问从java.lang.StackOverflowError动作标记调用动作时的Struts2

EN

<s:action name="query-privilege" executeResult="false" var="privilege">
            <s:param name="moduleid">9</s:param>
            <s:param name="privilege">v</s:param>
            <s:param name="pagename">dccr</s:param>
</s:action>

<s:if test="%{#privilege.allowable == false}">
       //do something
</s:if>

    private String pagename;
    private String moduleid;
    private boolean allowable;
    private String privilege;
    private final UsertypeModuleDAO umodDao = (UsertypeModuleDAO) ServletActionContext.getServletContext().getAttribute("usermoduleDAO");

    //loggers, session properties etc.

@Action(value = "/query-privilege", results = {
        @Result(name = "SUCCESSdccr", location = "/dccr.jsp"),
        @Result(name = "ERROR", location = "../error/messages.jsp")
    })
    @Override
    public String execute() {
        try {
            char p = privilege.charAt(0);
            int i = Integer.parseInt(moduleid);
            allowable = queryPrivilege(i, p);
            logger.info(privilege+", "+moduleid+", "+ut.getUsertypeid()+", "+allowable);
            return SUCCESS + pagename;
        } catch (Exception e) {
            if (emps != null) {
                logger.fatal("(" + emps.getIdnumber() + "):" + e.getLocalizedMessage(), e);
            } else {
                logger.fatal(e.getLocalizedMessage(), e);

            }
            e.printStackTrace();
            addActionError(e.getLocalizedMessage());
            return ERROR;
        }
    }

    private boolean queryPrivilege(int moduleid, char privilege) {
        DetachedCriteria criteria = DetachedCriteria.forClass(UsertypeModule.class);
        criteria.createCriteria("usertypes", "ut").setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
        criteria.createCriteria("modules", "m").setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
        criteria.add(Restrictions.eq("m.moduleid", moduleid));
        criteria.add(Restrictions.eq("ut.usertypeid", ut.getUsertypeid()));
        UsertypeModule um = umodDao.getPrivilege(criteria);
        logger.info(um.getModulename());
        boolean p = false;
        switch (privilege) {
            case 'v': p = um.isViewable();
                break;
            case 'e': p = um.isEditable();
                break;
            case 'c': p = um.isCreateable();
                break;
            case 'd': p = um.isDeleteable();
                break;
        }
        return p;
    }

//getters and setters

@SuppressWarnings("unchecked")
    public UsertypeModule getPrivilege(DetachedCriteria dc){
        Criteria criteria = dc.getExecutableCriteria(session);
        criteria.setMaxResults(1);
        return (UsertypeModule) criteria.uniqueResult();
    }

May 31, 2011 8:34:52 AM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.StackOverflowError
    at java.util.HashMap.get(HashMap.java:300)
    at java.lang.Package.getSystemPackage(Package.java:491)
    at java.lang.Package.getPackage(Package.java:313)
    at java.lang.Class.getPackage(Class.java:698)
    at com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.isCandidadeClass(SessionTransactionInjectorInterceptor.java:313)
    at com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.injectHibernateCoreSession(SessionTransactionInjectorInterceptor.java:340)
    at com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.injectHibernateCoreSession(SessionTransactionInjectorInterceptor.java:361)