Sample Code:
/// filter for task status
List<Status> statusList = new ArrayList<Status>();
statusList.add(Status.Created);
TaskService taskClient = new SyncTaskServiceWrapper(new AsyncMinaTaskClient());
taskClient.connect();
List<TaskSummary> taskSummaryList = taskClient.getTasksOwned(processId, statusList, "");
Also ref: https://github.com/droolsjbpm/jbpm/blob/master/jbpm-examples/src/main/java/org/jbpm/examples/humantask/HumanTaskExample.java