TagPicker

@JmixEntity
@Table(name = "UIEX1_DEPARTMENT")
@Entity(name = "uiex1_Department")
public class Department {
    @InstanceName
    @Column(name = "NAME")
    private String name;

    @JoinColumn(name = "PARENT_DEPT_ID")
    @ManyToOne(fetch = FetchType.LAZY)
    private Department parentDept;

    @JoinColumn(name = "MANAGER_ID")
    @ManyToOne(fetch = FetchType.LAZY)
    private Employee manager;

    @OneToMany(mappedBy = "department")
    private List<Employee> employees;
}

@JmixEntity
@Table(name = "UIEX1_EMPLOYEE")
@Entity(name = "uiex1_Employee")
public class Employee {
    @InstanceName
    @Column(name = "NAME")
    private String name;

    @OneToMany(mappedBy = "employee")
    private List<EquipmentLine> equipment;

    @JoinColumn(name = "DEPARTMENT_ID")
    @ManyToOne(fetch = FetchType.LAZY)
    private Department department;
}

<data>
    <instance id="departmentDc"
              class="ui.ex1.entity.Department">
        <fetchPlan extends="_base">
            <property name="employees" fetchPlan="_base"/>
        </fetchPlan>
        <loader/>
    </instance>
    <collection id="employeesDc"
                class="ui.ex1.entity.Employee">
        <fetchPlan extends="_base"/>
        <loader id="employeesDl">
            <query>
                <![CDATA[select e from uiex1_Employee e]]>
            </query>
        </loader>
    </collection>
</data>
<layout>
    <tagPicker id="employeesTagPicker"
               property="employees"
               dataContainer="departmentDc"
               optionsContainer="employeesDc">
        <actions>
            <action id="lookup" type="tag_lookup"/>
            <action id="clear" type="value_clear"/>
        </actions>
    </tagPicker>
</layout>

<data>
    <collection id="employeesDc"
                class="ui.ex1.entity.Employee">
        <fetchPlan extends="_base"/>
        <loader id="employeesDl">
            <query>
                <![CDATA[select e from uiex1_Employee e]]>
            </query>
        </loader>
    </collection>
</data>
<layout>
    <tagPicker id="employeesPicker"
               metaClass="uiex1_Employee"
               optionsContainer="employeesDc">
        <actions>
            <action id="lookup" type="tag_lookup"/>
            <action id="clear" type="value_clear"/>
        </actions>
    </tagPicker>
</layout>

<layout>
    <tagPicker id="dataTypeTagPicker"
               inlineTags="true"/>
</layout>

@Autowired
private TagPicker<String> dataTypeTagPicker;

@Subscribe
public void onInit(InitEvent event) {
    dataTypeTagPicker.setOptionsList(Arrays.asList(
            "Headphones", "Keyboard", "Mouse")
    );
}