Start Process by Disabling Validation

[zohaibjabbar]

Hi,

I am parsing a bpmn file using Activiti and all goes well. However, if I do not define any 'script' in Script Task then bpmn file will not get deployed. I was going through the functions and came across "disableValidation" function. Now when I call this function and deploy the process, then process will not start.

DeploymentBuilder d = repositoryService.createDeployment();
         d.addClasspathResource("bpmnFiles/"+fileName);
         d.disableBpmnValidation();
         Deployment dep = d.deploy();

         runtimeService = processEngine.getRuntimeService();
         processInstance = runtimeService.startProcessInstanceByKey("myProcess");
‍‍‍‍‍‍‍‍‍

A Null Pointer exception is thrown at the last line of code.

java.lang.NullPointerException
   at org.activiti.engine.impl.juel.Scanner.next(Scanner.java:452)
   at org.activiti.engine.impl.juel.Parser.consumeToken(Parser.java:252)
   at org.activiti.engine.impl.juel.Parser.tree(Parser.java:277)
   at org.activiti.engine.impl.juel.Builder.build(Builder.java:95)
   at org.activiti.engine.impl.juel.TreeStore.get(TreeStore.java:61)
   at org.activiti.engine.impl.juel.TreeValueExpression.<init>(TreeValueExpression.java:62)
   at org.activiti.engine.impl.juel.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:428)
   at org.activiti.engine.impl.juel.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:73)
   at org.activiti.engine.impl.scripting.JuelScriptEngine.parse(JuelScriptEngine.java:142)
   at org.activiti.engine.impl.scripting.JuelScriptEngine.eval(JuelScriptEngine.java:86)
   at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233)
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Can I deploy and start the process if no script is available in script task?
My only purpose is to get BpmnModel Object for this xml file.

[zohaibjabbar]

I was getting BpmnModel object using:
<code> BpmnModel model=repositoryService.getBpmnModel(String.valueOf(processInstance.getProcessDefinitionId())); </code>

But Process Instance object is not being initialized if Script Task Element does not contain any script.

Thanks for any help/pointer/suggestion.

[jbarrez]

I'm not really following .. having a script task element doesn't have any influence on this all.
Please post the process definition XML that is causing this.

[zohaibjabbar]

Sorry for not being clear in the first place.

I have attached my bpmn xml file.

The same file get deployed perfectly fine if I just convert the script task to manual task. And after deployment I am able to get process instance from runtime service and then I retrieve bpmn model.

However, with script task, I get the error that no script found. I have also attached the log file. Thanks for the help.

My Process Definition (complete file also attached):
<code>
<?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" xmlnsmgdc="http://www.omg.org/spec/DD/20100524/DC" xmlnsmgdi="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="myProcess" name="myProcess" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="scripttask2"></sequenceFlow>
    <parallelGateway id="parallelgateway1" name="Parallel Gateway"></parallelGateway>
    <sequenceFlow id="flow2" sourceRef="scripttask2" targetRef="parallelgateway1"></sequenceFlow>
    <userTask id="usertask1" name="User Task"></userTask>
    <sequenceFlow id="flow3" sourceRef="parallelgateway1" targetRef="usertask1"></sequenceFlow>
    <callActivity id="callactivity1" name="Call activity"></callActivity>
    <sequenceFlow id="flow4" sourceRef="usertask1" targetRef="callactivity1"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow5" sourceRef="callactivity1" targetRef="endevent1"></sequenceFlow>
    <sequenceFlow id="flow7" sourceRef="parallelgateway1" targetRef="scripttask1"></sequenceFlow>
    <exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"></exclusiveGateway>
    <sequenceFlow id="flow8" sourceRef="scripttask1" targetRef="exclusivegateway1"></sequenceFlow>
    <sequenceFlow id="flow9" sourceRef="exclusivegateway1" targetRef="usertask1"></sequenceFlow>
    <userTask id="usertask2" name="User Task"></userTask>
    <sequenceFlow id="flow10" sourceRef="exclusivegateway1" targetRef="usertask2"></sequenceFlow>
    <endEvent id="endevent2" name="End"></endEvent>
    <sequenceFlow id="flow11" sourceRef="usertask2" targetRef="endevent2"></sequenceFlow>
    <scriptTask id="scripttask1" name="Script Task" activiti:autoStoreVariables="false"></scriptTask>
    <scriptTask id="scripttask2" name="Service Task" activiti:autoStoreVariables="false"></scriptTask>
  </process>
</code>

error:
<code>
2016-03-01 22:12:23 ERROR ActivitiDeployment.<init>:61 - Errors while parsing:
[Validation set: 'activiti-executable-process' | Problem: 'activiti-scripttask-missing-script'] : No script provided for script task - [Extra info : processDefinitionId = myProcess | processDefinitionName = myProcess |  | id = scripttask1 |  | activityName = Script Task | ] ( line: 22, column: 89)
[Validation set: 'activiti-executable-process' | Problem: 'activiti-scripttask-missing-script'] : No script provided for script task - [Extra info : processDefinitionId = myProcess | processDefinitionName = myProcess |  | id = scripttask2 |  | activityName = Service Task | ] ( line: 23, column: 90)

org.activiti.engine.ActivitiException: Errors while parsing:
[Validation set: 'activiti-executable-process' | Problem: 'activiti-scripttask-missing-script'] : No script provided for script task - [Extra info : processDefinitionId = myProcess | processDefinitionName = myProcess |  | id = scripttask1 |  | activityName = Script Task | ] ( line: 22, column: 89)
[Validation set: 'activiti-executable-process' | Problem: 'activiti-scripttask-missing-script'] : No script provided for script task - [Extra info : processDefinitionId = myProcess | processDefinitionName = myProcess |  | id = scripttask2 |  | activityName = Service Task | ] ( line: 23, column: 90)
</code>

In my case I just need to be able to populate bpmn model object using Activiti Parser. The scripts might and might not be present in the Script Task at the time when I need to parse bpmn file.
I also tried disable validation function at the time of deployment but even that did not work for me.

Thanks for the help.

[zohaibjabbar]

I really appreciate any pointer in the right direction.
Please let me know if I can provide any further information.

[jbarrez]

So the exception is clear, you have no script element for the script task, which is invalid.

Disabling the validation should work … how did you try to disable it?

[zohaibjabbar]

Yes, the exception is very clear and thus I disabled the validation while deploying the process (code below). But even after disabling the validation the process won't start executing. For example, even when I have disabled the validation, I cannot get bpmn model object from process instance as process could not be deployed.
<code>
DeploymentBuilder d = repositoryService.createDeployment();
   d.addClasspathResource("bpmnFiles/"+fileName);
   d.disableBpmnValidation();
   Deployment dep = d.deploy();

   runtimeService = processEngine.getRuntimeService();
   processInstance = runtimeService.startProcessInstanceByKey("myProcess");
</code>

Thanks,

[jbarrez]

Okay - and how does your BPMNParseHandler look like where you attach the script?