有JDBC编程的人都会知道这是一个什么样的异常。做为刚出道的菜鸟我可因为这个异常把我整一下。
我希望这小段随笔能给阅读都带来帮助，也希望大家多多指教。
我在EJB中写了一个方法：public Vector searchCase(String dataSource,BlacksmokeEnqDataobject inputObj,String sql,int maxAllowSize){
  Connection con = null;
  Vector VqueryData = null;
  PreparedStatement ps = null;
  ResultSet rs = null;
  FormatFunctions ff = new FormatFunctions();
  BlacksmokeEnqReportDataobject blsObj = null;
  SqlFunctions sf = new SqlFunctions();
  try{
   con = getConnection(dataSource);
   String drv_ic_n = inputObj.getDrv_ic_n();
   String caseType = inputObj.getCaseType();
   String vehicleNo = inputObj.getVehNo();
   String fleetType = inputObj.getFleetType();
   String make = inputObj.getMake();
   String model = inputObj.getModel();
   String payFrom = inputObj.getPayDateFrom();
   String payTo = inputObj.getPayDateTo();
   String offFrom = inputObj.getOffeDateFrom();
   String offTo = inputObj.getOffeDateTo();
   String entryFrom = inputObj.getEntryDateFrom();
   String entryTo = inputObj.getEntryDateTo();
   int smokeFrom = inputObj.getSmokeFrom();
   int smokeTo = inputObj.getSmokeTo();
   if (drv_ic_n.equals("")){
    drv_ic_n = null;
   }
   if (caseType.equals("")){
    caseType = null;
   }
   if (vehicleNo.equals("")){
    vehicleNo = null;
   }
   if (fleetType.equals("")){
    fleetType = null;
   }
   if (make.equals("")){
    make = null;
   }
   if (model.equals("")){
    model = null;
   }
   if (payFrom.length()>0 && payFrom.equalsIgnoreCase("00/00/0000")){
    payFrom = null;
   }
   if (payTo.length()>0 && payTo.equalsIgnoreCase("00/00/0000")){
    payTo = null;
   }
   if (offFrom.length()>0 && offFrom.equalsIgnoreCase("00/00/0000")){
    offFrom = null;
   }
   if (offTo.length()>0 && offTo.equalsIgnoreCase("00/00/0000")){
    offTo = null;
   }
   if (entryFrom.length()>0 && entryFrom.equalsIgnoreCase("00/00/0000")){
    entryFrom = null;
   }
   if (entryTo.length()>0 && entryTo.equalsIgnoreCase("00/00/0000")){
    entryTo = null;
   }   
   String tmpSql = sf.retuSqlS(sql);
   tmpSql = sf.linkSql(tmpSql,":LS_CO_FINE_PAID_D_FROM",payFrom);
   tmpSql = sf.linkSql(tmpSql,":LS_CO_FINE_PAID_D_TO",payTo);
   tmpSql = sf.linkSql(tmpSql,":LS_BLS_OFFENCE_D_FROM",offFrom);
   tmpSql = sf.linkSql(tmpSql,":LS_BLS_OFFENCE_D_TO",offTo);
   tmpSql = sf.linkSql(tmpSql,":LS_ENTRY_D_FROM",entryFrom);
   tmpSql =  sf.linkSql(tmpSql,":LS_ENTRY_D_TO",entryTo);
   ps = con.prepareStatement(tmpSql);
//   System.out.println(tmpSql);
   int idx = 0;
   ps.setString(++idx,drv_ic_n);
   ps.setString(++idx,drv_ic_n);
   ps.setString(++idx,caseType);
   ps.setString(++idx,caseType);
   ps.setString(++idx,vehicleNo);
   ps.setString(++idx,vehicleNo);
   ps.setString(++idx,fleetType);
   ps.setString(++idx,fleetType);
   ps.setString(++idx,make);
   ps.setString(++idx,make);
   ps.setString(++idx,model);
   ps.setString(++idx,model);
   ps.setInt(++idx,smokeFrom);
   ps.setInt(++idx,smokeFrom);
   ps.setInt(++idx,smokeTo);
//   ps.setInt(++idx,smokeTo);  
   ps.executeQuery();
   rs = ps.getResultSet();
   VqueryData = new Vector();
   idx = 0;
   while(rs.next() && idx <= maxAllowSize){
    blsObj = new BlacksmokeEnqReportDataobject();
    blsObj.setDRV_IC_N(rs.getString("DRV_IC_N"));
    blsObj.setDRV_NM(rs.getString("DRV_NM"));
    blsObj.setBLS_CASE_N(rs.getString("BLS_CASE_N"));
    blsObj.setBLS_CASE_T(rs.getString("BLS_CASE_T"));
    blsObj.setVEH_REGN_N(rs.getString("VEH_REGN_N"));
    blsObj.setBLS_FLT_T(rs.getString("BLS_FLT_T"));
    blsObj.setBLS_MAKE_C(rs.getString("BLS_MAKE_C"));
    blsObj.setBLS_MODEL_C(rs.getString("BLS_MODEL_C"));
    blsObj.setBLS_OFFENCE_D(ff.dateFormat(rs.getDate("BLS_OFFENCE_D")));
    blsObj.setENTRY_D(ff.dateFormat(rs.getDate("ENTRY_D")));
    blsObj.setSMOKE_LEV_READ(rs.getInt("SMOKE_LEV_READ"));
    blsObj.setCO_FINE_PAID_D(ff.dateFormat(rs.getDate("CO_FINE_PAID_D")));
    VqueryData.addElement(blsObj);
    idx++;
   }
   }catch(Exception e){
    blsObj.setErrStatus(sf.ckException(e));
    VqueryData.addElement(blsObj);
    e.printStackTrace();
   }finally{
    SqlFunctions.cleanup(ps, rs);
    SqlFunctions.cleanup(con);
   }
  return VqueryData;
 }这是一个通过XML文件来传SQL语。把查询语句写在XML文件中，在Servlet中调用XML文件。
上面那个错误是因为没有对XML中的查询变量进行绑定，或者是多写，或少写变量，或者变量名写错了。后来我重新认真的做了一遍，发生我没有写错。我把JDeveloper关了，重新打开，可以了。我的没有想这是怎么一回，如果有同样问题的好友知道这是怎么一回事，请联系我rodney_luo@163.com. QQ:86322591