int类型是不可序列化的，参数传递时，如果传过去后的参数是Serializable,则必须把int型转换为Integer类型如：

public void deleteStation(Integer[] ids) {
   try {
    stationParDAO.delete(stuIfno.class, ids);
   } catch (DAOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }

}

被调用的方法： delete(Class<T> refClass, Serializable[] key)
如果上例中主调方法改为：
public void deleteStation(int[] ids) {
   try {
    stationParDAO.delete(stuIfno.class, ids);
   } catch (DAOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
}

异常如下：
javax.servlet.ServletException: org.springframework.orm.hibernate3.HibernateSystemException: Provided id of the wrong type. Expected: class java.lang.Integer, got class [I; nested exception is org.hibernate.TypeMismatchException: Provided id of the wrong type. Expected: class java.lang.Integer, got class [I
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:515)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419)
org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)

root cause