CODEWITHSUNDEEP
javaspringspring-mvcfilterhandler
Catresl
Catresl

Reputation: 315

Spring MVC HandlerInterceptor : Redirect Failed

I have created a simple WebMVC application - with handler interceptor configured. The interceptors responsibility is simple - it should check if a valid session exists in the HttpRequest - and if this is true, redirect to a registration page.

The issue i encounter is that on redirect - the browser is throwing the message:

The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

The interceptors code is as follows:

public class LoginInterceptor extends HandlerInterceptorAdapter{



// to be used checking session management for user.
@Override
public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response,
                         Object handler) throws Exception {


    System.out.println(" <interceptor> - this is pre handle");

    return true;
}


@Override
public void postHandle(HttpServletRequest request,
                       HttpServletResponse response, Object handler,
                       ModelAndView modelAndView) throws Exception {

    System.out.println(" <interceptor> - this is post handle");

    HttpSession session = request.getSession();
    User user = (User) session.getAttribute("user");


    System.out.println(" <interceptor> - session id is --> " + session.getId());
    System.out.println(" <interceptor> - session create time is --> " + session.getCreationTime());
    System.out.println(" <interceptor> - session last accessed time is --> " + session.getLastAccessedTime());

    try {
        System.out.println(" <interceptor> - user info is --> " + user.toString());
    }catch(Exception e){
        e.toString();
    }

    try{
        if(session != null){
            response.sendRedirect("register");
            return;
        }
    }catch(Exception e){
        e.toString();
    }

}


public void afterCompletetion(){
    System.out.println(" <interceptor> - this is after completion");

}

}

I have attempted to append the full request context path to the redirect - as well as the root context - both of which fail. I cannot see where I am failing on this - so any help is most appreciated.

Upvotes: 0

Views: 6726

Answers (2)

Prasanna Kumar H A
Prasanna Kumar H A

Reputation: 3431

Whatever the interceptor you have written will come into picture for all requests.

So when it will redirect to /register that time also it will reach interceptor it will find that session is not null and again redirect..and same thing continues...infinite redirection to same request.

@Override
public void postHandle(HttpServletRequest request,
                       HttpServletResponse response, Object handler,
                       ModelAndView modelAndView) throws Exception { 
    HttpSession session = request.getSession(); 
    try{
        if(session != null){                            //Infinite 
            response.sendRedirect("register");
            return;
        }
    }catch(Exception e){
        e.toString();
    }

}

So Make sure that it will intercept for only one request by configuration or by code

if((request.getRequestURI().equals(contextPath+"/someURI") && session != null){
    response.sendRedirect("register");
}

Then it will check only for particular request and redirect to register.It wont fell in infinite loop.

Upvotes: 5

Srini
Srini

Reputation: 76

Check your interceptors configuration to see if its accepting only certain url pattern.

See the example below.

<!-- Configures Interceptors -->
<mvc:interceptors>
     <!-- This XML will intercept all URIs -->
     <bean class="com.howtodoinjava.interceptor.DemoInterceptor"></bean>

     <!-- This XML will apply interceptor to only certain URIs -->
     <!--
     <mvc:interceptor>
          <mvc:mapping path="/users"></mvc:mapping>
          <bean class="com.howtodoinjava.interceptor.DemoInterceptor"></bean>
     <mvc:interceptor>
      -->
</mvc:interceptors>

Upvotes: 0

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