CODEWITHSUNDEEP
jersey
Pawan
Pawan

Reputation: 32331

Why the session attribute is coming as null

A HTML5 UI is connected to the backend (REST Jersey to business logic to Hibernate and DB). I need to create and maintain a session for each user login until the user logs out.

I am clueless on how to approach this problem.

I followed this approach

Initially when the User is successfully logs in , i am setting attribute under session as shown below 

HttpSession session = request.getSession(true);
session.setAttribute("islogged", "islogged");
String value = (String)session.getAttribute("islogged");
System.out.println("****************** The User Logge in Value"+value);

Later in a different page i am checking if the user is logged in or not this way 

public String checkIfUserLoggedIn() throws JSONException,ClassNotFoundException, SQLException
    {
        HttpSession session = request.getSession();
         String value = (String)session.getAttribute("islogged");

        if(value==null)
        {
            // always its coming here only

        }

    }

Upvotes: 1

Views: 1332

Answers (2)

jeorfevre
jeorfevre

Reputation: 2316

I agree with francesco foresti, please do not rely on HTTP session without Auth. this is unsafe, and quite dangerous for your app.

Have you been implementing a specific session mecanism ? If not, jersey as it is will not store session data as it. Every call that you will make will give you a session id that is different from yours. You have to make authentication & use the auth token in order to identify you session.

  1. use JAX-RS Please do use an auth mecanism as defined : https://jersey.java.net/documentation/latest/security.html

    @Path("authentication")
@Singleton
public static class MyResource {
    // Jersey will inject proxy of Security Context
    @Context
    SecurityContext securityContext;

    @GET
    public String getUserPrincipal() {
        return securityContext.getUserPrincipal().getName();
    }
}

  2. or use another framework : Spring, Shiro.... etc. I really prefer that solution, since another framework will implement a lot of stuff for you. You gain a lot of time doing so.

Please take a look to official jersey doc: https://jersey.java.net/documentation/latest/index.html

Upvotes: 2

francesco foresti
francesco foresti

Reputation: 2043

I wouldn't rely on the http session. My approach would be to put an "Authorization" field in the header of the response that the server returns when the user logs in, and ask the user to put the very same header in each suqsequent call. In this header you put the informations that help the server find the identity of the user (take a look at what twitter does as an example : https://dev.twitter.com/oauth/overview/authorizing-requests). The server could save the informations about the logged in user in the database, or You could create a Map in a Singleton that would serve as the "authorization gatekeeper" for your services.

Upvotes: 0

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