jsp页面编写问题

我再运行后，页面提示报错，错误的代码如下：
An error occurred at line: 44 in the jsp file: /login-in123.jsp
Duplicate local variable stmt
41:    String sql = "select username,password from alluser where username='" + sUserName
42:      + "' and password = '" + sPasswd + "'";
43: 
44:    Statement stmt = connection.createStatement ( );
45:    ResultSet rs = stmt.executeQuery ( sql ); //返回查询结果
46: 
47:    //如果记录集非空，表明有匹配的用户名和密码，登陆成功


能帮我看看是哪错了吗？

答案：Duplicate local variable stmt
应该是定义了2个stmt变量

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