Java Web-如何使会话不停止？

我的问题是，我登录到运行正常的Java Web应用程序，在登录到另一个网站后，“jsessionid”消失，我必须再次登录。如何保持登录状态

@ManagedBean
public class SecurityBean {
    private boolean loggedIn = false;
    private String username;
    private String password;
    private String template;

    public String getUsername(){
        return username;
    }

    public void setUsername(String username){
        this.username = username;
    }

    public String getPassword(){
        return password;
    }

    public void setPassword(String password){
        this.password = password;
    }
    public boolean isLoggedIn(){
        return loggedIn;
    }
    public void setLoggedIn(boolean loggedIn){
        this.loggedIn = loggedIn;
    }
    public String getTemplate(){
        if(loggedIn){
            return "/WEB-INF/templates/user.xhtml";
        }else{
            return "/WEB-INF/templates/main.xhtml";
        }
    }
    public void setTemplate(String template){
        this.template = template;
    }

    public String login(){
        FacesContext context = FacesContext.getCurrentInstance();
        HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest();
        try{
            request.login(username, password);
        }catch(ServletException e){
            context.addMessage(null, new FacesMessage("Login failed"));
            return "error";
        }
        loggedIn = true;
        return "user/home"
    }

    public void logout(){
        FacesContext context = FacesContext.getCurrentInstance();
        HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest();
        try{
            request.logout();
            loggedIn = false;
        }catch(ServletException e){
            context.addMessage(null, new FacesMessage("Logout failed"));
        }
    }

}

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将您需要的任何信息保存在cookie中。它已经是：（您使用的是什么应用程序服务器？您使用什么登录到应用程序？