Workers stop working

Camunda 7 Topics Discussion & Questions
1

Time ago I setup a camunda-bpmn engine via docker. Starting the composer-file I added the following configuration-line to the camunda-configs:

<property name="jobExecutorActivate">true</property>

Unfortunalty I run into two failures:

  1. The Workers don’t pull up any ServiceTasks (http-connector). It seems that they suddenly stop working
  2. After some time the engine responds with an “500”-Error Code Error in persistance layer

I connected into the container to have a look into the log files, but can’t find any error logs.

Do I need to configure camunda to write error logs? What can I do, to find (and fix) the root cause?

following my current composer-file:

version: "3"

services:
  camunda:
    image: camunda/camunda-bpm-platform:7.16.0-alpha5
    environment:
      - DB_DRIVER=com.mysql.cj.jdbc.Driver
      - DB_URL=jdbc:mysql://mysql:3306/process-engine?sendFractionalSeconds=false
      - DB_USERNAME=camunda
      - DB_PASSWORD=camunda
      - WAIT_FOR=mysql:3306
    links:
      - mysql
    ports:
      - "8080:8080"
    restart: unless-stopped
    volumes:
      - $PWD/bpm-platform.xml:/camunda/conf/bpm-platform.xml

  mysql:
    image: mysql:5.7
    environment:
      - MYSQL_ROOT_PASSWORD=camunda
      - MYSQL_USER=camunda
      - MYSQL_PASSWORD=camunda
      - MYSQL_DATABASE=process-engine
    ports:
      - "3306:3306"

and the configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<bpm-platform xmlns="http://www.camunda.org/schema/1.0/BpmPlatform" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.camunda.org/schema/1.0/BpmPlatform http://www.camunda.org/schema/1.0/BpmPlatform ">

  <job-executor>
    <job-acquisition name="default" />
  </job-executor>

  <process-engine name="default">
    <job-acquisition>default</job-acquisition>
    <configuration>org.camunda.bpm.engine.impl.cfg.StandaloneProcessEngineConfiguration</configuration>
    <datasource>java:jdbc/ProcessEngine</datasource>

    <properties>
      <property name="history">full</property>
      <property name="databaseSchemaUpdate">true</property>
      <property name="authorizationEnabled">true</property>
      <property name="jobExecutorDeploymentAware">true</property>
      <property name="historyCleanupBatchWindowStartTime">00:01</property>
      <property name="jobExecutorActivate">true</property>
    </properties>

    <plugins>
      <!-- plugin enabling Process Application event listener support -->
      <plugin>
        <class>org.camunda.bpm.application.impl.event.ProcessApplicationEventListenerPlugin</class>
      </plugin>

      <!-- plugin enabling integration of camunda Spin -->
      <plugin>
        <class>org.camunda.spin.plugin.impl.SpinProcessEnginePlugin</class>
      </plugin>

      <!-- plugin enabling connect support -->
      <plugin>
        <class>org.camunda.connect.plugin.impl.ConnectProcessEnginePlugin</class>
      </plugin>

    <!-- LDAP CONFIGURATION -->
    <!-- Uncomment this section in order to enable LDAP support for this process engine -->
    <!-- Adjust configuration, see ( http://docs.camunda.org/latest/guides/user-guide/#process-engine-identity-service-the-ldap-identity-service ) -->
    <!--
      <plugin>
        <class>org.camunda.bpm.identity.impl.ldap.plugin.LdapIdentityProviderPlugin</class>
        <properties>

          <property name="serverUrl">ldaps://localhost:4334/</property>
          <property name="acceptUntrustedCertificates">false</property>
          <property name="managerDn">uid=jonny,ou=office-berlin,o=camunda,c=org</property>
          <property name="managerPassword">s3cr3t</property>

          <property name="baseDn">o=camunda,c=org</property>

          <property name="userSearchBase"></property>
          <property name="userSearchFilter">(objectclass=person)</property>

          <property name="userIdAttribute">uid</property>
          <property name="userFirstnameAttribute">cn</property>
          <property name="userLastnameAttribute">sn</property>
          <property name="userEmailAttribute">mail</property>
          <property name="userPasswordAttribute">userpassword</property>

          <property name="groupSearchBase"></property>
          <property name="groupSearchFilter">(objectclass=groupOfNames)</property>
          <property name="groupIdAttribute">cn</property>
          <property name="groupNameAttribute">cn</property>

          <property name="groupMemberAttribute">member</property>
          <property name="sortControlSupported">false</property>

        </properties>
      </plugin>
      -->

      <!-- LDAP CONFIGURATION -->
      <!-- The following plugin allows you to grant administrator authorizations to an existing LDAP user -->
      <!--
      <plugin>
        <class>org.camunda.bpm.engine.impl.plugin.AdministratorAuthorizationPlugin</class>
        <properties>
          <property name="administratorUserName">admin</property>
        </properties>
      </plugin>
      -->
    </plugins>
  </process-engine>
</bpm-platform>
2

If you could share where you downloaded docker image and composer file, it will help us to troubleshoot.