Injecting LookupPickerField is giving NullPointerException

Support
#1

Hello Support Team,

I am trying to provide a default value that changes with the change of another field in an edit screen, so i am injecting the LookupPickerField with the id countryId in the edit screen controller but it’s not injected for some reason that i couldn’t find, my XML is:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<window xmlns="http://schemas.haulmont.com/cuba/window.xsd"
        caption="msg://editorCaption"
        class="com.company.vp.web.workschedule.WorkScheduleEdit"
        datasource="workScheduleDs"
        focusComponent="fieldGroup"
        messagesPack="com.company.vp.web.workschedule">
    <dsContext>
        <datasource id="workScheduleDs"
                    class="com.company.vp.entity.WorkSchedule"
                    view="workSchedule-view"/>
        <collectionDatasource id="countriesDs"
                                class="com.company.vp.entity.Country"
                                view="_local">
            <query>
                <![CDATA[select e from vp$Country e]]>
            </query>
        </collectionDatasource>
        <collectionDatasource id="sectorsDs"
                                class="com.company.vp.entity.CountrySector"
                                view="_minimal">
            <query>
                <![CDATA[select e from vp$CountrySector e where e.country.id = :ds$countriesDs]]>
            </query>
        </collectionDatasource>
    </dsContext>
    <dialogMode height="600"
                width="800"/>
    <layout expand="windowActions"
            spacing="true">
        <fieldGroup id="fieldGroup"
                    datasource="workScheduleDs">
            <column width="250px">
                <field id="countryId"
                        optionsDatasource="countriesDs"
                        property="country"/>
                <field id="sectorId"
                        optionsDatasource="sectorsDs"
                        property="sector"/>
                <field property="name"/>
                <field property="type"/>
                <field property="noOfHours"/>
                <field property="weekendDays"/>
                <field property="startDate"/>
                <field property="endDate"/>
            </column>
        </fieldGroup>
        <frame id="windowActions"
                screen="editWindowActions"/>
    </layout>
</window>

my screen controller code is:

public class WorkScheduleEdit extends AbstractEditor<WorkSchedule> {
    @Inject
    private LookupPickerField countryId;

    @Inject
    private LookupPickerField sectorId;

    @Override
    public void init(Map<String, Object> params){

        countryId.addValueChangeListener(

                e -> getItem()
//                        getItem().setName
//                        (getItem().getCountry()
//                                .getName().concat(" - Work Schedule"))
        );
    }
}

the error message is:

java.lang.NullPointerException
	at com.company.vp.web.workschedule.WorkScheduleEdit.init(WorkScheduleEdit.java:19)

line 19 is:

countryId.addValueChangeListener(

can you please help.

#2

Hi Tarek,

To inject the component as a part of a FieldGroup, use the @Named annotation with both fieldGroup and field identifiers:

@Named("fieldGroup.countryId")
private LookupPickerField countryId;

See also the documentation.

1 Like
#3

Hi,

By the way, could you please use triple back quotes for code blocks.

1 Like