关于java调用Oracle存储过程返回结果集

存储过程是这样的CREATE OR REPLACE PACKAGE pkg_cursor_ciq_fin
As
type curs_fee_result is ref cursor;
procedure prc_finance_fee_result_query
            (in_decl_code      IN  varchar2,
                 in_decl_reg_code  IN   varchar2,
                 in_startDate      IN   varchar2,
                 in_endDate        IN   varchar2,
                 in_flag           IN   char,
                 curs_fee           OUT  curs_fee_result);
end pkg_cursor_ciq_fin; 
我现在程序是这样的Connection con = null;
//Statement stmt = null;
        //ResultSet rs = null;
       CallableStatement callStat = null;    
       OracleCallableStatement stmt = null;    
       ArrayList arrJfList = new ArrayList();
        
        try
        {
          con = DriverManager.getConnection("jdbc:oracle:thin:@10.33.3.253:1521:oral","eplatform","lgxlgx");
          stmt = (OracleCallableStatement) con.prepareCall("{call CIQ_FINANCE.pkg_cursor_ciq_fin.prc_finance_fee_result_query@LKCIQFINANCE(?,?,?,?,?,?)}");
          stmt.setString(1, "" );//,号后面还有一个参数是你传的
          stmt.setString(2, declNo );
          stmt.setString(3, "" );
          stmt.setString(4, "" );
          stmt.setString(5, "" );
          stmt.registerOutParameter(6, OracleTypes.CURSOR);
          stmt.executeUpdate();
          
          ResultSet rs = (ResultSet)stmt.getObject(6);          //ResultSet rs = (ResultSet)stmt.getCursor(6);
          /*ResultSet rs = ((OracleCallableStatement)stmt).getCursor(6);
          while( rs.next() )
          {
            System.out.println(rs.getString(0));
          }*/
          System.out.println("dddd");
          stmt.close();
          con.close();
        }执行到 
ResultSet rs = (ResultSet)stmt.getCursor(6);
        
这里是时候会出现
无效 SQL 语句 这样的错误请高手指定怎么把这个结果给得到!