting folder " + vmFolderName + "id=("
                               + vmFolderId + ")");

            String datastoreId =
                    DatastoreHelper.getDatastore(stubFactory,
                        sessionStubConfig,
                        datacenterName,
                        datastoreName);
            System.out.println("Selecting datastore " + datastoreName + "(id="
                               + datastoreId + ")");

            /*
             *  Create the virtual machine placement spec with the datastore, resource pool,
             *  cluster and vm folder
             */
            VMTypes.PlacementSpec vmPlacementSpec = new VMTypes.PlacementSpec();
            vmPlacementSpec.setDatastore(datastoreId);
            vmPlacementSpec.setCluster(clusterId);
            vmPlacementSpec.setFolder(vmFolderId);

            return vmPlacementSpec;
        }

    private void createDefaultVM() {
        VMTypes.PlacementSpec vmPlacementSpec =
                     this.getPlacementSpecForCluster(
                     this.vapiAuthHelper.getStubFactory(),
                     this.sessionStubConfig,
                     this.datacenterName,
                     this.clusterName,
                     this.vmFolderName,
                     this.datastoreName);


        VMTypes.CreateSpec vmCreateSpec =
                new VMTypes.CreateSpec.Builder(this.vmGuestOS)
                    .setName(DEFAULT_VM_NAME)
                    .setPlacement(vmPlacementSpec)
                    .build();

                ...     
    }