CODEWITHSUNDEEP
javaactiviti
J-Alex
J-Alex

Reputation: 7117

Activiti candidate group assignment implementation

I'm trying to assign task to candidate group in Activiti following the next scenario: User closes his own task and task have to move forward to candidate group.

In Activiti properties this task has no assignees/candidate groups. I'm adding candidate group to this task in java code:

public void assignTaskToCandidateGroup(Long entityId) {
    ProcessInstance processInstance = super.findProcessInstance(entity);
    Task task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
    if (task != null) {
        taskService.complete(task.getId());
    }

    // Get next task after previos closed and add Candidate group
    task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
    taskService.addCandidateGroup(task.getId(), "candidateGroup");
}

public List<Task> getTaskForCandidateGroup() {
    return taskService.createTaskQuery().taskCandidateGroup("candidateGroup").list();
}

public void claimTaskCandidate(String taskId, User user) {
    Task task = super.findTaskById(taskId);
    List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("candidateGroup").list();

    if (!tasks.contains(task))
        throw new UnsupportedOperationException(String.format("Task with id [%s] is not intended for [%s]",
                task.getId(), "candidateGroup"));

    // ... check services and exception handing omitted

    taskService.claim(task.getId(), user.getUsername());
}

I get the following Exception when calling getTaskForCandidateGroup():

"org.springframework.http.converter.HttpMessageNotWritableException",

"message": "Could not write content: lazy loading outside command context (through reference chain: java.util.ArrayList[0]->org.activiti.engine.impl.persistence.entity.TaskEntity[\"variableInstances\"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: lazy loading outside command context (through reference chain: java.util.ArrayList[0]->org.activiti.engine.impl.persistence.entity.TaskEntity[\"variableInstances\"])", "path": "/teuis-api/workflow-bps06/getTasksDirectorDeputyGroup"

Can someone suggest another solution to implement this task?

Upvotes: 0

Views: 1930

Answers (2)

J-Alex
J-Alex

Reputation: 7117

The problem is solved.

I've tried to call the service and return List directly, but it was cause of the error.

@RequestMapping(value = "/getTaskForCandidateGroup")
public List<Task> getTaskForCandidateGroup() {
    return getTaskForCandidateGroup();
}

New method: 

@RequestMapping(value = "/getTaskForCandidateGroup")
public List<Map<String, Object>> getTaskForCandidateGroup() {
List<Tasks> taskList = getTaskForCandidateGroup();

List<Map<String, Object>> customTaskList = new ArrayList<>();
    for (Task task : taskList) {
        Map<String, Object> map = new LinkedHashMap<>();
        map.put("taskId", task.getId());
        map.put("taskDefinitionKey", task.getTaskDefinitionKey());
        map.put("taskName", task.getName());

        customTaskList.add(map);
    }
    return customTaskList;

Upvotes: 2

Greg Harley
Greg Harley

Reputation: 3240

Use a listener associated with the assign event. Assign is executed before create specifically to handle this scenario.

Upvotes: 0

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