throw new Error in Alfresco workflow

[irenailievska]

I want to throw error in a custom alfreso workflow, but just as a popup message to the user that he entered something wrong.
I tried to do this

<activiti:taskListener event="complete" class="org.alfresco.repo.workflow.activiti.tasklistener.ScriptTaskListener">
          <activiti:field name="script">
            <activiti:string><![CDATA[
            …………………….
            var message = 'IT LIVES';
            throw message;]]></activiti:string>
          </activiti:field>
        </activiti:taskListener>
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I tried doing this also

…
throw new Error("some text");
…
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Since I am writing here it means it didn't work.
Please can somebody help me?
Just a simple alert window doesn't help me if the user submits the action after all. I need something to stop the user from continuing the process if the data he entered is not correct.

Thanks in advance,
Irena

[muralidharand]

ScriptTaskListener code runs in Server and not in the browser side.
So, if you call

 alert('welcome'); ‍

will not show.

[irenailievska]

OK it makes sense… I know that the code runs on server side, just wanted to try anything. Do you perhaps know how to throw an error message (popup) ?

[darkredd]

Hi,

Use the method in this way and it should work:

throw(message)‍

that will throw a popup on your screen.

[irenailievska]

Exception while invoking TaskListener: 00150013 Failed to execute supplied script ….
It looks like that throw expects to get something else. I tried adding message as you suggested but it doesn't work.
I am putting this code inside the workflow definition. Maybe I am supposed to put it somewhere else?

[muralidharand]

Hi,

You have to use

 throw new Error("") ‍

to error message to the user.
Here is the code snippet to throw error message to user.

<serviceTask id="alfrescoScripttask1" name="Validate input params" activiti:class="org.alfresco.repo.workflow.activiti.script.AlfrescoScriptDelegate">
      <extensionElements>
        <activiti:field name="script">
          <activiti:string>
        <![CDATA[if (bpm_package.children.length == 0 )
        {
          throw new Error ("No workflow folder found.Please select one.");
        }
        if (bpm_package.children.length > 1 )
        {
          throw new Error ("More than one workflow attachments found, Please select only one workflow folder.");
        }
]]></activiti:string>
        </activiti:field>
      </extensionElements>
</serviceTask>

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Hope this helps you.

Thanks,
Murali.

[irenailievska]

Does it have to be a service task in order to throw new Error? I tried doing the same thing, but in an User Task.
I need to throw the error when the user makes a choice in the workflow - when he completes a task. This is so in order to not let the user task to continue if the info entered is wrong. So I tried throwing error in the complete event of the user task.
Is this possible?

[darkredd]

Hi,

I use it with a user task, though as a supplied script. I write a separate script and embed it to the user task, that way I do not have to redeploy the bpm every time I make changes.
Try using the "throw" in a independent script.

[muralidharand]

I tested with simple user task and it is working me, means throwing the error message.
If you use the service task, it is failed, I believe , the current task will not be completed and goes back to prev. task. I am not sure what happen if you update some values in the system.

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="myDemoProcess" name="My Demo Process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="User Task" activiti:assignee="admin">
      <extensionElements>
        <activiti:taskListener event="complete" class="org.alfresco.repo.workflow.activiti.tasklistener.ScriptTaskListener">
          <activiti:field name="script">
            <activiti:string><![CDATA[throw new Error ("called");]]></activiti:string>
          </activiti:field>
        </activiti:taskListener>
      </extensionElements>
    </userTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow2" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_myDemoProcess">
    <bpmndi:BPMNPlane bpmnElement="myDemoProcess" id="BPMNPlane_myDemoProcess">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="210.0" y="200.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55.0" width="105.0" x="290.0" y="190.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="440.0" y="200.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="245.0" y="217.0"></omgdi:waypoint>
        <omgdi:waypoint x="290.0" y="217.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="395.0" y="217.0"></omgdi:waypoint>
        <omgdi:waypoint x="440.0" y="217.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>


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[muralidharand]

I haven't tried at the user task completion. Anyway, let me take a look and will come back to you.