servlet被调用两次!

抱歉,我没有实际的代码,但我会尽力解释:

我有一个servlet映射到以下内容:

/admin/* 

所以,这是一个servlet:

public class AdminController extends MainController {
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        // Do stuf here
    }
}

这里是主控制器:

public class MainController extends HttpServlet {
@Override
public void service(ServletRequest request, ServletResponse response) {
    String requesturi = ((HttpServletRequest)request).getRequestURI();
    reqlist = Arrays.asList(requesturi.substring(requesturi.indexOf(Util.rootPath) + Util.rootPath.length()).split("/"));
    reqlist = reqlist.subList(1, reqlist.size());

    doPost((HttpServletRequest)request, (HttpServletResponse)response);
}

所以,请求被传递给了admincontroller,没问题,但是我重新分配了一些东西:

servlet被调用了两次! . 这给我带来了很多错误。

有人知道这方面的线索吗?是因为我使用了某种遗传? 谢谢大家!