[jbpm-users] Using Process Variables in a Rule & in a Human Task

[Ajay Phagura]

Hi Everyone,

 

I doing a PoC @ client site and trying to figure out how to use the
process variables in rule & human task. 

For the PoC I'm using the designer & jBPM console with default config (out
of the box). This is on BRMS 5.3.0 on EAP 5.1.2.

1.      The process model is pretty straight forward (see attachment):

 
User Task (client) 

Start => Script Node => Business Rule X
X => Script Node (out) => End

 
User Task (employee) 

2.      Process Variables;

String name;

String type

String flow 

3.      For using the process variables in rule task - I'm using the value
set in the process variable "flow" (in the action) to guide the transition
in the XOR:

.        I have a script node where I'm inserting the ProcessInstance

kcontext.getKnowledgeRuntime().insert(kcontext.getProcessInstance());

.        I'm setting the RuleFlow-Group as name - in the Business Rule
task

.        The rules I have are as follows

o   ruleflow-group "name"

                                             lock-on-active true

                                             when

                                                  $process :
WorkflowProcessInstance()

                                                  $type : String() from
(String)$process.getVariable("type")

                                                 eval($type == "field")

                                           then

       System.out.println("In Rule Field"); 

 
((WorkflowProcessInstance)kcontext.getKnowledgeRuntime().getProcessInstanc
e($process.getId())).setVariable("flow", "field");  

       update($process); 

 

 

o   ruleflow-group "name"

               lock-on-active true

                     when

                           $process : WorkflowProcessInstance()

                                                       $type : String()
from (String)$process.getVariable("type")

                                                       eval($type ==
"regular")

                                             then

 
System.out.println("In Rule Regular");

 
$process.setVariable("flow", "regular");

 
update($process);?

 

.        When I start the process in JBPM Console, it prints out a print
statement in the script node and creates an agenda with the right rule but
then it throws exception say cannot setVariable...

 

4.      For the using the process variables for Human Task - I remove the
Business rule node and make the process mode transition to the user tasks.

.        Here I'm using the process variable "name" to be used as the
Actor using the #{name} expression. The process creates a personal task in
the jBPM Console for that user but I'm unable to open the form. It throws
an exception saying that Expression "name" cannot be resolved in the form.
I have generated the forms before starting the process in jBPM Console.

Any help will be greatly appreciated!!

Thx!!

-Ajay

 

_______________________________________________________________________

Ajay Phagura

Red Hat Consulting

Mobile: (510) 290-4634

 <mailto:Ajay at redhat.com> Ajay at redhat.com

 <http://www.redhat.com/> www.redhat.com

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