Hi to all.
When I click to submit my task form in Tasklist, I see the following server error:
An error happened while submitting the task form : SPIN/JACKSON-JSON-01004 Unable to find ‘myList’
To be more specific, “myList” is a defined variable (in which I’ve saved a created JSON Array) in my Script Task.
For more detail I attach here a screenshot of my bpmn diagram and my server log file:
catalina.2018-09-04.log (68.2 KB)
Thank you in advance,
Steve
Hi @steftriant
I suspect you define collection property of Select from the list of products task to ${myList}. Try ${myList.elements()}. If it does not help you please upload bpmn definition.
Hi @Kikol.
Thanks for your feedback 
I am going to try your suggestion but I have a question here.
In Collection field of Select from the list of products Multi-Instance Task I had already defined this expression:
${assignees.prop(‘representatives’).elements()}
, where “representatives” is the collection in which I’ve injected the “myList” variable at the Script Task.
So, do you know how could I define the above expression in Collection field?
Thanks,
Steve
Sorry but I do not understand what you do. Representatives should represent your collection and I do not know where do you inject myList variable. Could you upload your diagram?
Hi @Kikol.
Please let me explain my process scenario:
In the 1st user task (Create a list of products), the assignee user (who is the Central Administrator here) creates (via camForm function) a JSON Array named product.
On the submission of the 1st task form I want to automatically assign 1 instance of the User Task (Select from the list of products), to each user of the group Representatives.
So, in the Script Task (Create a list of users), I’ve written the following inline script:
var myList = product
var representatives = {"myList" : myList}
var mySpin = S(JSON.stringify(representatives));
execution.setVariable('assignees', mySpin.prop('myList').elements());
JSON Array product is saved into the variable myList.
myList variable is then injected into a collection variable named representatives.
In the Multi-Instance user task (Select from the list of products), a group of 27 users (with the role Representative) have to select from the same list (array) of products.
2 screenshots from my Multi-Instance User Task Properties Panel:
I also uploaded my bpmn file in case you want to check sth:
example.bpmn (5.4 KB)
Thanks a lot for your help,
Steve
Hi @steftriant ,
I’m not sure I understand what you want to achieve. Your script task simple creates a mySpin variable which is a simple collection of products, nothing else. So, you have to set collection property of multi instance task to ${assignees}. Then collection element (assignee) represents an instance of product created within first user task.
Hi @Kikol.
Thanks for your feedback.
The only thing that I want to achieve here is to automatically assign 1 only instance from the Multi-Instance User Task (Select from the list of products) to each one of the users who belong to the same group (Representatives in my process).
I tried anything you said but whenever I try to submit the 1st task form (Create a list of products), I always take the same server error message: SPIN/JACKSON-JSON-01004 Unable to find 'myList’ 
Steve
Hi @steftriant
Sorry, I focus on multi instance task . Your variable myList must be defined as a list. I replace your script as follows(and remove form references)
var myList = ["product1","product2","product3"]
var representatives = {"myList" : myList}
var mySpin = S(JSON.stringify(representatives));
execution.setVariable('assignees', mySpin.prop('myList').elements());
Only first line is changed:
var myList = product
I do not know that product means here. If this is a function then it which should return an array. If this is a process variable set by form then you should read it using execution.getVariable method.
Hi @Kikol.
Let me attach here the script from my 1st html task form in order to understand the meaning of product .
<script cam-script type="text/form-script">
var product = $scope.product = []; // Custom JavaScript creates a JavaScript Object and binds it to the current AngularJS $scope of the form as a variable named "product".
$scope.addProduct = function () { // We make a function named "addProduct".
var product = {}; // We add a new "product" to the Array.
product.Category = $scope.Category;
product.Description = $scope.Description;
if (!!$scope.camForm.fields[0].element[0].files[0]) { // If the file is uploaded,
product.Details = $scope.camForm.fields[0].element[0].files[0].name; // it returns file's "name".
} else { // If the file is not uploaded,
return; // it returns "undefined".
}
product.Price = $scope.Price;
$scope.product.push(product); // We use the value of the "product" input field to add a new "product" to the Array.
$scope.Category = ""; // We clear the TextBox "Κατηγορία".
$scope.Description = ""; // We clear the TextBox "Περιγραφή".
$scope.Details = ""; // We clear file's "name".
$scope.Price = ""; // We clear the TextBox "Τιμή (€)".
};
$scope.removeProduct = function (index) { // We make a function named "removeProduct".
var category = $scope.product[index].Category; // We find product's "Category" using "index" from the Array and binds it to the current AngularJS $scope of the form as a variable named "category".
$scope.product.splice(index, 1); // We use an "index" to remove a "product" from the Array.
}
$scope.isAddFormValid = function () { // We make a function named "isAddFormValid".
return ($scope.Category &&
$scope.Description &&
$scope.camForm.fields[0].element[0].files[0] &&
$scope.Price) ? true : false; // If all of the 4 input fields of variable "product" are filled in, the "isAddFormValid" function (expression) returns "true", otherwise the function returns "false".
}
camForm.on('form-loaded', function() { // We hook into the lifecycle of Camunda SDK JS Form.
camForm.variableManager.createVariable ({ // We "create" (declare) a new "process variable"
name:'product', // named 'product' and
type:'json', // provide as type information 'json' used for serialization.
value:product
});
});
camForm.on('submit', function(evt) { // We hook into the lifecycle of Camunda SDK JS Form.
if (product.length<1) { // If no "product" is added to the Array,
evt.submitPrevented = true; // an event handler prevents the form from being submitted by setting the property "submitPrevented" to 'true'.
}
});
</script>
So, product is the created process variable (via camForm function) and is a JSON array from the UI of the 1st user task form (Create a list of products).
So, in the 1st line of the script into the Script Task (Create a list of users), based on your last reply, I wrote this one:
var myList = ["product"]
I tried to submit again my task form with both of the 2 methods (execution.setVariable & execution.getVariable) but unfortunately without any success again
I took again the same server error message as previously here.
Thanks a lot,
Steve