topic Re: Exception starting process instance in Alfresco Archive

Exception starting process instance

gant — Fri, 22 Jul 2011 05:28:01 GMT

Hi,I try to start a process instance:HashMap<String,Object> variables = new HashMap<String,Object>(); variables.put("payload", req); runtimeService.startProcessInstanceByKey("requestProcess", variables);‍‍‍‍and get the following exception:Caused by: java.lang.IllegalArgu

Re: Exception starting process instance

trademak — Fri, 22 Jul 2011 07:08:36 GMT

Hi,

I looked at the stacktrace and before it goes to the toIndex method a check is performed to see if the object is an instance of a List.
Can you post the full process (BPMN 2.0 XML and Java code), so I can run it myself?

Best regards,

Re: Exception starting process instance

gant — Fri, 22 Jul 2011 08:22:49 GMT

Hi,

Attached you can find the maven project. No forms are present, because we use external form rendering.

Regards
michael

Re: Exception starting process instance

trademak — Fri, 22 Jul 2011 20:22:25 GMT

Hi,

There were a couple of errors in your project before I received the same error message.
The problem cause is the business rule task. You set the payload variable as the resultVariableName of the business rule task.
The result variable of a business rule task is a collection of objects, in this case a collection of 1 object –> Request object.
Therefore you got the exception related to a collection.
I changed the project with an additional service task and now it works.
I encountered a bug in the business rule task behavior that I fixed in the 5.7-SNAPSHOT trunk.
The exclude boolean of the business rule task in 5.6 works just the opposite of what you would think. So when you set exclude to false, it's excluded. I fixed this so in the 5.7 release this will work as expected.

Best regards,

Re: Exception starting process instance

gant — Mon, 25 Jul 2011 09:23:42 GMT

Hi Tijs,

Thank you for your fast an detailed answer.

I did not find any hints on the behaviour of the result-variable-mechanismus of BR-tasks in the docs.

I'd like to avoid the service task you use to copy the variables. Could I use a Listener thatfore? The process model would then not be polluted by the service task. But I think, this would only work, if the task has completely finished before the listener is executed. Is this the case?

Best regards.