});
ItemDefinition itemDefinition = processDefinition.getIoSpecification().getDataInputs().get(0).getDefinition();
ItemInstance itemInstance = itemDefinition.createInstance();
FieldBaseStructureInstance structureInstance = (FieldBaseStructureInstance) itemInstance.getStructureInstance();
structureInstance.setFieldValue("prefix", "The counter has the value ");
structureInstance.setFieldValue("suffix", ". Good news");
Map<String, Object> variables = new HashMap<String, Object>();
variables.put("dataInputOfProcess", itemInstance);
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceByKey("webServiceInvocationWithDataFlowUEL", variables);