Redirect after login

Filter redirecting.java

String requestURI  = request.getRequestURI();
String queryString = request.getQueryString();
String encodedURL  = URLEncoder.encode(requestURI + "?" + queryString, "UTF-8");
response.sendRedirect(request.getContextPath() + "/login.xhtml?originalURL=" + encodedURL);

Login bean.java

@Named(value = "loginBean")
@ViewScoped
public class LoginBean implements Serializable {
    @ManagedProperty(value = "#{userSession}")
    private UserSessionBean userSession;
    private String          originalURL;    

    @PostConstruct
    public void init() {
        this.originalURL = userSession.getOriginalURL();
    }

    public void login() {
        try { 
            // Perform login logic
            ...
            // Redirect the user back to where they have been after successful login
            FacesContext.getCurrentInstance().getExternalContext().redirect(originalURL);
        } catch (IOException ex) {
            System.out.println("UserSessionBean - Exception: " + ex.toString());
        }
    }
}

orignalURL is null.java

@PostConstruct
public void init() {
    ExternalContext    externalContext = FacesContext.getCurrentInstance().getExternalContext();
    HttpServletRequest request         = (HttpServletRequest) externalContext.getRequest();
    
    this.originalURL = userSession.getOriginalURL();
    if (originalURL == null) {
      // Redirect to home page in case the user didn't surf any pages before logging in
      this.originalURL = request.getContextPath() + "home.xhtml";
    }
}

Record request URL.xhtml

<f:view>
    <ui:param name="originalURL" value="#{request.requestURI}?#{request.queryString}" />
        
    <f:metadata>
        <f:event rendered="#{not userSession.loggedIn}" type="preRenderView" listener="#{userSession.recordOriginalURL(originalURL)}" />
    </f:metadata>
</f:view>

Retrieve original URL.java

@PostConstruct
public void init() {
    ExternalContext    externalContext     = FacesContext.getCurrentInstance().getExternalContext();
    HttpServletRequest request             = (HttpServletRequest) externalContext.getRequest();
    String             forwardedRequestURI = (String) externalContext.getRequestMap().get(RequestDispatcher.FORWARD_REQUEST_URI);
    
    if ((this.originalURL = request.getParameter("originalURL")) != null) {
        // If the user was redirected, retrieve the originalURL from the request's "originalURL" parameter
        return;
    
    } else if (forwardedRequestURI == null) { 
        // If the user logged in directly from the top bar, simply redirect to the originalURL recorded by UserSessionBean
        this.originalURL = userSession.getOriginalURL();
        if (originalURL == null) {
            // Redirect to home page in case the user didn't surf any pages before logging in
            this.originalURL = request.getContextPath() + "home.xhtml";
        }
        
    } else {
        // If the user was forwarded to the login page, re-build the orignal requestURL
        this.originalURL     = forwardedRequestURI;
        String originalQuery = (String) externalContext.getRequestMap().get(RequestDispatcher.FORWARD_QUERY_STRING);

        if (originalQuery != null) {
            this.originalURL += "?" + originalQuery;
        }
    }
}

Session-scoped managed bean.java

@ManagedBean(value = "userSession")
@SessionScoped
public class UserSessionBean implements Serializable {
    private boolean loggedIn;
    private String  originalURL;
    
    public void recordOriginalURL(String originalURL) {
        this.originalURL = originalURL;
    }
    
    // Getters and Setters
}