How to update process instance variables?

Question

I'm using Camunda Java Api, and i would like to change a process instance variable for a running process, is it possible ?

Yes. If you set a variable in a java delegate, it overwrites the previous value(if any). — NeplatnyUdaj
– NeplatnyUdaj, Commented Apr 3, 2019 at 7:45
but java delegate must be called from a task service. my question is about updating existing variable for all process instance without updating process definition. — Sfayn
– Sfayn, Commented Apr 3, 2019 at 8:28
There's a rest API for variable modification: docs.camunda.org/manual/7.6/reference/rest/process-instance/… So you can check the sources of ProcessInstanceResourceImpl.modifyProcessInstance to see what's going on... basically runtimeService.createProcessInstanceModification(processInstanceId) and then some more code. — NeplatnyUdaj
– NeplatnyUdaj, Commented Apr 3, 2019 at 10:29

Jan Galinski · Accepted Answer · 2019-04-08 11:44:04Z

5

The RuntimeService has a method ‘setVariable’ which can be called with processInstanceId, variableName and value.

You can finde the processInstance by using ‘runtimeService.createProcessInstanceQuery()....’, for example by using the process business key.

edited Apr 8, 2019 at 11:44

answered Apr 3, 2019 at 11:21

Jan Galinski

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Sfayn · Accepted Answer · 2019-04-03 13:03:57Z

4

I finally, find out how to update a variable for all running process instance :

List<ProcessInstance> processInstances =
            runtimeService.createProcessInstanceQuery()
                    .processDefinitionKey(processKey)
                    .active()
                    .list();
    processInstances.forEach(processInstance -> {
        List<Execution> executions = runtimeService.createExecutionQuery()
                .processInstanceId(processInstance.getId())
                .list();
        executions.forEach(execution -> {
            runtimeService.setVariable(execution.getId(), variableName, variableValue);
        });
    });

answered Apr 3, 2019 at 13:03

Sfayn

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2 Comments

Voyager3 Over a year ago

How do you execute this code ? Do you expose it as a REST endpoint ?

Sonic Broccoli Over a year ago

@Voyager3 from java delegate

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