Oracle Blob字段写入时产生转型异常Cast Exception

我用Hibnernate（JDBC太麻烦了）写图片到Blob字段，产生转型异常，
       Configuration config =  new Configuration().configure();
//       config.addClass(TSealTemplate.class);
       SessionFactory sf= config.buildSessionFactory();
        //SessionFactory sf = HibernateSessionFactory.getSessionFactory();
        s = sf.openSession(); 
        Transaction tx = s.beginTransaction();
        TSealTemplate c = new TSealTemplate();
        c.setUserid("USER0001");
        c.setSealTemplBlob(Hibernate.createBlob(buffer));
        s.save(c);
        s.flush();
        s.refresh(c, LockMode.UPGRADE);

       BLOB blob = (BLOB) c.getSealTemplBlob();

关于此问题在JavaEye上有一篇文章讨论，原因是
java.sql.Blob不能强制传唤成oracle.sql.BLOB

解决方法如下：


        SerializableBlob blob=(SerializableBlob)c.getSealTemplBlob();
        BLOB blob2 = (BLOB)blob.getWrappedBlob();    
        OutputStream out = blob2.getBinaryOutputStream();