Flowable-ui 6.6.0 all-in-one and custom spring app

Flowable Engine
1

Hi,

I recently created a Spring Boot application with Flowable 6.6.0, and in a docker-compose.yml, I started a Postgres DB and flowable-ui.

Before release 6.6.0, it was possible to prevent flowable-task from picking up tasks by disabling the async executor via these properties:

flowable.process.async.executor.enabled=false
flowable.cmmn.async.executor.enabled=false

However, even though I have set them up, I still see in the logs the following line:

2021-03-15 16:22:07.821 INFO 1 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'

And, flowable-task is still picking up tasks.

Analyzing flowable-ui’s image flowable-default.properties, I noticed these properties:

#
# Default Task Executor (will be used for @Async)
#
spring.task.execution.pool.core-size=2
spring.task.execution.pool.max-size=50
spring.task.execution.pool.queue-capacity=10000
spring.task.execution.thread-name-prefix=flowable-ui-task-Executor-

#
# Task scheduling
#
spring.task.scheduling.pool.size=5

Is there a way to disable this task executor?

Many thanks in advance.

2

Hi,

This can be done with flowable.async-executor-activate=false.

See the docs for a complete reference; (section configuration)

Regards,

Yvo

3

Hi @yvo

Thank you very much for you fast reply.

I have added the property you comment, and in the log files, I still see the ‘applicationTaskExecutor’ being initialized.

``2021-03-16 08:06:21.921 INFO 1 — [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService ‘applicationTaskExecutor’.`

For sure I am missing something but I cannot figure it out.

Here is my docker-compose.yml file.

version: '3.7'
services:

  flowable-db:
    image: postgres:12.3
    ports:
      - 5432:5432
    volumes:
      - data_db_test:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=flowable-db
      - POSTGRES_USER=flowable
      - POSTGRES_PASSWORD=flowable
    networks:
      - test-network

  flowable-ui-app:
    image: flowable/flowable-ui
    depends_on:
      - flowable-db
    environment:
      - SERVER_PORT=8080
      - SPRING_DATASOURCE_DRIVER-CLASS-NAME=org.postgresql.Driver
      - SPRING_DATASOURCE_URL=jdbc:postgresql://flowable-db:5432/flowable-db
      - SPRING_DATASOURCE_USERNAME=flowable
      - SPRING_DATASOURCE_PASSWORD=flowable
      - FLOWABLE_COMMON_APP_IDM-ADMIN_USER=admin
      - FLOWABLE_COMMON_APP_IDM-ADMIN_PASSWORD=test
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_PROCESS_SERVER-ADDRESS=http://host.docker.internal
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_PROCESS_PORT=8090
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_PROCESS_CONTEXT-ROOT=/
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_PROCESS_REST-ROOT=process-api
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CMMN_SERVER-ADDRESS=http://host.docker.internal
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CMMN_PORT=8090
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CMMN_CONTEXT-ROOT=/
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CMMN_REST-ROOT=cmmn-api
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_DMN_SERVER-ADDRESS=http://host.docker.internal
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_DMN_PORT=8090
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_DMN_CONTEXT-ROOT=/
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_DMN_REST-ROOT=dmn-api
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_FORM_SERVER-ADDRESS=http://host.docker.internal
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_FORM_PORT=8090
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_FORM_CONTEXT-ROOT=/
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_FORM_REST-ROOT=form-api
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CONTENT_SERVER-ADDRESS=http://host.docker.internal
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CONTENT_PORT=8090
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CONTENT_CONTEXT-ROOT=/
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_CONTENT_REST-ROOT=content-api
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_APP_SERVER-ADDRESS=http://host.docker.internal
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_APP_PORT=8090
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_APP_CONTEXT-ROOT=/
      - FLOWABLE_ADMIN_APP_SERVER-CONFIG_APP_REST-ROOT=app-api
      - FLOWABLE_TASK_APP_KAFKA-ENABLED=false
      - FLOWABLE_TASK_APP_REST-ENABLED=false
      - FLOWABLE_PROCESS_ASYNC_EXECUTOR_ENABLED=false
      - FLOWABLE_CMMN_ASYNC_EXECUTOR_ENABLED=false
      - FLOWABLE_ASYNC-EXECUTOR-ACTIVATE=false
      - FLOWABLE_EXPERIMENTAL_DEBUGGER_ENABLED=true
    ports:
      - 8091:8080
    networks:
      - test-network
    entrypoint: ["./wait-for-something.sh", "flowable-db", "5432", "PostgreSQL", "/flowable-entrypoint.sh"]

  mailhog:
    image: mailhog/mailhog
    ports:
      - 1025:1025
      - 8025:8025
    networks:
      - test-network

volumes:
  data_db_test:

networks:
  test-network:

I am testing a dummy BPMN workflow which only executes a custom delegate. And since the ‘applicationTaskExecutor’ is picking up the jobs, it is throwing this error:

2021-03-16 08:47:25.189 ERROR 1 --- [io-8080-exec-10] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [/flowable-ui] threw exception [Request processing failed; nested exception is org.flowable.common.engine.api.FlowableException: Unknown property used in expression: ${dummyBpmnDelegate}] with root cause

org.flowable.common.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier 'dummyBpmnDelegate'

Here is the BPMN:

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:flowable="http://flowable.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.flowable.org/processdef">
  <process id="dummyBpmnProcessV1" name="Dummy BPMN Process v1" isExecutable="true">
    <startEvent id="startEvent1" flowable:formFieldValidation="true"></startEvent>
    <sequenceFlow id="sid-F49FE376-A49E-4136-8591-31CA504186F5" sourceRef="startEvent1" targetRef="sid-3C62C4AC-8702-455C-BAB4-C5EDC39AB4F1"></sequenceFlow>
    <serviceTask id="sid-3C62C4AC-8702-455C-BAB4-C5EDC39AB4F1" name="Dummy Bpmn Delegate" flowable:delegateExpression="${dummyBpmnDelegate}"></serviceTask>
    <endEvent id="sid-A07555EB-15E6-4FB2-BB01-4D7BD223163E"></endEvent>
    <sequenceFlow id="sid-37933849-81D8-43BD-A5B3-E4AAE4F44F79" sourceRef="sid-3C62C4AC-8702-455C-BAB4-C5EDC39AB4F1" targetRef="sid-A07555EB-15E6-4FB2-BB01-4D7BD223163E"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_dummyBpmnProcessV1">
    <bpmndi:BPMNPlane bpmnElement="dummyBpmnProcessV1" id="BPMNPlane_dummyBpmnProcessV1">
      <bpmndi:BPMNShape bpmnElement="startEvent1" id="BPMNShape_startEvent1">
        <omgdc:Bounds height="30.0" width="30.0" x="100.0" y="163.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-3C62C4AC-8702-455C-BAB4-C5EDC39AB4F1" id="BPMNShape_sid-3C62C4AC-8702-455C-BAB4-C5EDC39AB4F1">
        <omgdc:Bounds height="80.0" width="100.0" x="175.0" y="138.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-A07555EB-15E6-4FB2-BB01-4D7BD223163E" id="BPMNShape_sid-A07555EB-15E6-4FB2-BB01-4D7BD223163E">
        <omgdc:Bounds height="28.0" width="28.0" x="320.0" y="164.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="sid-F49FE376-A49E-4136-8591-31CA504186F5" id="BPMNEdge_sid-F49FE376-A49E-4136-8591-31CA504186F5">
        <omgdi:waypoint x="129.9499984899576" y="178.0"></omgdi:waypoint>
        <omgdi:waypoint x="174.9999999999917" y="178.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-37933849-81D8-43BD-A5B3-E4AAE4F44F79" id="BPMNEdge_sid-37933849-81D8-43BD-A5B3-E4AAE4F44F79">
        <omgdi:waypoint x="274.95000000000005" y="178.0"></omgdi:waypoint>
        <omgdi:waypoint x="320.0" y="178.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

And finally, here is the delegate used in the service task:

@Service("dummyBpmnDelegate")
@Scope("prototype")
@Slf4j
public class DummyBpmnDelegate implements JavaDelegate {
    
    @Override
    public void execute(DelegateExecution execution) {
        log.info("Dummy BPMN Delegate");
    }
}

Once again, thank you very much for the help.

4

Looking at it quickly it seems as your service task isn’t marked as async.
Can you verify this?

5

Yes. That is correct.

And if I mark it as async, my custom Spring App picks up the task.

The same thing happens with a Task Listener. Although, I have not test it by marking the user task as async.

Many thanks for you help @yvo