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Upgrade Process Services

You can upgrade from earlier versions to Process Services.

Note: Before upgrading, you should back up your database and properties files, such as activiti-app.properties.

There are two methods for upgrading:

  • Using the Process Services setup wizard
  • Manually

Important: If you integrate Process Services with Alfresco Content Services then be aware that from version 1.11 only repositories on version 5.2 and later are supported. Upgrade to a later version of Alfresco Content Services before updating Process Services to continue using this functionality.

Upgrade using a setup wizard

You can use the Process Services setup wizard to upgrade to the latest version. The process is similar to installing for the first time.

Follow these steps to upgrade:

  1. Double-click the Process Services setup wizard.
  2. Follow the instructions to install the latest version of Process Services.
  3. After the installation is complete, copy the activiti.lic file to the Process Services installation directory: <Install>/tomcat/lib folder.

Alternatively, copy the license to your home directory using the terminal (OSX) or command prompt (Windows):

~/.activiti/enterprise-license/
C:\.activiti\enterprise-license

Tip: You can also upload a license from the user interface.

Upgrade manually

You can upgrade using the WAR file in your application server distribution. These instructions use the WAR file from the Apache Tomcat based distribution, however you can choose from different distributions for various application servers.

Review the Supported Stacks list to see what’s supported.

Follow these steps to upgrade using the War file:

  1. Stop the web server running the application.
  2. Deploy the new WAR file in your web server by placing it in the /webapps folder in Tomcat.
  3. Boot up the web server and start Process Services to check if it’s working as expected.

Any database upgrade changes should have now been applied.

Upgrading from 1.x to 2.x

When you upgrade from APS 1.x to 2.x you are upgrading from Activiti 5.x to 7. There are breaking changes that you need to be aware of in order for your system to function correctly after you have upgraded.

Note: You do not need to migrate your database when upgrading from 1.x to 2.x.

Alfresco Process Services breaking changes

PVM classes

All classes from the org.activiti.engine.impl.pvm package and subpackages have been removed. This is because the _PVM_ (Process Virtual Machine) model has been removed and replaced by a simpler and more lightweight model. This means that ActivitiImpl, ProcessDefinitionImpl, ExecutionImpl, TransitionImpl are invalid.

Generally, most of the usage of these classes in version 5 came down to getting information that was contained in the process definition. In version 6, all the process definition information can be found through the BpmnModel, which is a Java representation of the BPMN 2.0 XML for the process definition (enhanced to make certain operations and searches easier).

The quickest way to get the BpmnModel for a process definition is to use the org.activiti.engine.impl.util.ProcessDefinitionUtil class:

—java // The whole model ProcessDefinitionUtil.getBpmnModel(String processDefinitionId); // Only the specific process definition ProcessDefinitionUtil.getProcess(String processDefinitionId); —

ActivityExecution is replaced by DelegateExecution

We removed ActivityExecution and replaced it where used with the DelegateExecution class.

All methods from the ActivityExecution class are copied to the DelegateExecution class.

Job, timer, suspended and dead letter jobs

Activiti 5 had only 1 job table and this meant that a fairly complex query had to be executed to get the jobs that needed to be executed from the database.

From Activiti 6, the jobs have been split up in a job ACT_RU_JOB, timer ACT_RU_TIMER_JOB, suspended ACT_RU_SUSPENDED_JOB, and ACT_RU_DEADLETTER_JOB dead letter table.

Note: It’s important to complete all pending jobs before upgrading from APS 1.x to APS 2.

Signaling an execution

In Activiti 6, the signal() methods have been renamed to trigger().

This also means that SignalableActivityBehavior, the interface to be implemented for behaviors that can be triggered from external sources, is now called TriggerableActivityBehavior.

Checked Exceptions

In version 5, the delegate classes like JavaDelegate and ActivityBehavior had throws Exception in their signature. As with any modern framework, the use of checked Exceptions has been removed in version 6.

Delegate classes

org.activiti.engine.impl.pvm.delegate.ActivityBehavior has changed package and lives now in org.activiti.engine.impl.delegate.

The method getEngineServices() have been removed from DelegateExecution. It’s possible to retrieve services like RepositoryService from org.activiti.engine.impl.context.Context using Context.getProcessEngineConfiguration().getRepositoryService().

Identity management classes removed

In Activiti 7, the package org.activiti.engine.identity and all it’s classes like User and Group were removed. While the classes have been removed the database tables like ACT_ID_USER and ACT_ID_GROUP will not be removed when upgrading from APS 1.x to APS 2. However, they’ll not be created if you start APS 2 on a new database.

Alfresco Process Services third-party breaking changes

The following are third party breaking changes that have occured.

  • Spring framework upgraded from 4.x to 5
  • Spring boot upgraded from 1.x to 2
  • Hibernate upgraded from 4.x to 5

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