javaweb插入数据失败，无返回值，但没有报错是怎么回事

Question

问题应该出在在dao层，断点打过setObject也没异常，是怎么回事？
public int addNews(News n) {
int count = -1;
String sql = "insert into news values(@,?,?,?,?)";
Connection conn = null;
PreparedStatement pstmt = null;
conn = DBUtil.getConn();
try {
pstmt = conn.prepareStatement(sql);
pstmt.setObject(1, n.getTitle());
pstmt.setObject(2, n.getContent());
pstmt.setObject(3, n.getDate());
pstmt.setObject(3, n.getType());
count = pstmt.executeUpdate();
} catch (Exception e) {
// TODO: handle exception
}finally{
DBUtil.closeAll(conn, pstmt, null);
}
return count;
}

dbutil在其他serlvet中连接正常

private static String driver = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://localhost:3306/on?useUnicode=true&characterEncoding=utf-8&useAffectRows=true";
private static String user = "root";
private static String password = "123456";

前端的值也能拿过来
String title = request.getParameter("title");
    String content =request.getParameter("content");
    String date =request.getParameter("date");
    String type =request.getParameter("type");
    News n=new News(title,content,date,type);
    System.out.print(n.getTitle());
    System.out.print(n.getContent());
    System.out.print(n.getDate());
    System.out.print(n.getType());
    int addNews = NewsService.addNews(n);
    System.out.println(addNews);
    request.getRequestDispatcher("index").forward(request, response);
}

Answer 1

错误应该被try捕获了

加上打印语句