While trying to update the process instance description via a script task inside process definition, the updated value is not getting reflected immediately.

((org.jbpm.process.instance.impl.ProcessInstanceImpl)kcontext.getProcessInstance()).setDescription("updated::" + kcontext.getVariable("pid"));

Although the updated value is printed if we fetch "kcontext.getProcessInstance().getDescription()", but this updated value is not refleted in business-central UI or fetched with REST API.

GET /kie-server/services/rest/server/queries/processes/instances/1

Update value is only reflected after the process is completed or aborted.

Sharing the reproducer for reference.

solution

using a description based on process variables e.g:

update::#{pid}

where pid is a process variable.
Add the Tag process_description to pid.

Anytime the variable pid is changed the description of the process will be flushed to the ProcessInstanceLog