我试图在执行SQL插入时将标识列返回给我的Java程序。运行代码时出现以下错误

    Uncaught exception thrown in one of the service methods of the 
servlet: Cocoon. Exception thrown : java.lang.AbstractMethodError: java/sql
/Connection.prepareStatement(Ljava/lang/String;I)Ljava/sql/PreparedStatement;

这是我正在运行的代码。

private void insertUserInputParameters(ReportData rptData){

     UserInputParameters userParams = rptData.getUserInputData();
     StringBuilder sql = new StringBuilder();
     PreparedStatement pstmt = null;
     ResultSet rs = null;
     int userDataId = -1;

    //Get a database connection.
    sl = ServiceLocator.getInstance();
    ds = sl.getDataSource("jdbc/collegeguide");
    con = ds.getConnection();
    con.setReadOnly(false);

    sql.append("insert into cpgusrdtaf (statecd, addr1, addr2, city, state, ");
    sql.append("zipcode, dependent, shdindic, marstatus, residency, prntatge, ");
    sql.append("fincome, mincome, pincome, taxspaid, taxreturn, elig1040, ");
    sql.append("gincome, pcash, inetwrth, bnetwrth, pbenefit, paddlinf, ");
    sql.append("puntax, pdslcwrk, smstatus, sresidncy, studtr, stud1040, ");
    sql.append("sadjinc, sincome, spincome, sdslcwrk, studtax, scash, ");
    sql.append("sinvest, snetwrth, saddlinf, suntax, househld, nmbrsch, ");
    sql.append("studact, studsat, schools, housing) ");
    sql.append("values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?, ");
    sql.append("?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)");

    //This line of code is where I get the error**
    pstmt = con.prepareStatement(sql.toString(), Statement.RETURN_GENERATED_KEYS);

    //If I remove the 'Statement.RETURN_GENERATED_KEYS' I do not get the error.**
    pstmt = con.prepareStatement(sql.toString());

    setStatementValues(pstmt, userParams);
    pstmt.executeUpdate();

    rs = pstmt.getGeneratedKeys();
    if(rs.next()){
       userDataId = rs.getInt(1);
    }

我不允许使用存储过程，所以我不能走那条路。任何帮助将不胜感激

我正在使用Java 1.5

预先感谢道格