Update a Tomcat Installation from 7.1 to 7.2

The following steps describe how to upgrade the Camunda artifacts on a Tomcat server in a shared process engine setting. For the entire migration procedure, refer to the migration guide. If not already done, make sure to download the Camunda BPM 7.2 Tomcat distribution.

The upgrade procedure takes the following steps:

  1. Upgrade the Camunda BPM core libraries
  2. Upgrade and configure optional Camunda BPM libraries (optional)
  3. Configure process engines
  4. Upgrade Camunda web applications

In each of the following steps, the identifiers $*_VERSION refer to the current version and the new versions of the artifacts.

1. Upgrade the Camunda BPM Core Libraries

Replace the following libraries in the folder $TOMCAT_HOME/lib/ with their new versions from the folder $TOMCAT_DISTRIBUTION/lib/:

  • camunda-engine-$PLATFORM_VERSION.jar
  • camunda-bpmn-model-$PLATFORM_VERSION.jar
  • camunda-xml-model-$PLATFORM_VERSION.jar
  • mybatis-$MYBATIS_VERSION.jar

If present, also replace the following optional artifact:

  • camunda-identity-ldap-$PLATFORM_VERSION.jar

Add the following libraries from the folder $TOMCAT_DISTRIBUTION/lib/ to the folder $TOMCAT_HOME/lib/:

  • camunda-cmmn-model-$PLATFORM_VERSION.jar

If present, remove the following artifacts:

  • camunda-engine-cdi-$PLATFORM_VERSION.jar
  • camunda-engine-rest-$PLATFORM_VERSION-classes.jar
  • camunda-engine-spring-$PLATFORM_VERSION.jar

Note: The libraries camunda-engine-spring-$PLATFORM_VERSION.jar and camunda-engine-spring-$PLATFORM_VERSION.jar should be part of application deployments and therefore not in the global library folder. Make sure your process applications bundle these libraries when you remove them from the global folder.

2. Upgrade and Configure Optional Camunda BPM Libraries

In addition, there are artifacts for Camunda Connect, Camunda Spin, the Freemarker template language and Groovy scripting that may optionally be added to the folder $TOMCAT_HOME/lib/. Since all these artifacts add new functionality, the following steps are not required for migration.

Camunda Connect

If Camunda Connect is intended to be used, add the following artifacts:

  • camunda-connect-connectors-all-$CONNECT_VERSION.jar
  • camunda-connect-core-$CONNECT_VERSION.jar
  • camunda-engine-plugin-connect-$PLATFORM_VERSION.jar
  • camunda-commons-logging-$COMMONS_VERSION.jar
  • camunda-commons-utils-$COMMONS_VERSION.jar
  • slf4j-api-$SLF4J_VERSION.jar

In order to activate Camunda Connect functionality for a process engine, a process engine plugin has to be registered in $TOMCAT_HOME/conf/bpm-platform.xml as follows:

<?xml version="1.0" encoding="UTF-8"?>
<bpm-platform ... >
  <process-engine name="default">
    ...
    <plugins>
      ... existing plugins ...
      <plugin>
        <class>org.camunda.connect.plugin.impl.ConnectProcessEnginePlugin</class>
      </plugin>
    </plugins>
    ...
  </process-engine>

</bpm-platform>

Camunda Spin

If Camunda Spin is intended to be used, add the following artifacts:

  • camunda-spin-dataformat-all-$SPIN_VERSION.jar
  • camunda-spin-core-$SPIN_VERSION.jar
  • camunda-engine-plugin-spin-$PLATFORM_VERSION.jar
  • camunda-commons-logging-$COMMONS_VERSION.jar
  • camunda-commons-utils-$COMMONS_VERSION.jar
  • slf4j-api-$SLF4J_VERSION.jar

In order to activate Camunda Spin functionality for a process engine, a process engine plugin has to be registered in $TOMCAT_HOME/conf/bpm-platform.xml as follows:

<?xml version="1.0" encoding="UTF-8"?>
<bpm-platform ... >
  ...
  <process-engine name="default">
    ...
    <plugins>
      ... existing plugins ...
      <plugin>
        <class>org.camunda.spin.plugin.impl.SpinProcessEnginePlugin</class>
      </plugin>
    </plugins>
    ...
  </process-engine>
  ...
</bpm-platform>

Groovy Scripting

If Groovy is to be used as a scripting language, add the following artifacts:

  • groovy-all-$GROOVY_VERSION.jar

Freemarker Integration

If the Camunda integration for Freemarker is intended to be used, add the following artifacts:

  • camunda-template-engines-freemarker-$TEMPLATE_VERSION.jar
  • freemarker-2.3.20.jar
  • camunda-commons-logging-$COMMONS_VERSION.jar
  • camunda-commons-utils-$COMMONS_VERSION.jar
  • slf4j-api-$SLF4J_VERSION.jar

3. Configure Process Engines

Script Variable Storing

As of 7.2, the default behavior of script variables has changed. Script variables are set in e.g. a BPMN Script Task that uses a language such as JavaScript or Groovy. In previous versions, the process engine automatically stored all script variables as process variables. Starting with 7.2, this behavior has changed and the process engine does not automatically store script variables any longer. You can re-enable the legacy behavior by setting the boolean property autoStoreScriptVariables to true for any process engine in the bpm-platform.xml:

<?xml version="1.0" encoding="UTF-8"?>
<bpm-platform ... >
  ...
  <process-engine name="default">
    ...
    <properties>
      ... existing properties ...
      <property name="autoStoreScriptVariables">true</property>
    </properties>
    ...
  </process-engine>
  ...
</bpm-platform>

As an alternative, process application developers can migrate script code by replacing all implicit declarations of process variables in their scripts with an explicit call to execution.setVariable('varName', 'value').

4. Upgrade Camunda Web Applications

Upgrade Camunda REST API

The following steps are required to upgrade the camunda REST API on a Tomcat instance:

  1. Undeploy an existing web application with a name like camunda-engine-rest
  2. Download the REST API web application archive from our Maven Nexus Server. Or switch to the private repository for the enterprise version (User and password from license required). Choose the correct version named $PLATFORM_VERSION/camunda-engine-rest-$PLATFORM_VERSION-tomcat.war.
  3. Deploy the web application archive to your Tomcat instance.

Upgrade Camunda Cockpit, Tasklist, and Admin

The following steps are required to upgrade the camunda web applications Cockpit, Tasklist, and Admin on a Tomcat instance:

  1. Undeploy an existing web application with a name like camunda-webapp
  2. Download the Camunda web application archive from our Maven Nexus Server. Or switch to the private repository for the enterprise version (User and password from license required). Choose the correct version named $PLATFORM_VERSION/camunda-webapp-tomcat-$PLATFORM_VERSION.war.
  3. Deploy the web application archive to your Tomcat instance.

LDAP Entity Caching

With 7.2, it is possible to enable entity caching for Hypertext Application Language (HAL) requests that the camunda web applications make. This can be especially useful when you use camunda in combination with LDAP. To activate caching, the camunda webapp artifact has to be modified and the pre-built application cannot be used as is. See the REST Api Documentation for details.

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