Type ‘java.lang.Object’ has no type parameters

private List<String> agvIds;
private String agvType;
private String firstClassification;
private Long warehouseId;
private List<String> zoneCodes;

public int hashCode() {
        int PRIME = 59;
        int result = 1;
        Object<String> $agvIds = (Object<String>) getAgvIds();
        result = result * 59 + (($agvIds == null) ? 43 : $agvIds.hashCode());
        Object $firstClassification = getFirstClassification();
        result = result * 59 + (($firstClassification == null) ? 43 : $firstClassification.hashCode());
        Object $warehouseId = getWarehouseId();
        result = result * 59 + (($warehouseId == null) ? 43 : $warehouseId.hashCode());
        Object<String> $zoneCodes = (Object<String>)getZoneCodes();
        result = result * 59 + (($zoneCodes == null) ? 43 : $zoneCodes.hashCode());
        Object<WITHS> $withs = (Object<WITHS>)getWiths();
        return result * 59 + (($withs == null) ? 43 : $withs.hashCode());

    }

How can I recover from the error without generating additional functions