求助！添加数据到数据库为什么一直产生执行数据库异常跳转到出错页面


这是我创建的数据库
下面是我的各部分代码：
1.这是一个利用get方法组（没有贴上来）获得从添加信息中输入的信息，然后把获得的信息连接成一个字符串，使用创建的数据库对象Statement的executeUpdate()执行sql语句，如果成功，转向success,失败转向fail。
public final class ShowAction extends Action{
      public ActionForward execute(ActionMapping mapping,ActionForm form,HttpServletRequest request,
            HttpServletResponse response)throws Exception{
        Locale locale=getLocale(request);
        MessageResources message=getResources(request);
        HttpSession session=request.getSession(true);
        GetNewForm userform=(GetNewForm)form;
        try{
            DataSource dataSource;
            
            Connection con;
             Class.forName("com.mysql.jdbc.Driver");
          con=DriverManager.getConnection("jdbc:mysql://localhost:3306/xinwen","root","123456");
          Statement st=con.createStatement();
           String title=userform.getTitle();
           String content=userform.getContent();
           String time="";
           String keyword=userform.getKeyword();
           String author=userform.getAuthor();
           java.util.Date d=new java.util.Date();
           String sql="insert into news(title,content,news_time,keyword,author)values("+title+","+content+","+time+","+keyword+","+author+")";
           st.executeUpdate(sql);
           return (mapping.findForward("success"));
           
        }
        catch(Exception e)
        {
            System.out.println(e.toString());
            return(mapping.findForward("fail"));
        }
    }}
2.下面这个类主要实现从数据库中获得记录，把记录放入到ArrayList类的对象里面 
public class ListAction extends Action {
    public Connection getCon()throws Exception
    {
        Class.forName("com.mysql.jdbc.Driver");
          Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/xinwen","root","123456");
         return con;
    }
    public ActionForward execute(ActionMapping mapping,ActionForm form,HttpServletRequest request,
            HttpServletResponse response)throws Exception
    {
        HttpSession session=request.getSession(true);
        ArrayList l=new ArrayList();
        try{
            Connection con=getCon();
            Statement st=con.createStatement();
            ResultSet rs=st.executeQuery("select *from news");
            while(rs.next())
            {
                ListForm f=new ListForm();
              
                f.setTitle(rs.getString(1));
                f.setContent(rs.getString(2));
                f.setTimes(rs.getString(3));
                f.setKeyword(rs.getString(4));
                f.setAuthor(rs.getString(5));
                
               l.add(f);
                
            }
            request.setAttribute("1",l);
           
            System.out.println("ok");
            return(mapping.findForward("view"));
        }
        catch(SQLException ex)
        {
            ex.printStackTrace();
            return(mapping.findForward("fail"));
        }
        }
    }
下面是我跳转的 jsp页面 添加数据后一直跳转到自己编写的error.jsp 出错 页面