candidateGroup null not accepted.

shiva_arunachal — Tue, 05 May 2015 11:38:40 GMT

I have an application with a user task, <userTask id="usertask1" name="User Task" activiti:assignee="${assigneeName}" activiti:candidateGroups="${candidateGroup}">‍‍‍My scenario is that from my UI, i will enter either assigneeName (or) candidateGroup but not both. If i enter candidate group an

Re: candidateGroup null not accepted.

shiva_arunachal — Tue, 05 May 2015 13:59:52 GMT

In<code> UserTaskActivityBehavior.java</code> assigneeValue is initialized to null because of which it works fine. Similarly why is null value not allowed for groupId ? why is exception thrown if value is null?
<blockcode>
if (taskDefinition.getAssigneeExpression() != null) {
      Object assigneeExpressionValue = taskDefinition.getAssigneeExpression().getValue(execution);

String assigneeValue = null;

      if (assigneeExpressionValue != null) {
        assigneeValue = assigneeExpressionValue.toString();
      }
      task.setAssignee(assigneeValue, true, false);
    }
    </blockcode>

    <blockcode>
if (!taskDefinition.getCandidateGroupIdExpressions().isEmpty()) {
      for (Expression groupIdExpr : taskDefinition.getCandidateGroupIdExpressions()) {
        Object value = groupIdExpr.getValue(execution);
        if (value instanceof String) {
          List<String> candidates = extractCandidates((String) value);
          task.addCandidateGroups(candidates);
        } else if (value instanceof Collection) {
          task.addCandidateGroups((Collection) value);
        } else {

//why is exception thrown here? can't the "value" be null?
throw new ActivitiIllegalArgumentException("Expression did not resolve to a string or collection of strings"); // line num:179

        }
      }
    }    </blockcode>

Re: candidateGroup null not accepted.

jbarrez — Thu, 07 May 2015 13:07:23 GMT

when you use the candidateGroup="" in the xml, it expects that something is filled in. When a task is assigned to someone, the group cannot pick it anymore. Set the assignee to null to 'give it back to the group'

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candidateGroup null not accepted.

Re: candidateGroup null not accepted.

Re: candidateGroup null not accepted.