Accessing Vdata - Group has no children.

I have a Group/TreeNode called Swath Attributes in and H4File which contains only instances of Compound/Vdata.
When I try to access with the Enumeration/node stuff from:
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeNode;
when I arrive at the the Swath Attributes it says that it has no children so I cannot use this approach:
   if (obj instanceof H4Vdata)
                     vdata = (H4Vdata)obj;

Note: I made sure it was unzipped with hrepack.

When I try to instantiate an H4Vdata object directly, I cannot create a FileFormat and am unclear on the syntax:

FFH4Instance = FileFormat.getFileFormat(FileFormat.FILE_TYPE_HDF4);
  FileFormat ff = FFH4Instance.createInstance(inputFile,FileFormat.FILE_CREATE_OPEN);

I can't seem to settle on a name and path that will find anything:

public*H4Vdata*(FileFormat <> theFile,
                java.lang.String name,
                java.lang.String path)

fileobj = new H4Vdata(ff,"_FV_olr","/L2_Standard_atmospheric&surface_product/Swath Attributes/");

Any help is appreciated.