I hava acheive this function :
public ModelAndView historyTasks(HttpServletRequest request,Task task){
ModelAndView mv = new ModelAndView();
ModelMap mp = new ModelMap("historyTasks");
StatefulKnowledgeSession ksession = jbpmSupport.getKsession();
TaskService taskService = jbpmSupport.getTaskService();
String username = (String) request.getSession().getAttribute("uname");
String sqlquery = "from Task where status='Completed'and createdBy_id='"+username+"'";
List<Task> tasks = (List<Task>) taskService.query(sqlquery, sqlquery.length(), 0);
mp.put("tasks", tasks);
mp.put("task", task);