HTTP Status 500 - Unable to instantiate Action, departmentAction, defined for 'department_getAllDepartment' in namespace '/'Error creating bean with name 'departmentAction' defined in file [C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\OA_7\WEB-INF\classes\applicationContext-actions.xml]: Initialization of bean failed; nested exception is org.springframework.beans.InvalidPropertyException: Invalid property 'departmentManager' of bean class [com.meng.oa.struts2.action.DepartmentAction]: No property 'departmentManager' found