Here is my little sample that only include 2 entity: GitHub - peace0phmind/cuba-component-filter-sample
This XML filter is fine in cuba 6.9. I do the same thing in 7.X got NullPointerException.
<?xml version="1.0" encoding="UTF-8"?>
<filter>
<and>
<c name="dbhYSNgKIW" class="com.company.entity.Area" paramWhere="{E}.parent is null" width="1" type="CUSTOM" locCaption="province" entityAlias="e"><![CDATA[{E}.province = :component$filter.dbhYSNgKIW99052]]>
<param name="component$filter.dbhYSNgKIW99052" javaClass="com.company.entity.Area">NULL</param>
</c>
<c name="RcgqSegpmH" class="com.company.entity.Area" paramWhere="{E}.parent is not null and {E}.parent = :component$filter.dbhYSNgKIW99052" width="1" type="CUSTOM" locCaption="city" entityAlias="e"><![CDATA[{E}.city = :component$filter.RcgqSegpmH34593]]>
<param name="component$filter.RcgqSegpmH34593" javaClass="com.company.entity.Area">NULL</param>
</c>
</and>
</filter>
the exception
java.lang.NullPointerException
at com.haulmont.cuba.gui.data.impl.AbstractCollectionDatasource.getQueryParameters(AbstractCollectionDatasource.java:259)
at com.haulmont.cuba.gui.data.impl.AbstractCollectionDatasource.createDataQuery(AbstractCollectionDatasource.java:508)
at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.beforeLoadData(CollectionDatasourceImpl.java:635)
at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.loadData(CollectionDatasourceImpl.java:609)
at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.refresh(CollectionDatasourceImpl.java:161)
at com.haulmont.cuba.gui.data.impl.CollectionDatasourceImpl.refresh(CollectionDatasourceImpl.java:119)
at com.haulmont.cuba.gui.components.filter.Param.createOptionsDataSource(Param.java:931)
at com.haulmont.cuba.gui.components.filter.Param.createEntityLookup(Param.java:881)
at com.haulmont.cuba.gui.components.filter.Param.createEditComponent(Param.java:571)
at com.haulmont.cuba.gui.components.filter.edit.ConditionFrame.createDefaultValueComponent(ConditionFrame.java:102)
at com.haulmont.cuba.gui.components.filter.edit.ConditionFrame.setCondition(ConditionFrame.java:92)
at com.haulmont.cuba.gui.components.filter.edit.CustomConditionFrame.setCondition(CustomConditionFrame.java:215)
at com.haulmont.cuba.gui.components.filter.edit.CustomConditionFrame.setCondition(CustomConditionFrame.java:49)
at com.haulmont.cuba.gui.components.filter.edit.FilterEditor.lambda$init$1(FilterEditor.java:281)
at com.haulmont.bali.events.EventRouter.fireEvent(EventRouter.java:45)
at com.haulmont.cuba.gui.data.impl.AbstractDatasource.fireItemChanged(AbstractDatasource.java:261)
at com.haulmont.cuba.gui.data.impl.AbstractCollectionDatasource.setItem(AbstractCollectionDatasource.java:97)
at com.haulmont.cuba.gui.components.data.tree.DatasourceTreeItems.setSelectedItem(DatasourceTreeItems.java:142)
at com.haulmont.cuba.web.gui.components.WebTree.onSelectionChange(WebTree.java:956)
at com.vaadin.ui.components.grid.SingleSelectionModel.lambda$addSelectionListener$91fe6b9f$1(SingleSelectionModel.java:56)
at sun.reflect.GeneratedMethodAccessor180.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:496)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:273)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:237)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1041)
at com.vaadin.ui.components.grid.SingleSelectionModelImpl.setSelectedFromServer(SingleSelectionModelImpl.java:179)
at com.vaadin.ui.components.grid.SingleSelectionModelImpl.select(SingleSelectionModelImpl.java:97)
at com.vaadin.ui.Grid.select(Grid.java:4041)
at com.vaadin.ui.Tree.select(Tree.java:541)
at com.haulmont.cuba.web.gui.components.WebTree.setSelectedInternal(WebTree.java:1047)
at com.haulmont.cuba.web.gui.components.WebTree.setSelected(WebTree.java:1038)
at com.haulmont.cuba.web.gui.components.WebTree.setSelected(WebTree.java:1023)
at com.haulmont.cuba.gui.components.filter.edit.FilterEditor.lambda$init$2(FilterEditor.java:309)
at com.haulmont.cuba.gui.components.filter.AddConditionHelper.lambda$_addCondition$1(AddConditionHelper.java:119)
at com.haulmont.cuba.gui.components.compatibility.AfterCloseListenerAdapter.accept(AfterCloseListenerAdapter.java:58)
at com.haulmont.cuba.gui.components.compatibility.AfterCloseListenerAdapter.accept(AfterCloseListenerAdapter.java:26)
at com.haulmont.bali.events.EventHub.publish(EventHub.java:170)
at com.haulmont.cuba.gui.screen.Screen.fireEvent(Screen.java:128)
at com.haulmont.cuba.gui.screen.Screen.close(Screen.java:343)
at com.haulmont.cuba.gui.components.Window.close(Window.java:241)
at com.haulmont.cuba.gui.components.filter.edit.CustomConditionEditor.commit(CustomConditionEditor.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.haulmont.cuba.gui.xml.DeclarativeAction.actionPerform(DeclarativeAction.java:96)
at com.haulmont.cuba.web.gui.components.WebButton.buttonClicked(WebButton.java:62)
at com.haulmont.cuba.web.widgets.CubaButton.fireClick(CubaButton.java:76)
at com.vaadin.ui.Button$1.click(Button.java:57)
at sun.reflect.GeneratedMethodAccessor181.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:153)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:115)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:431)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:396)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:260)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:82)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1577)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:425)
at com.haulmont.cuba.web.sys.CubaApplicationServlet.serviceAppRequest(CubaApplicationServlet.java:329)
at com.haulmont.cuba.web.sys.CubaApplicationServlet.service(CubaApplicationServlet.java:215)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:107)
at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:73)
at com.haulmont.cuba.web.sys.CubaHttpFilter.doFilter(CubaHttpFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)