Jmix 2.0.2 ProcessFormContext.getTask() null

beatrixmolnar · October 6, 2023, 7:12am

Hi,

We have a problem that concerns BPM.
In Jmix 1.4.4 in our processes we used to receive the actual task from the processFormContext.getTask() method in our screens.

Now, in Jmix 2.0.2 this method always returns null (we use the processform annotation on the screen class of course), so if we would like to open a task from the My Tasks, it always fails, as task is null. But if we change the form type in the modeler from Jmix screen (in IntelliJ is screen, not view) to Input dialog, the task opening works well in My Tasks. Could you please advice us what we could do in this case?

Best regards,
Beatrix

gorbunkov · October 6, 2023, 4:03pm

Hi,

In which screen method do you access the processFormContext.getTask()? Could you provide a sample process from that demonstrates the issue?

peter.giber · October 11, 2023, 8:28am

Hi Maxim,

I have the same issue. This is process form:

import com.company.basepoc.entity.Request;
import com.company.basepoc.view.main.MainView;
import com.vaadin.flow.router.Route;
import io.jmix.bpmflowui.processform.ProcessFormContext;
import io.jmix.bpmflowui.processform.annotation.Outcome;
import io.jmix.bpmflowui.processform.annotation.ProcessForm;
import io.jmix.core.DataManager;
import io.jmix.flowui.view.*;
import org.slf4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;

@ProcessForm(outcomes = {@Outcome(id = "accepted"), @Outcome(id = "notAccepted")})
@Route(value = "BaseStepForm", layout = MainView.class)
@ViewController("BaseStepForm")
@ViewDescriptor("base-step-form.xml")
@EditedEntityContainer("requestDc")
public class BaseStepForm extends StandardDetailView<Request>  {

    private static final Logger log = org.slf4j.LoggerFactory.getLogger(BaseStepForm.class);
    @Autowired
    private ProcessFormContext processFormContext;

    @Autowired
    private DataManager dataManager;


    @Subscribe
    public void onInit(final InitEvent event) {

        if (processFormContext.getTask() == null) {
            log.info("processFormContext.getTask() null");
        }

        String processInstanceId = processFormContext.getTask().getProcessInstanceId();
        Request request = dataManager.load(Request.class)
                .query("select r from Request r where r.processInstanceId = :processInstanceId")
                .parameter("processInstanceId", processInstanceId).one();
        setEntityToEdit(request);
    }

}

Please check this code and advise what to do in this case.

Thanks,
Peter

gorbunkov · October 12, 2023, 7:18am

Hi,

How do you open this form? Using the standard BPM - My Tasks screen?

peter.giber · October 12, 2023, 7:48am

Hi,

Yes. I use the ‘Open task’ option for this purpose.

This is the exact error message I receive:

java.lang.NullPointerException: Cannot invoke "org.flowable.task.api.Task.getProcessInstanceId()" because the return value of "io.jmix.bpmflowui.processform.ProcessFormContext.getTask()" is null
	at com.company.basepoc.view.basestepform.BaseStepForm.onInit(BaseStepForm.java:53)
	at com.vaadin.flow.component.ComponentEventBus.fireEventForListener(ComponentEventBus.java:233)
	at com.vaadin.flow.component.ComponentEventBus.fireEvent(ComponentEventBus.java:222)
	at com.vaadin.flow.component.Component.fireEvent(Component.java:411)
	at com.vaadin.flow.component.ComponentUtil.fireEvent(ComponentUtil.java:416)
	at io.jmix.flowui.view.ViewControllerUtils.fireEvent(ViewControllerUtils.java:109)
	at io.jmix.flowui.sys.ViewSupport.fireViewInitEvent(ViewSupport.java:403)
	at io.jmix.flowui.sys.ViewSupport.initView(ViewSupport.java:121)
	at io.jmix.flowui.sys.vaadin.JmixSpringInstantiator.init(JmixSpringInstantiator.java:50)
	at io.jmix.flowui.sys.vaadin.JmixSpringInstantiator.getOrCreate(JmixSpringInstantiator.java:43)
	at com.vaadin.flow.di.Instantiator.createRouteTarget(Instantiator.java:136)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.lambda$getRouteTarget$1(AbstractNavigationStateRenderer.java:133)
	at java.base/java.util.Optional.orElseGet(Optional.java:364)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.getRouteTarget(AbstractNavigationStateRenderer.java:132)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.sendBeforeEnterEventAndPopulateChain(AbstractNavigationStateRenderer.java:493)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.createChainIfEmptyAndExecuteBeforeEnterNavigation(AbstractNavigationStateRenderer.java:474)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.handle(AbstractNavigationStateRenderer.java:212)
	at com.vaadin.flow.component.internal.JavaScriptNavigationStateRenderer.handle(JavaScriptNavigationStateRenderer.java:78)
	at com.vaadin.flow.component.UI.handleNavigation(UI.java:1785)
	at com.vaadin.flow.component.UI.navigate(UI.java:1170)
	at io.jmix.flowui.view.navigation.ViewNavigationSupport.navigate(ViewNavigationSupport.java:56)
	at io.jmix.flowui.view.navigation.AbstractNavigationProcessor.lambda$processNavigation$28d5aa88$1(AbstractNavigationProcessor.java:58)
	at com.vaadin.flow.component.page.Page.lambda$fetchCurrentURL$fb993594$1(Page.java:597)
	at com.vaadin.flow.component.page.PendingJavaScriptResult.lambda$then$3fde283c$1(PendingJavaScriptResult.java:113)
	at com.vaadin.flow.component.internal.PendingJavaScriptInvocation.complete(PendingJavaScriptInvocation.java:96)
	at com.vaadin.flow.server.communication.UidlWriter.lambda$createReturnValueChannel$d9004ac5$1(UidlWriter.java:317)
	at com.vaadin.flow.internal.nodefeature.ReturnChannelMap.lambda$registerChannel$2a20409b$1(ReturnChannelMap.java:124)
	at com.vaadin.flow.internal.nodefeature.ReturnChannelMap$ChannelImpl.invoke(ReturnChannelMap.java:74)
	at com.vaadin.flow.server.communication.ReturnChannelHandler.handleNode(ReturnChannelHandler.java:78)
	at com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler.handle(AbstractRpcInvocationHandler.java:74)
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocationData(ServerRpcHandler.java:438)
	at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$1(ServerRpcHandler.java:419)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:419)
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:320)
	at com.vaadin.flow.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:114)
	at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
	at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1529)
	at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:399)
	at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:106)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:614)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:642)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:408)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:313)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:277)
	at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:141)
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:178)
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:51)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1081)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:974)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:547)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:614)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at io.jmix.core.impl.logging.LogMdcFilter.doFilterInternal(LogMdcFilter.java:28)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231)
	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:477)
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:338)
	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:80)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:126)
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:100)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:110)
	at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:151)
	at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:129)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:107)
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:93)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:117)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:117)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:225)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:238)
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:321)
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:222)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:135)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:352)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:268)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:894)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:833)

Thanks,
Peter

gorbunkov · October 12, 2023, 12:59pm

It seems that patterns that worked for classic UI won’t work for FlowUI.

First, try getting the task not in the handler of the InitEvent, but in the handler of BeforeShow event.

Second, I’m not sure that StandardDetailView works correctly as a process form. Try to inherit your form not from the StandardDetailView, but from the StandardView.

The code below worked for me:

@ProcessForm
@Route(value = "order-process-form", layout = MainView.class)
@ViewController("OrderProcessForm")
@ViewDescriptor("order-process-form.xml")
@EditedEntityContainer("orderDc")
public class OrderProcessForm extends StandardView {
    private static final Logger log = LoggerFactory.getLogger(OrderProcessForm.class);

    @Autowired
    private ProcessFormContext processFormContext;

    @ProcessVariable
    private Order order;

    @ViewComponent
    private InstanceContainer<Order> orderDc;

    @ViewComponent
    private DataContext dataContext;

    @Subscribe
    public void onBeforeShow(final BeforeShowEvent event) {
        Task task = processFormContext.getTask();
        log.info("Task in beforeShow: {}", task);

        //Merge process variable into dataContext.
        //After that changes in UI components related with orderDc will be tracked
        Order managedOrder = dataContext.merge(order);

        //set merged entity into data container
        orderDc.setItem(managedOrder);
    }

    @Subscribe("completeTaskBtn")
    public void onCompleteTaskBtnClick(final ClickEvent<JmixButton> event) {
        //save dataContext - changes in the edited order entity will be saved to the database
        dataContext.save();
        //complete the user task
        processFormContext.taskCompletion().complete();
        closeWithDefaultAction();
    }

    @Subscribe("closeBtn")
    public void onCloseBtnClick(final ClickEvent<JmixButton> event) {
        close(StandardOutcome.CLOSE);
    }
}

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<view xmlns="http://jmix.io/schema/flowui/view"
      title="msg://orderProcessForm.title"
      focusComponent="form">
    <data>
        <instance id="orderDc"
                  class="com.company.bpmprocesstask.entity.Order">
            <fetchPlan extends="_base"/>
            <loader/>
        </instance>
    </data>
    <facets>
        <dataLoadCoordinator auto="true"/>
    </facets>
    <layout>
        <formLayout id="form" dataContainer="orderDc">
            <textField id="numberField" property="number"/>
            <datePicker id="dateField" property="date"/>
        </formLayout>
        <hbox id="detailActions">
            <button id="completeTaskBtn" text="Complete task"/>
            <button id="closeBtn" text="Close"/>
        </hbox>
    </layout>
</view>

beatrixmolnar · October 13, 2023, 1:11pm

Hi Maxim,

thank you for your help. We made some more tests and found out that actually, the processformContext.getTask() works perfectly if in the BPMN Inspector we set the Form Open mode type to Dialog.

But if it is set to This tab or New Tab, the processformContext.getTask() is null. In this case neither your solution worked for me. (But in Dialog also your solution works.)

To use the Dialog could be a workaround in short-term, but it would be good if there would be a solution the have the task in This or New Tab open mode as well.

peter.giber · October 16, 2023, 8:32am

Hi Maxim,

Same situation on my side as well. Your solution works only in case ‘Open mode’ is set to ‘Dialog’. Otherwise it results null just like before. Please advise if there is any other solution regarding this. Or if you experience the same and there is no proper solution to solve this issue now, please let me know if there will be a fix in the near future and if yes, when we can expect it.

Thanks,
Peter

gorbunkov · October 16, 2023, 11:09am

Hi,

It looks like a bug. I’ve created an issue for it. We’ll analyze the issue and will try to fix it in the upcoming Jmix 2.1 (planned for the end of October).

beatrixmolnar · October 16, 2023, 1:20pm

Thank you, Maxim, that sounds good!

By the way, meanwhile I checked the situation if I open forms programatically, so with processFormViews.openTaskProcessForm(), and the same happens: in Dialog open mode, we can get the task from processformcontext, but in New or This tab open mode, the processformcontext.gettask() is null.