Another case of magical casting:

ProcessInstance pi = ksession.startProcess("com.sample.Hello", params);

String result = (String) ((WorkflowProcessInstance)pi).getVariable("Object 1");

Please note that getVariable() returns an Object, so you will need to cast it to the real type.

ProcessInstance pi = ksession.startProcess("com.sample.Hello", params);

String result = (String) ((WorkflowProcessInstance)pi).getVariable("Object 1");

It can get the variables, when the process has no sub-process.

But i have another quertion!

if i set the variables in the parent process instance, how can i get them in the sub-process instance?

Thank you!

If you are using re-usable processes, you need to configure the input/output variable mappings between the parent process and the child process.

I have a test scenario using re-usable subprocesses. You can take a look at it if you want:

https://github.com/esteban-aliverti/JBPM-Samples/tree/master/Simple-SubProcess-Sample

The test class is ReusableSubProcessTest.java.

The processes this test uses are:

https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-SubProcess-Sample/src/test/resources/process/reusableSubProcess-Parent.bpmn

https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-SubProcess-Sample/src/test/resources/process/reusableSubProcess-Parent.bpmnand

https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-SubProcess-Sample/src/test/resources/process/reusableSubProcess-Child.bpmn

Open the bpmn files in eclipse (or in a text editor if you are tough ) and see the mapping I'm talking about.

Thank you all the same although i've learned the solution. Hhe!

Best regards!