java.io.StreamCorruptedException: invalid stream header

Question

大家看看有什么问题吗，为什么ObjectInputStream in  = new ObjectInputStream(blob.getBinaryStream());
报错呢
public static List TOLIST(Blob blob)throws  IOException{ List l = new ArrayList(); try  {            ObjectInputStream in  = new ObjectInputStream(blob.getBinaryStream());            l = (List)in.readObject();            in.close();               return  l;        }  catch  (Exception e) {             //  TODO: handle exception            System.out.println("BlobToObject");            e.printStackTrace();             return   null ;        } }