The following steps describe how to update the Camunda artifacts on a JBoss AS 7 and Wildfly 8 server in a shared process engine setting. For the entire procedure, refer to the update guide. If not already done, make sure to download the Camunda 7.4 JBoss distribution or Camunda 7.4 Wildfly distribution. In the following instructions $APP_SERVER should be replaced with either jboss or wildfly, depending on the used application server.

The update procedure takes the following steps:

1. Update the Camunda 7 Modules
2. Update Optional Camunda 7 Modules
3. Maintain Process Engine Configuration
4. Maintain Process Applications
5. Update Camunda Web Applications

Whenever the instructions are to replace a module, make sure to delete the previous version of the module first to avoid orphan jars.

1. Update the Camunda 7 Modules

Replace the following modules from the folder $APP_SERVER_HOME/modules/ with their new versions from the folder $APP_SERVER_DISTRIBUTION/modules/:

• org/camunda/bpm/camunda-engine
• org/camunda/bpm/$APP_SERVER/camunda-$APP_SERVER-subsystem
• org/camunda/bpm/model/camunda-bpmn-model
• org/camunda/bpm/model/camunda-cmmn-model
• org/camunda/bpm/model/camunda-xml-model

Add or replace (if already present) the following modules:

• org/camunda/bpm/dmn/camunda-engine-dmn
• org/camunda/bpm/dmn/camunda-engine-feel-api
• org/camunda/bpm/dmn/camunda-engine-feel-juel
• org/camunda/bpm/model/camunda-dmn-model
• org/camunda/commons/camunda-commons-logging
• org/camunda/commons/camunda-commons-typed-values
• org/camunda/commons/camunda-commons-utils

2. Update Optional Camunda 7 Modules

In addition to the core modules, there may be optional artifacts in $APP_SERVER_HOME/modules/ for LDAP integration, Camunda Connect, Camunda Spin, and Groovy scripting. If you use any of these extensions, the following update steps apply:

LDAP Integration

Replace the following modules from the folder $APP_SERVER_HOME/modules/ with their new versions from the folder $APP_SERVER_DISTRIBUTION/modules/, if present:

• org/camunda/bpm/identity/camunda-identity-ldap

Camunda Connect

Replace the following modules from the folder $APP_SERVER_HOME/modules/ with their new versions from the folder $APP_SERVER_DISTRIBUTION/modules/, if present:

• org/camunda/bpm/camunda-engine-plugin-connect

Camunda Spin

Replace the following modules from the folder $APP_SERVER_HOME/modules/ with their new versions from the folder $APP_SERVER_DISTRIBUTION/modules/, if present:

• org/camunda/spin/camunda-spin-core
• org/camunda/spin/camunda-spin-dataformat-json-jackson
• org/camunda/spin/camunda-spin-dataformat-xml-dom
• org/camunda/bpm/camunda-engine-plugin-spin

Groovy Scripting

Replace the following modules from the folder $APP_SERVER_HOME/modules/ with their new versions from the folder $APP_SERVER_DISTRIBUTION/modules/ if present:

• org/codehaus/groovy/groovy-all

3. Maintain Process Engine Configuration

This section describes changes in the engine’s default behavior. While the change is reasonable, your implementation may rely on the previous default behavior. Thus, the previous behavior can be restored for shared process engines by explicitly setting a configuration option.

Task Query Expressions

As of 7.4, the default handling of expressions submitted as parameters of task queries has changed. Passing EL expressions in a task query enables execution of arbitrary code when the query is evaluated. The process engine no longer evaluates these expressions by default and throws an exception instead. This behavior can be toggled in the process engine configuration using the properties enableExpressionsInAdhocQueries (default false) and enableExpressionsInStoredQueries (default true). To restore the engine’s previous behavior, set both flags to true. See the user guide on security considerations for custom code for details. This is already the default for Camunda 7 versions after and including 7.3.3 and 7.2.8.

User Operation Log

The behavior of the user operation log has changed, so that operations are only logged if they are performed in the context of a logged in user. This behavior can be toggled in the process engine configuration using the property restrictUserOperationLogToAuthenticatedUsers (default true). To restore the engine’s prior behavior, i.e., to write log entries regardless of user context, set the flag to false.

Furthermore, with 7.4 task events are only logged when they occur in the context of a logged in user. Task events are accessible via the deprecated API TaskService#getTaskEvents. If you rely on this API method, the previous behavior can be restored by setting the flag restrictUserOperationLogToAuthenticatedUsers to false.

4. Maintain Process Applications

This section describes changes in behavior of API methods that your process applications may rely on.

CMMN Model API

As a consequence of supporting CMMN 1.1, the CMMN model API is now based on the schema of CMMN 1.1. This leads to limitations when editing CMMN 1.0 models. We therefore recommend to migrate your CMMN 1.0 models to CMMN 1.1.

5. Update Camunda Web Applications

Update REST API

The following steps are required to update the Camunda REST API on a JBoss/Wildfly instance:

1. Undeploy an existing web application with a name like camunda-engine-rest
2. Download the REST API web application archive from our Artifact Repository. Alternatively, 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.war.
3. Deploy the web application archive to your JBoss/Wildfly instance.

Update Cockpit, Tasklist, and Admin

The following steps are required to update the Camunda web applications Cockpit, Tasklist, and Admin on a JBoss/Wildfly instance:

1. Undeploy an existing web application with a name like camunda-webapp
2. Download the Camunda web application archive from our Artifact Repository. Alternatively, switch to the private repository for the enterprise version (User and password from license required). Choose the correct version named $PLATFORM_VERSION/camunda-webapp-jboss.war.
3. Deploy the web application archive to your JBoss/Wildfly instance.