public String getWorkItemByProcessInstance(String containerId, Number processInstanceId, String marshallingType) { containerId = context.getContainerId(containerId, new ByProcessInstanceIdContainerLocator(processInstanceId.longValue())); List<WorkItem> workItems = processService.getWorkItemByProcessInstance(containerId, processInstanceId.longValue()); WorkItemInstance[] instances = new WorkItemInstance[workItems.size()]; int counter = 0; for (WorkItem workItem : workItems) { WorkItemInstance workItemInstance = WorkItemInstance.builder() .id(workItem.getId()) .nodeInstanceId(((org.drools.core.process.instance.WorkItem) workItem).getNodeInstanceId()) .processInstanceId(workItem.getProcessInstanceId()) .containerId(((org.drools.core.process.instance.WorkItem) workItem).getDeploymentId()) .name(workItem.getName()) .nodeId(((org.drools.core.process.instance.WorkItem) workItem).getNodeId()) .parameters(workItem.getParameters()) .state(workItem.getState()) .build(); instances[counter] = workItemInstance; counter++; } WorkItemInstanceList result = new WorkItemInstanceList(instances); logger.debug("About to marshal work items {}", result); String response = marshallerHelper.marshal(containerId, marshallingType, result); return response; }