JBPM 7.7 Start process instance by message

[Timur Sazon]

I want to start my process instance by message event in JBPM Workbench/Kie-Server (7.7.0) but I can't find the request for it.

I found a way to achieve this by the POST request with empty body:

/server/containers/{id}/processes/instances/signal/{sName}

Instead of signal name I have to send message event id. But there is a problem with it - id is changed by JBPM Web Designer at any time when I edit the event.

Is it possible to start process instance by message? I didn't find this in the DOCS.

My process (Evaluation sample with added start message event)

[Timur Sazon]

Edit:

Instead of sName I have to put: Message-{bpmn2:message id}. But there is a problem with it - id is changed by JBPM Web Designer at any time when I edit the event's messageRef. It seems should work with API (Example) but doesn't work with REST API.

[jagan reddy]

HI
http://localhost:8080/kie-server/docs/

[Maciej Swiderski]

To start process by message you need to use signal endpoint where your signal is composed of:

Message-{messageRef}

MessageRef comes from the message start event that you created your process definition with 

Maciej

Wiadomość napisana przez Timur Sazon <timv...@gmail.com> w dniu 01.06.2018, o godz. 12:02:

Edit:

Instead of sName I have to put: Message-{bpmn2:message id}. But there is a problem with it - id is changed by JBPM Web Designer at any time when I edit the event's messageRef. It seems should work with API (Example) but doesn't work with REST API.

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[Timur Sazon]

It doesn't work.

Example:

If I use this request - nothing happens: http://172.17.0.3:8080/kie-server/services/rest/server/containers/StartMessage_1.0.0/processes/instances/signal/Message-HelloMessage (in the start event messageRef=HelloMessage).

But it works with this: http://172.17.0.3:8080/kie-server/services/rest/server/containers/StartMessage_1.0.0/processes/instances/signal/Message-_45d993e1-cd41-3454-a7c2-d2cd902f3bd3 (message id).

Probably bug in the REST API.

[Bibhutibhusan Sahoo]

Hi

How to pass the message from REST service to invoke the process via message start activity. 

[Maciej Swiderski]

Look for this endpoint in the swagger docs

/server/containers/{id}/processes/instances/signal/{sName}

Your signal name (sName) should be ‘Message-XXX’ where XXX is what is defined in the process definition

Maciej

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[Bibhutibhusan Sahoo]

Hi Maciej,

Thanks for your response however the below REST URL works for input message is string. Wanted to trigger the process with input message based on complex data type. 

While doing so I am getting class cast exception as at run time the engine trying to convert the message string to complex data object/process variable. How to send the parameter in message argument?

[Maciej Swiderski]

You do this via payload, example if your complex type is com.company.Person

You could send following payload

{

“Person” : {

“name” : “test"

}

}

So Kie Server can properly unmarshall it to an object

Maciej

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[Bibhutibhusan Sahoo]

Thanks for your reply however the below payload is not working for the message start activity It throws a class cast exception. 

Message: messageArg 

Data Output Assignment: Name: messageArg, DataType: Person, Target: person

I tried mapping with String datatype and it works for it but if the datatype is complex, it throws class cast exception

Am I doing something wrong?