private Integer attendRecordId;
    private Integer applicationId;
    private Integer attendPercentage;
    private Integer cpdId;
    private Integer mpfCpdCore;
    private Integer mpfCpdNonCore;
    private Integer cpt;
    private String createdBy;
    private Timestamp createDate;
    private Set<TrainingCourseClassAttendPeriod> trainingCourseClassAttendPeriod = null;
set/get省略

    private Integer id;
    private Integer attendRecordId;
    private Timestamp attendDate;
    private Boolean attendAmSession;
    private Boolean attendPmSession;

    public List<Role> selRole(int currentPage) {
        session = sf.getCurrentSession();
        Query query = session.createQuery("from Role");
        query.setFirstResult((currentPage - 1) * RPAGESIZE);
        query.setMaxResults(RPAGESIZE);
        List<Role> list = query.list();
        for (int i = 0; i < list.size(); i++) {
            Iterator it = list.get(i).getStates().iterator();
            while (it.hasNext()) {
                State s = (State) it.next();
            }
        }
        return query.list();
    }

------解决方案--------------------

意思是提交保存？不是name与之相对应不就好了

<s:iterator value="firstList" status="stu" var="xxx">
    <input name="firstList[${stu.index}].xxx1"/>
    <s:iterator value="xxx.secondList" status="stud" var="xxxx">
        <input name="firstList[${stu.index}].secondList[${stud.index}].xxxx1" />
    </s:iterator>
</s:iterator>