将会话值从操作传递到seam框架中的servlet

Question

I am setting the session object in TestAction class and when i am trying to get the session object in TestServlet it returns null. Any one please tell me how to pass session from action class to servlet in Seam framework.

@Scope(ScopeType.EVENT)
@Name("testAction  ")
public class TestAction  {

    public void setSessionObj(){

        FacesContext facesContext = FacesContext.getCurrentInstance();
        HttpSession session = (HttpSession) facesContext.getExternalContext().getSession(false);
        session.setAttribute("temp", "124563");
    }
}

//Servlet starts here

 public class TestServlet extends HttpServlet {

        public void init(ServletConfig servletConfig) throws ServletException {
            super.init(servletConfig);
            servletContext = servletConfig.getServletContext();

        }

        protected String doExecute(HttpServletRequest request,
                HttpServletResponse response) throws Exception {

                 Session session =    request.getSession(false);
            String user1 = (String) session .getAttribute("temp");
        }
    }

Below is the observation on debugging the session instances

I checked session object instance in case of what i am getting in action and servlet, they both are different instances of Session. For eg instance in action is StandardSession[41CBDED6EBBBECEBA001A70555F51CA5] and what im getting in servlet is StandardSession[EACBDED6E34BECEB3401A70555F51CA5], Any reason why i am getting different session instances

Answer 1

There shouldn't be any need to access the session attributes via the FacesContext in your servlet. Just use request.getSession() to get the session. As long as your requests are actually from the same session, the session attributes should be available in the servlet.

Answer 2

I would use a proxy-object that gets injected via CDI / Spring into both the JSF Managed Bean and the servlet.

This example creates an CDI Bean with is kept alive during the whole time and just stores a String. Trough dependecy injection both components can access it.

Create an empty bean.xml file under META-INF resource folder

@Named
@ApplicationScoped
public class Container{
 private String temp;

 public Container(){

 }
 public void setTemp(String temp) {
  this.temp = temp;
 }

 public String getTemp() {
  return temp;
 }
}

@Scope(ScopeType.EVENT)
@Name("testAction  ")
public class TestAction  {

 @Inject 
 Container container;

public void setSessionObj(){
 container.setTemp("123456");

}
}

//Servlet starts here

public class TestServlet extends HttpServlet {

@Inject
Container container; 
    public void init(ServletConfig servletConfig) throws ServletException {
        super.init(servletConfig);
        servletContext = servletConfig.getServletContext();

    }

    protected String doExecute(HttpServletRequest request,
            HttpServletResponse response) throws Exception {

             Session session =    request.getSession(false);
        String user1 = container.getTemp();
    }
}