Kaleo - The Update task does not show up after rejecting a task that is in Review

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE M4
• Fix Version/s: 6.2.0 CE M4
• Component/s: Workflow, Workflow > API > Kaleo Engine
• Labels: None
• Environment: Tomcat 7.0.34 + MySQL 5. Portal 6.2.x GIT ID: fbbe0bdcdbb2e286819b5676a119e42c82f07d04. ; Plugins 6.2.x GIT ID: 4f2a9d26c027c856f53c1293ac5fd2c931a4cd38.
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins/pull/1315

Steps to reproduce:

1. Deploy Kaleo Web plugin
2. Navigate to Control Panel > Workflow Configuration and select 'Single Approver (Version 1)' for Web Content
3. Navigate to Control Panel > Web Content and add a Basic Web Content called WebContent and click 'Submit for Publication'
4. Navigate to Control Panel > Workflow and then Submissions > Pending
5. Click on WebContent
6. Click on 'Assign to me' and then OK
7. While still in WebContent, click on Actions > Reject and than OK
8. Wait for one minute and refresh the page
   • The Update task does not appear.
9. Click Back to Liferay
10. Navigate back to Control Panel > Workflow and then Submissions > Pending and click on WebContent
    • The Update task does not appear.

Console errors also appear:

19:16:43,928 ERROR [liferay/kaleo_graph_walker-1][ParallelDestination:71] Unable to process message {destinationName=liferay/kaleo_graph_walker, response=null, responseDestinationName=null, responseId=null, payload=com.liferay.portal.workflow.kaleo.runtime.graph.PathElement@417cd3d2, values={permiss
ionChecker=com.liferay.portal.kernel.util.TransientValue@6a36a194, principalName=2, companyId=1}}
com.liferay.portal.kernel.messaging.MessageListenerException: com.liferay.portal.workflow.kaleo.runtime.notification.NotificationMessageGenerationException: Unable to generate notification message
        at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:31)
        at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:63)
        at com.liferay.portal.kernel.messaging.ParallelDestination$1.run(ParallelDestination.java:68)
        at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:675)
        at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:586)
        at java.lang.Thread.run(Thread.java:722)
Caused by: com.liferay.portal.workflow.kaleo.runtime.notification.NotificationMessageGenerationException: Unable to generate notification message
        at com.liferay.portal.workflow.kaleo.runtime.notification.TemplateNotificationMessageGenerator.generateMessage(TemplateNotificationMessageGenerator.java:78)
        at com.liferay.portal.workflow.kaleo.runtime.notification.NotificationUtil._sendKaleoNotification(NotificationUtil.java:58)
        at com.liferay.portal.workflow.kaleo.runtime.notification.NotificationUtil.sendKaleoNotifications(NotificationUtil.java:44)
        at com.liferay.portal.workflow.kaleo.runtime.node.BaseNodeExecutor.exit(BaseNodeExecutor.java:122)
        at com.liferay.portal.workflow.kaleo.runtime.graph.DefaultGraphWalker.follow(DefaultGraphWalker.java:50)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:320)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:80)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy471.follow(Unknown Source)
        at com.liferay.portal.workflow.kaleo.runtime.graph.messaging.PathElementMessageListener.doReceive(PathElementMessageListener.java:54)
        at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:25)
        ... 5 more
Caused by: com.liferay.portal.kernel.template.TemplateException: Unsupported template manager FREEMARKER
        at com.liferay.portal.kernel.template.TemplateManagerUtil._getTemplateManager(TemplateManagerUtil.java:181)
        at com.liferay.portal.kernel.template.TemplateManagerUtil.getTemplate(TemplateManagerUtil.java:87)
        at com.liferay.portal.workflow.kaleo.runtime.notification.TemplateNotificationMessageGenerator.generateMessage(TemplateNotificationMessageGenerator.java:64)
        ... 24 more

Expected result:
The Update task should appear under Tasks after rejecting the task that is in Review.

Actual result:
The Update task does not appear. This issue is different from LPS-28064, because even after waiting or refreshing the page the Update task still does not appear (see Michael Han's comment).