obj = new HashMap<String, Object>();
obj.put("name", "Mona Lisa");
obj.put("data", bais);
coll.insert(obj);
Map<String, Object> obj3 = coll.findOne(_factory.createDocument("uid", obj.get("uid")));
assertEquals("Mona Lisa", obj3.get("name"));
InputStream is3 = (InputStream)obj3.get("data");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[64 * 1024];
int read;