I can't understand the reason behind ORA-01722: invalid number

Question

I have an issue that is generated randomly (one time between thousandth of calls). The error ORA-01722: invalid number is generated in a random way while executing sql update in a prepared statement Oracle database. The case details are as below:

try {
        connection = getConnection();
        statement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            if (params[i] instanceof Date) {
                statement.setTimestamp(i + 1, new Timestamp(((Date) params[i]).getTime()));
            } else if (params[i] instanceof java.util.Date) {
                statement.setTimestamp(i + 1, new Timestamp(((java.util.Date) params[i]).getTime()));
            } else {
                statement.setObject(i + 1, params[i]);
            }
            paramsBuilder.append(": " + params[i]);
        }
        if (logger.isInfoEnabled()) {
            logger.info("Query String  [" + sql + "] [" + paramsBuilder + "]");
            logger.info("Query Parameters [" + paramsBuilder + "]");
        }
        result = statement.executeUpdate();
        if (logger.isInfoEnabled()) {
            logger.info(result + " rows affected");
        }
    } catch (SQLException e) {
        if (logger.isInfoEnabled()) {
            String message = "Failed to execute SQL statment [" + sql + "] with parameters [" + paramsBuilder + "]";
            logger.error(message, e);
        }
        throw new DAOException(e);
    }

and the value in log is like that :

Failed to execute SQL statment [update CUSTOMER_CASE set no_of_ptp=?, no_of_unreached=?,collector_name=? , last_case_status_history_id=?, current_handler=?, handling_start_time=?,due_total_open_amount=?, payment_due_invoice_id =?  where id=?] with parameters [: 0: 0: auto: 5470508: null: null: 0.0: 23410984: 2476739] java.sql.SQLException: ORA-01722: invalid number

by tracing the query parameters at DB all parameters are transferred correctly through JDBC driver except for the parameter 23410984 it was replaced by the value "<C4>^X* U" (note this value contains carriage return before char 'u' !). I don't know why

Answer 1

The key reason is about java.sql.SQLException: ORA-01722: invalid number.
May be the field last_case_status_history_id type is number, but your parameter is null