Reading the VariableTyped POJO from human task of CMMN process

Camunda 7 Topics Discussion & Questions
1

I have created a Rest service to read the variables of a Human Task of a sample CMMN process.

VariableMap variables = Variables.createVariables().putValue(“createdBy”, “user1”)
.putValue(“pojo”, new JavaPojo(“arg1”, “arg2”));
CaseInstance caseInstance = processEngine.getCaseService().createCaseInstanceByKey(“Process_Name1”,variables);
I do have 2 tasks in the CMMN process diagram.Both the human task’s are configured to start manually.
Here the snippet that I am using to start and assign the human task to a user.
processEngine.getCaseService().manuallyStartCaseExecution(caseExecution.getId());
List tasks = processEngine.getTaskService().createTaskQuery().caseExecutionId(caseExecution.getId()).list();
if (tasks.size() > 0) {
selectedTask = tasks.get(0);
}
processEngine.getTaskService().claim(selectedTask.getId(), “demo”);

Till this point things are good.

I would like to edit the process variables for that task and reinject them into process.
For that I tried to get the process varaibles like this.

List tasklist = taskService.createTaskQuery().taskAssignee(“demo”).list();
String createdBy = (String) runtimeService.getVariable(task.getCaseInstanceId(), “createdBy”);

This code snippet is giving me a null pointer exceptions saying “execution id is null”.
I had a look at my mysql schema for the table called “act_ru_task”, there I can see the execution_id_ column as null.

Am I doing right here? How to get the POJO that I have in different human tasks , edit the values and pass as input to other human task?

2

Hi @subbu,

Could you please share the entire stacktrace?

Thanks.

Cheers,
Roman

3

BTW, you have to use for CMMN the CaseService and not the RuntimeService to retrieve the variable from the case instance. So, it should be something like this caseService.getVariable(task.getCaseInstanceId(), "createdBy");.

Cheers,
Roman

4

Hi Roman,
Thanks for the Quick response. using caseService instead of RuntimService Worked well.

Regards,
Subbu

5