Question

我正在尝试使用登录servlet来验证我的角度webapp的登录信息。但是，当我发布请求时，却收到500个内部服务器错误。

这是我的loginservlet中的doPost：

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    ERS_Users user = new ObjectMapper().readValue(req.getInputStream(), ERS_Users.class);

    System.out.println(user);

    if(user == null) {

        System.out.println("inside the first if");
        resp.setStatus(400);
        resp.getWriter().write("No data submitted");
        return;
    } else {
        // authenticate user with database
        System.out.println("Inside the first else");
        user = launcher.authUser(user);

        if(user != null) {
            // everything is good send auth data
            System.out.println("inside the second if");
            resp.setStatus(200);
            resp.getWriter().write(new ObjectMapper().writeValueAsString(user));
            return;
        }
    }

    resp.setStatus(401);
    resp.getWriter().write("Email or password was incorrect");
}

我使用system.out.println来查找问题。当有角度的应用程序正在向该Servlet发送电子邮件和密码时，在到达authUser方法之前，将打印“ Inside the first else”。

这是authUser方法：

public ERS_Users authUser(ERS_Users authUser) {

    ERS_Users u = getUserbyUsername(authUser.getEmail());

    if (u!= null ) {
        if (u.getPassword().equals(authUser.getPassword())) {
            u.setPassword("");
        }else {
            u = null;
        }
    }

    return u;
}

public ERS_Users getUserbyUsername(String authUser) {
    System.out.println("inside getuserbyusername");
    Session session = sessionFactory.openSession();
    System.out.println("inside getuserbyusername2");


    Transaction tx = session.beginTransaction();

    List<ERS_Users> u = null;
    String hql = "From Users where ERS_EMAIL =: username";
    NativeQuery q = session.createNativeQuery(hql);
    q.setParameter("username", authUser);
    u=q.getResultList();
    ERS_Users users= null;
    if(!u.isEmpty()){
        // ignores multiple results
        users= u.get(0);
    }
    session.close();
    return users;
}

“ inside getuserbyusername”是打开会话时发生错误之前最后打印的内容：

Session session = sessionFactory.openSession();

我所看到的最接近的答案是Error 500 due to session

但是我清楚地创建了会话。

打开会话会导致500内部服务器错误

0 个答案: