web提交页面出错，来个大神来看看啊！！！！

Java code

<%@ page language="java" import="java.util.*,java.sql.*,bbs.*"
    pageEncoding="GB18030"%>

<%
    request.setCharacterEncoding("UTF-8");
   
    int pid = Integer.parseInt(request.getParameter("pid"));
    int rootId = Integer.parseInt(request.getParameter("rootId"));

    String title = request.getParameter("title");
    System.out.println(title);
    String cont = request.getParameter("cont");
    System.out.println(cont);

    Connection conn = DB.getConn();
    String sql = "insert into article values(?,?,?,?,sysdate,?)";
    PreparedStatement pstmt = DB.prepareStmt(conn, sql);
    
    pstmt.setInt(1, pid);
    pstmt.setInt(2, rootId);
    pstmt.setString(3, title);
    pstmt.setString(4, cont);
    pstmt.setInt(5, 0);
    pstmt.executeUpdate();
    DB.close(pstmt);
    DB.close(conn);
%>

String sql = "insert into article values(?,?,?,?,sysdate,?)";
这样写提示出错：
  org.apache.jasper.JasperException: An exception occurred processing JSP page /replyDeal.jsp at line 24

21: pstmt.setString(3, title);
22: pstmt.setString(4, cont);
23: pstmt.setInt(5, 0);
24: pstmt.executeUpdate();
25: DB.close(pstmt);
26: DB.close(conn);
27: %>
  javax.servlet.ServletException: java.sql.SQLException: ORA-00947: 没有足够的值
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:865)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:794)
org.apache.jsp.replyDeal_jsp._jspService(replyDeal_jsp.java:122)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
----------------------------------------
String sql = "insert into article values(null,?,?,?,?,sysdate,?)";
这样写提示出错：
  javax.servlet.ServletException: java.sql.SQLException: ORA-01400: 无法将 NULL 插入 ("SCOTT"."ARTICLE"."ID")
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:865)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:794)
org.apache.jsp.replyDeal_jsp._jspService(replyDeal_jsp.java:122)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
----------------------------------------
数据库里ID号设置的是自增的
create sequence seq_article increment by 1 start with 1;
到底是哪里出错了，求解.....

------解决方案--------------------
楼主 把sql语句换成这样子：

String sql = &q