Camunda Platform 7.13

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Update from 7.11 to 7.12

This document guides you through the update from Camunda Platform 7.11.x to 7.12.0. It covers these use cases:

  1. For administrators and developers: Database Updates
  2. For administrators and developers: Full Distribution Update
  3. For administrators: Standalone Web Application
  4. For developers: Spring Boot Starter Update
  5. For developers: External Task Client Update
  6. For developers: Security-related HTTP Headers (Webapps)
  7. For developers: Camunda Commons Typed Values Migration
  8. For developers: Camunda DMN Engine Migration
  9. For developers: Task Lifecycle State and Task Events
  10. For administrators and developers: PostgreSQL Support Clarification

This guide covers mandatory migration steps as well as optional considerations for the initial configuration of new functionality included in Camunda Platform 7.12.

Database Updates

Every Camunda installation requires a database schema update.

Procedure

  1. Check for available database patch scripts for your database that are within the bounds of your update path. Locate the scripts at $DISTRIBUTION_PATH/sql/upgrade in the pre-packaged distribution (where $DISTRIBUTION_PATH is the path of an unpacked distribution) or in the Camunda Nexus. We highly recommend executing these patches before updating. Execute them in ascending order by version number. The naming pattern is $DATABASENAME_engine_7.11_patch_?.sql.

  2. Execute the corresponding update scripts named

    • $DATABASENAME_engine_7.11_to_7.12.sql

    The scripts update the database from one minor version to the next, and change the underlying database structure. So make sure to backup your database in case there are any failures during the update process.

  3. We highly recommend to also check for any existing patch scripts for your database that are within the bounds of the new minor version you are updating to. Execute them in ascending order by version number. Attention: This step is only relevant when you are using an enterprise version of the Camunda Platform, e.g., 7.12.X where X > 0. The procedure is the same as in step 1, only for the new minor version.

Full Distribution

This section is applicable if you installed the Full Distribution with a shared process engine.

The following steps are required:

  1. Update the Camunda libraries and applications inside the application server
  2. Migrate custom process applications

Before starting, make sure that you have downloaded the Camunda Platform 7.12 distribution for the application server you use. It contains the SQL scripts and libraries required for the update. This guide assumes you have unpacked the distribution to a path named $DISTRIBUTION_PATH.

Camunda Libraries and Applications

Please choose the application server you are working with from the following list:

Custom Process Applications

For every process application, the Camunda dependencies should be updated to the new version. Which dependencies you have is application- and server-specific. Typically, the dependencies consist of any of the following:

  • camunda-engine-spring
  • camunda-engine-cdi
  • camunda-ejb-client
  • …

There are no new mandatory dependencies for process applications.

Standalone Web Application

If the standalone web application is in use, the current war artifact must be replaced by its new version.

If a database other than the default H2 database is used, the following steps must be taken:

  1. Undeploy the current version of the standalone web application
  2. Update the database to the new schema as described in the database update section
  3. Reconfigure the database as described in the installation section
  4. Deploy the new and configured standalone web application to the server

Spring Boot Starter Update

If you are using Camunda Spring Boot Starter within you Spring Boot application, then you need to:

  1. Check Version Compatibility Matrix
  2. Update Spring Boot Starter and, when required, Spring Boot versions in your pom.xml.
  3. Update the Camunda Platform version in your pom.xml in case you override it before (e.g., when using the enterprise version or a patch releases)

External Task Client Update

If you are using the Camunda External Task Client, please make sure to:

  1. Check out the Version Compatibility Matrix
  2. Update the version in your pom.xml (Java) or package.json (NodeJs)

Security-related HTTP Headers (Webapps)

In this release, we introduced the following HTTP response headers in the web applications which are available by default:

  • Content Security Policy (Content-Security-Policy)
  • Content-Type Options (X-Content-Type-Options)

Please see the documentation about the HTTP Header Security to learn more about the several headers, the defaults, and how to configure or even disable them according to your needs.

Camunda Commons Typed Values Migration

Starting with version 7.12, the camunda-commons-typed-values library has been migrated into the camunda-bpm-platform repository.

The changes include:

  • The library version has changed from Camunda Commons (currently at 1.8.0) to the Camunda Platform version (7.12.0). You can find the new Maven coordinates below: 
<dependency>
  <groupId>org.camunda.commons</groupId>
  <artifactId>camunda-commons-typed-values</artifactId>
  <version>7.12.0</version>
</dependency>
  • The library isn’t part of the camunda-commons-bom anymore. Now, it is directly part of the camunda-bom. Users that are importing the camunda-commons-bom now need to either replace the import with the camunda-bom, or, explicitly declare the library version as described above.
  • When updating the camunda-commons-typed-values library on a Container-Managed Process Engine, the new camunda-commons-typed-values artifact name contains the Camunda Platform version.

Camunda DMN Engine Migration

The Camunda DMN Engine is another migration to the camunda-bpm-platform repository happening in version 7.12.0. The DMN Engine migration doesn’t require any adjustments. However, any contributions to the DMN Engine needs to be addressed to the camunda-bpm-platform repository.

Task Lifecycle State and Task Events

The 7.12.0 release provides a more defined User Task lifecycle. This impacts the order in which Task events are fired. Previously, when the process execution arrived in a User Task, the assignment event was fired before the create event (if an assignee was set). With the new Task lifecycle, if an assignee is explicitly set on the User Task an assignment event is fired after the create event is fired.

Any create Task Listeners that depend on the execution of an assignment Task Listener need to be adjusted. The same goes for assignment Task Listeners that hold the assumption that they are the first to execute. They need to be adjusted to consider that create Task Listeners are executed before them.

Furthermore, assignment Task Listeners will no longer be triggered through an assignment within another Task Listener. Those that hold this assumption need to be adjusted, with this limitation in mind, by explicitly performing an assignment through the TaskService.

PostgreSQL Support Clarification

According to the PostgreSQL versioning documentation, the PostgreSQL versioning scheme changed from PostgreSQL 10. For versions before PostgreSQL 10, a major version was marked by the first two version numbers, e.g. 9.4, 9.6. From PostgreSQL 10, a major version is marked by a single version number, e.g. 10, 11.

As this was only a change to the versioning scheme, the content of the minor releases (e.g. 9.4.6, 9.6.18, 10.13, 11.2, etc.) didn’t change. Therefore, we have updated the Camunda Supported Environments, to reflect that Camunda supports all the minor version updates of a major PostgreSQL version.

Note that this adjustment doesn’t change the supported versions of Amazon Aurora PostgreSQL. This is a database service built on top of PostgreSQL, and as such, needs to be tested for support separately from PostgreSQL.

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