/**
* Returns the non-empty value of the given required query string parameter.
*
* <p>If this parameter occurs multiple times in the URL, only the last value is returned and
* others are silently ignored.
*
* @param paramname Name of the query string parameter to get.
* @return The value of the parameter.
* @throws BadRequestException if this query string parameter wasn't passed or if its last
* occurrence had an empty value ({@code &a=}).
*/
public String getRequiredQueryStringParam(final String paramname) throws BadRequestException {
final String value = getQueryStringParam(paramname);
if (value == null || value.isEmpty()) {
throw BadRequestException.missingParameter(paramname);
}
return value;
}
