Checkbox on login screen does not populate

Hi, I want to add a dropdown of companies on my login screen.
this is my login-view.xml code

<collection id="companyEInvsDc" class="com.company.einvoice.entity.CompanyEInv">
        <loader id="companyEInvsDl" readOnly="true">
            <query>
                <![CDATA[select e from CompanyEInv e]]>
            </query>
        </loader>
        <fetchPlan extends="_base"/>
    </collection>

<entityComboBox property="co" dataContainer="companyEInvsDc" id="companyField"/>

i added anonymous access for company

@ResourceRole(name = "AnonymousRestRole", code = AnonymousRestRole.CODE)
public interface AnonymousRestRole {
    String CODE = "anonymous-rest-role";

    @EntityAttributePolicy(entityClass = CompanyEInv.class,
            attributes = "*",
            action = EntityAttributePolicyAction.MODIFY)
    @EntityPolicy(entityClass = CompanyEInv.class,
            actions = {EntityPolicyAction.READ, EntityPolicyAction.UPDATE})
    void companyEinv();
}

and granted the access on DatabaseUserRepository.java

protected void initAnonymousUser(final User anonymousUser) {
        Collection<GrantedAuthority> authorities = getGrantedAuthoritiesBuilder()
                .addResourceRole(AnonymousRestRole.CODE)
                .build();
        anonymousUser.setAuthorities(authorities);
    }

but my login screen entity combo box does not show anything. (DB has some data). It does not show any error or anything

Hello!

Have you added the dataLoadCoordinator facet? dataLoadCoordinator :: Jmix Documentation

<facets>
    <dataLoadCoordinator auto="true"/>
</facets>

It triggers data loading on before show event. If you haven’t, then you should manually trigger data loading. For instance:

@ViewComponent
private CollectionLoader<CompanyEInv> companyEInvsDl;

@Subscribe
public void onBeforeShow(final BeforeShowEvent event) {
    companyEInvsDl.load();
}

i solved it by adding itemContainer.
What is the difference between dataContainer and itemContainer?

Edit: another issue came up. when i select any option in the dropdown, i get java.lang.IllegalStateException: Range is datatype error. Here is the snippet of my company entity

public class CompanyEInv {
    @Id
    @Column(name = "CO", nullable = false, length = 10)
    private String co;

    @InstanceName
    @Column(name = "NAME", nullable = false, length = 300)
    private String name;

here is the full stacktrace

java.lang.IllegalStateException: Range is datatype
	at io.jmix.core.metamodel.model.impl.DatatypeRange.asClass(DatatypeRange.java:34) ~[jmix-core-2.2.1.jar:na]
	at io.jmix.flowui.component.delegate.EntityFieldDelegate.getMetaClass(EntityFieldDelegate.java:49) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.component.delegate.EntityFieldDelegate.checkValueType(EntityFieldDelegate.java:68) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.component.combobox.EntityComboBox.checkValueType(EntityComboBox.java:101) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.component.combobox.EntityComboBox.setValue(EntityComboBox.java:89) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.data.binding.impl.FieldValueBinding.setComponentValue(FieldValueBinding.java:49) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.data.binding.impl.AbstractValueBinding.onValueSourceStateChanged(AbstractValueBinding.java:216) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.kit.event.EventBus.fireEvent(EventBus.java:82) ~[jmix-flowui-kit-2.2.1.jar:na]
	at io.jmix.flowui.data.value.ContainerValueSource.setState(ContainerValueSource.java:217) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.data.value.ContainerValueSource.containerItemChanged(ContainerValueSource.java:223) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.core.common.event.EventHub.publish(EventHub.java:172) ~[jmix-core-2.2.1.jar:na]
	at io.jmix.flowui.model.impl.InstanceContainerImpl.fireItemChanged(InstanceContainerImpl.java:167) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.model.impl.CollectionContainerImpl.setItem(CollectionContainerImpl.java:72) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.data.items.ContainerDataProvider.setSelectedItem(ContainerDataProvider.java:111) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.data.binding.impl.DataViewBindingImpl.componentValueChanged(DataViewBindingImpl.java:104) ~[jmix-flowui-2.2.1.jar:na]
	at io.jmix.flowui.data.binding.impl.DataViewBindingImpl.lambda$addComponentValueChangeListener$b50f1$1(DataViewBindingImpl.java:94) ~[jmix-flowui-2.2.1.jar:na]
	at com.vaadin.flow.component.internal.AbstractFieldSupport.lambda$addValueChangeListener$828eca10$1(AbstractFieldSupport.java:98) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.ComponentEventBus.fireEventForListener(ComponentEventBus.java:239) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.ComponentEventBus.fireEvent(ComponentEventBus.java:228) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.Component.fireEvent(Component.java:411) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.ComponentUtil.fireEvent(ComponentUtil.java:416) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.internal.AbstractFieldSupport.setValue(AbstractFieldSupport.java:209) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.internal.AbstractFieldSupport.setModelValue(AbstractFieldSupport.java:169) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.AbstractField.setModelValue(AbstractField.java:225) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.AbstractSinglePropertyField.doSetModelValue(AbstractSinglePropertyField.java:360) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.AbstractSinglePropertyField.handlePropertyChange(AbstractSinglePropertyField.java:352) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.component.AbstractSinglePropertyField$1.propertyChange(AbstractSinglePropertyField.java:329) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.internal.nodefeature.ElementPropertyMap.lambda$fireEvent$2(ElementPropertyMap.java:465) ~[flow-server-24.3.3.jar:24.3.3]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]
	at com.vaadin.flow.internal.nodefeature.ElementPropertyMap.fireEvent(ElementPropertyMap.java:465) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.internal.nodefeature.ElementPropertyMap$PutResult.run(ElementPropertyMap.java:170) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$1(ServerRpcHandler.java:436) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.runMapSyncTask(ServerRpcHandler.java:452) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$3(ServerRpcHandler.java:446) ~[flow-server-24.3.3.jar:24.3.3]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) ~[na:na]
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:446) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:324) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:114) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1573) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:398) ~[flow-server-24.3.3.jar:24.3.3]
	at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:106) ~[vaadin-spring-24.3.3.jar:na]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:614) ~[jakarta.servlet-api-6.0.0.jar:6.0.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:642) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:408) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:313) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:277) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:141) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:178) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:51) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:547) ~[jakarta.servlet-api-6.0.0.jar:6.0.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:614) ~[jakarta.servlet-api-6.0.0.jar:6.0.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at io.jmix.core.impl.logging.LogMdcFilter.doFilterInternal(LogMdcFilter.java:28) ~[jmix-core-2.2.1.jar:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:365) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:100) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:145) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:151) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:129) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:117) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:117) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:374) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191) ~[spring-security-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$3(HandlerMappingIntrospector.java:195) ~[spring-webmvc-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:225) ~[spring-security-config-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:352) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:268) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.3.jar:6.1.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.3.jar:6.1.3]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.18.jar:10.1.18]
	at java.base/java.lang.Thread.run(Thread.java:842) ~[na:na]

Note: the user is not associated to any company, the company chosen from login is to be stored in session storage and used for queries in pages.

itemsContainer allows you to specify a collection container from which the component should show a list of items in dropdown.
dataContainer and property must be used together. dataContainer specifies the instance container. And in property attribute you should specify the name of entity’s property from which the component will get a value and where the component will set selected value.

I guess your class type from itemsContainer differs from class type in property attribute.

For your task it will be enough to specify only itemsContainer and metaclass attributes. And in a controller listen a value change event.

For instance:

<entityComboBox id="userField" metaClass="User" itemsContainer="usersDc"/>
@Subscribe("userField")
public void onUserFieldComponentValueChange(final AbstractField.ComponentValueChangeEvent<EntityComboBox<User>, User> event) {
    sessionData.setAttribute("username", event.getValue().getUsername());
}

Note, metaClass is an entity name. Check your CompanyEInv class, if @Entity or @JmixEntity annotations contain the name attributes you should use it as metaClass value. If no use a simple class name.

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