Where's the error in this code...

Question

the following snippet of code throws a SQLException with a 'Invalid Handle' message.
What's does this 'Invalid Handle' mean? And, which line of code is causing the problem?
try {
//RETRIEVE CITYLIST FROM DB
cityList = statement.executeQuery("SELECT CityCode, CityName FROM CityList");
while (cityList.next()) {
//ADD CODES AND NAMES OF CITIES TO ARRAYLISTS
String code = cityList.getString(1);
String name = cityList.getString(2);
codes.add(code);
names.add(name);
cityList.close();
} catch (SQLException sql) {
System.out.println("2-checkForAvailability.jsp..err->" + sql);
Any help will be appreciated..
regards
Ushanta

Answer 1

Yes, you don't declare the ResultSet inside that try block, so I'll assume that it's a data member of your class. I'd suggest that you make the ResultSet a local variable in that method and not try to hang onto it. Same for the statement:
Statement statement = null;
ResultSet cityList = null;
try
statement = connection.createStatement();
cityList = statement.executeQuery("SELECT CityCode, CityName FROM CityList");
while (cityList.next())
    String code = cityList.getString(1);
    String name = cityList.getString(2);
    codes.add(code);
    names.add(name);
} catch (SQLException sql)
    sql.printStackTrace();
    System.err.println("SQL state: " + sql.getSQLState());
     System.err.println("SQL error: " + sql.getErrorCode());
finally
    try
        if (cityList != null)
            cityList.close();
        if (statement != null)
            statement.close();
    catch (SQLException ignoreException)