String key = bv.getReferenceStreamId();
// now force to serialize
File saved = new File(UnitTestUtil.getTestScratchPath()+"/blobassaved.bin"); //$NON-NLS-1$
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(saved));
out.writeObject(bv);
out.close();
// now read back the object from serilized state
ObjectInputStream in = new ObjectInputStream(new FileInputStream(saved));
BlobType read = (BlobType)in.readObject();