How to read return-variable from bpmn files to java file?

[mutou]

Hello!

I hava some problems here.

     StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

              Map<String,Object>paras=new HashMap<String,Object>();

             paras.put("i", new Integer("1"));

             paras.put("ret", new Integer("10"));

                         // start a new process instance

                              ProcessInstance instance=(ProcessInstance) ksession.startProcess("org.jbpm.sample.hello",paras);

           System.out.println(paras.get("ret"));

I hava two parameters here, "i' and "ret", "i" is the input and i want "ret" to be the output. Furthmore, the script in the bpmn file

will process the sentence:

        ret = 2 * i;

so  "ret" will be 2. However, in my java file after "System.out.println(paras.get("ret"));" was processed, it output 10.

I am confused that how to read the return value "ret" from the bpmn file and in my work, how to print the correct Integer 2 rather than 10???

should I utilize kcontext ? But kcontext is predefined in script, not in java file. How to define kcontext and utilize it to get varible???

Thanks !!!

[milhaim]

Hi,

you can get the new value by : ret = instance.getVariable(variableName);

you just need to be sure that your java code is executed after your ret variable was updated (after the exeution of your script).

HTH.

[mutou]

I am sorry that it can't work.

the varible instance of Class ProcessInstance hava no such functions as getVarible(). So this is not a good approach.

I am sure that ret was updated after the execution of my script. I print out the result in my script and it is 2.

Thank you anyway.

[milhaim]

you have to cast the processInstance to WorkflowProcessInstanceImpl:

use :

WorkflowProcessInstanceImpl processInstance = (WorkflowProcessInstanceImpl) ksession.getProcessInstance(processInstanceId)

or

WorkflowProcessInstanceImpl instance=(WorkflowProcessInstanceImpl) ksession.startProcess("org.jbpm.sample.hello",paras);

and  processInstance.getVariable("ret");

this is working from me

HTH

[mutou]

That's a good idea!

It's right!

Thank you very much!!

[milhaim]

you're welcome.

miloud