JSON mapping problems in process (renamed)

Camunda 7 Topics Discussion & Questions
1

Hello everyone.

I wondered if it is mandatory when working with Camunda REST API to pass the arrays as Jackson (JSON) objects ?
Do I have to add to my .war a Java class foreach array that I use in my process ?

I just got an error like
{“type”:“ProcessEngineException”,“message”:“Cannot deserialize object in variable ‘subscriptions’: SPIN/JACKSON-JSON-01007 Cannot construct java type from string ‘array.Subscriptions’”}

Thanks a lot :smiley:

edit : additionally, I don’t know if the string from which process engine tries to get a Java type must be package.name.ClassName

2

No, you don’t need a Java class to back your JSON variable. In your REST request, you can set the variable type to json instead of object. Then you won’t have to supply any valueInfo data and you will get what is called a native JSON value as documented here and here.

Edit regarding your edit :slight_smile: : For variables of type object, the type name must be the full qualified class name, i.e. including package names.

3

Thanks for your answer. Do the JSON variable appear as JSON in cockpit ? I only see String process variables.

Maybe I’m missing some dependencies, even if I use pre-built Camunda docker image

4

A variable that can be successfully set should also be visible in Cockpit. Not sure if you can inspect the variable’s value, though.

5

I confirm I can’t inspect value for “Json” type.

I have a problem now : I can’t complete the “See business rules result” task in the BPMN here launchCancel.bpmn (34.8 KB)

The answer to my REST “complete task” call towards Camunda API is :
{“type”:“ScriptEvaluationException”,“message”:“Unable to evaluate script: SyntaxError: Invalid JSON: :1:0 Expected json literal but found <\n
\n^ in at line number 2”}’

I’ve put all my scripts inline to make the overview easier. I don’t know which script the problem is from, and why I have a
markup whereas I use only freemarker for payload and JS for answer mapping.

For instance, the “creditPayload” payload var for “create credit note” task is escaped JSON, with “” before the “:”.

Any idea ? Good afternoon :slight_smile:

Edit : when searching my process instance’s variables, I have the following value for the JSON I want to map as payload for my Credit note REST task :

Capture du 2017-06-07 16-13-54.png1920×1080 315 KB

The Json variable type now appears in Cockpit, it has been interpreted as Object as seen above. But I don’t know how to map it.
For now my freemarker is just “${creditPayload}” as you see in BPMN. But it does’t seem the correct syntax. What is the correct way to map the screenshot’s value in a JSON of same structure ?

Here is my POM if ever this is a dependency issue, but I’ve got the feeling it is a syntax issue. Thanks for reading :slight_smile: pom.xml (1.9 KB)