Batch executeAsync does not start

Camunda 7 Topics Discussion & Questions
1

Hi,
I am trying to migrate few process instances from one version to another using migration plan

In java code when I use execute() method then it is done immediately.
runtimeService.newMigration(migrationPlan) .processInstanceQuery(processQuery).execute();

But When I use executeAsync() method then I see the batch job waiting in the batches section but does not complete.

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Can someone tell me what is the problem? I saw the question but did not find any solution Migration batch does not complete

I created a sample code which uses camunda 7.15.0 and can recreate the issue:-

This requires Postgres database. The database credentials need to be configured in application.yml file

mvn clean install
start the springboot application

http://localhost:1234/create-item - to start the camunda process which will just create an incident

http://localhost:1234/migrate/fromId/{fromProcessDefId}/toId/{toProcessDefId} - try to move the process instance from one process definition version to another

2

I’m using the excuteAsync() method which works fine for me, already with Camunda 7.6., an my code looks quite similar.

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ProcessEngineService processEngineService = BpmPlatform.getProcessEngineService();
ProcessEngine processEngine = processEngineService.getDefaultProcessEngine();
MigrationPlan migrationPlan = processEngine.getRuntimeService().createMigrationPlan( processDefinitionBefore.getId(), processDefinitionAfter.getId() ).mapEqualActivities().build();
ProcessInstanceQuery processInstanceQuery = this.runtimeService.createProcessInstanceQuery().processDefinitionId( migrationPlan.getSourceProcessDefinitionId() );
List<ProcessInstance> instances = processInstanceQuery.list();
List<String> instanceIds = new ArrayList<>();
if ( !instances.isEmpty() ) {
    ArrayList<String> messages = new ArrayList<>();
    messages.add( String.format( Locale.GERMANY, "Starte Prozess-Instanz-Migration für %,d Instanzen.", Integer.valueOf( instances.size() ) ) );
    this.infoMessage( TASKS.BPT_DEPLOY_FILES, messages );

    messages.clear();
    messages.add( "Starte Prozess-Instanz-Migration für folgende ID's:" );
    for ( ProcessInstance processInstance : instances ) {
        messages.add( "- " + processInstance.getId() );
        instanceIds.add( processInstance.getId() );
    }
    this.debugMessage( TASKS.BPT_DEPLOY_FILES, messages );

    this.runtimeService.newMigration( migrationPlan ).processInstanceIds( instanceIds ).executeAsync();
}
3

Yes code looks similar… I think I am doing something wrong in dependencies or something I am not sure. I still could not find the issue in the repository link I shared GitHub - firstpostt/camunda-demo-migration

4

Found the problem

I was using unique constraint in postgres Database | docs.camunda.org

Then camunda batch is not working properly sometimes. I am not able to recreate the issue consistently but it has something to do with the unique constraint

5

I deleted the database and created it again from scratch. Then it works fine

6