use java8 optional

src/main/java/com/commafeed/frontend/session/SessionHelper.java

@@ -1,39 +1,40 @@
 package com.commafeed.frontend.session;
 
+import java.util.Optional;
+
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
 
 import lombok.RequiredArgsConstructor;
 
 import com.commafeed.backend.model.User;
-import com.google.common.base.Optional;
 
 @RequiredArgsConstructor()
 public class SessionHelper {
-	
+
 	private static final String SESSION_KEY_USER = "user";
-	
+
 	private final HttpServletRequest request;
-	
+
 	public Optional<User> getLoggedInUser() {
 		Optional<HttpSession> session = getSession(false);
-		
+
 		if (session.isPresent()) {
 			User user = (User) session.get().getAttribute(SESSION_KEY_USER);
-			return Optional.fromNullable(user);
+			return Optional.ofNullable(user);
 		}
-		
-		return Optional.absent();
+
+		return Optional.empty();
 	}
-	
+
 	public void setLoggedInUser(User user) {
 		Optional<HttpSession> session = getSession(true);
 		session.get().setAttribute(SESSION_KEY_USER, user);
 	}
-	
+
 	private Optional<HttpSession> getSession(boolean force) {
 		HttpSession session = request.getSession(force);
-		return Optional.fromNullable(session);
+		return Optional.ofNullable(session);
 	}
 
 }