在提交响应后,java.lang.IllegalStateException:Nan
java.lang.IllegalStateException:不能在提交响应后转发 
    int noOfRows = Integer.parseInt(request.getParameter("noOfRows"));
    String chkboxVal = "";
    // String FormatId=null;
    Vector vRow = new Vector();
    Vector vRow1 = new Vector();
    String GroupId = "";
    String GroupDesc = "";
    for (int i = 0; i < noOfRows; i++) {
        if ((request.getParameter("chk_select" + i)) == null) {
            chkboxVal = "notticked";
        } else {
            chkboxVal = request.getParameter("chk_select" + i);
            if (chkboxVal.equals("ticked")) {
                fwdurl = "true";
                Statement st1 = con.createStatement();
                GroupId = request.getParameter("GroupId" + i);
                GroupDesc = request.getParameter("GroupDesc" + i);
                ResultSet rs1 = st1                        .executeQuery("select FileId,Description from cs2k_Files "
                                + " where FileId like 'M%' and co_code = "
                                + ccode);
                ResultSetMetaData rsm = rs1.getMetaData();
                int cCount = rsm.getColumnCount();
                while (rs1.next()) {
                    Vector vCol1 = new Vector();
                    for (int j = 1; j <= cCount; j++) {
                        vCol1.addElement(rs1.getObject(j));
                    }
                    vRow.addElement(vCol1);
                }
                rs1 = st1                        .executeQuery("select FileId,NotAllowed from cs2kGroupSub "
                                + " where FileId like 'M%' and GroupId = '"
                                + GroupId + "'" + " and co_code = " + ccode);
                rsm = rs1.getMetaData();
                cCount = rsm.getColumnCount();
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