public String getString(SessionID sessionID, String key) throws ConfigError, FieldConvertError { String value = interpolate(getSessionProperties(sessionID).getProperty(key)); if (value == null) { throw new ConfigError(key + " not defined"); } return value;
public String getString(String key) throws ConfigError, FieldConvertError { return getString(DEFAULT_SESSION_ID, key);
    public String getString(SessionID sessionID, String key) throws ConfigError, FieldConvertError {        String value = interpolate(getSessionProperties(sessionID).getProperty(key));        if (value == null) {            throw new ConfigError(key + " not defined");        }        return value;    }