新手，求教一个EJB的问题，弄了一晚上了 各位大侠救命```在线等

会话外观模式写的
public Collection<Book> findAll()throws Exception
    {
        Collection<Book> rt=new ArrayList<Book>();
        Context ctx = new InitialContext();
        BookEntityHome localhome = (BookEntityHome)ctx.lookup("znn/BookEntityEJB");        
        BookEntity obj = (BookEntity) localhome.findAll();//findAll()返回Collection
        Book book=new Book();
        book.setId(obj.getBookID());
        book.setName(obj.getBookName());
        book.setPrice(obj.getBookPrice());
        book.setAuthor(obj.getBookAuthor());        
        rt.add(book);
        return rt;
    }
出现异常,请问是哪里出错了

[[it] 本帖最后由 kenda525 于 2008-2-29 00:06 编辑 [/it]]