diff --git a/src/main/java/de/thm/arsnova/aop/UserSessionAspect.java b/src/main/java/de/thm/arsnova/aop/UserSessionAspect.java
index bfe0dad441bf1bc57c68f54585aafba56e701feb..690fdd241bf238dfcb89f3009e9af7d4976f1c11 100644
--- a/src/main/java/de/thm/arsnova/aop/UserSessionAspect.java
+++ b/src/main/java/de/thm/arsnova/aop/UserSessionAspect.java
@@ -14,35 +14,17 @@ public class UserSessionAspect {
 	@Autowired
 	private UserSessionService userSessionService;
 
-	/** Sets current user and ARSnova session in session scoped UserSessionService 
-	 * 
+	/** Sets current user and ARSnova session in session scoped UserSessionService
+	 *
 	 * @param jp
 	 * @param keyword
 	 * @param session
 	 */
 	@AfterReturning(
-		pointcut="execution(public * de.thm.arsnova.services.SessionService.joinSession(..)) && args(keyword)",
-		returning="session"
-	)
+			pointcut="execution(public * de.thm.arsnova.services.SessionService.joinSession(..)) && args(keyword)",
+			returning="session"
+			)
 	public final void joinSessionAdvice(final JoinPoint jp, final String keyword, final Session session) {
 		userSessionService.setSession(session);
 	}
-
-	/** Sets current user, ARSnova session and websocket session ID in session scoped UserSessionService 
-	 * 
-	 * @param jp
-	 * @param keyword
-	 * @param socketId
-	 * @param session
-	 */
-	/* FIXME This is not working because of scoping problems
-	@AfterReturning(
-		pointcut="execution(public * de.thm.arsnova.services.SessionService.joinSession(..)) && args(keyword, socketId)",
-		returning="session"
-	)
-	public final void joinSessionAdviceWithWebsocket(final JoinPoint jp, final String keyword, final UUID socketId, final Session session) {
-		userSessionService.setSession(session);
-		userSessionService.setSocketId(socketId);
-	}
-	*/
 }
diff --git a/src/main/java/de/thm/arsnova/controller/LoginController.java b/src/main/java/de/thm/arsnova/controller/LoginController.java
index 37a47167a39b5877aa33d110afc69f13c65a7b19..a1fee3a1fda43f452836a96f9e3bffc093c3cfda 100644
--- a/src/main/java/de/thm/arsnova/controller/LoginController.java
+++ b/src/main/java/de/thm/arsnova/controller/LoginController.java
@@ -93,9 +93,9 @@ public class LoginController extends AbstractController {
 			@RequestParam(value = "role", required = false) UserSessionService.Role role,
 			final HttpServletRequest request,
 			final HttpServletResponse response
-	) throws IOException, ServletException {
+			) throws IOException, ServletException {
 		userSessionService.setRole(role);
-		
+
 		String referer = request.getHeader("referer");
 		if (null != forcedReferer && null != referer && !UrlUtils.isAbsoluteUrl(referer)) {
 			/* Use a url from a request parameter as referer as long as the url is not absolute (to prevent
@@ -107,14 +107,14 @@ public class LoginController extends AbstractController {
 		}
 
 		request.getSession().setAttribute("ars-login-success-url",
-			null == successUrl ? referer + "#auth/checkLogin" : successUrl
-		);
+				null == successUrl ? referer + "#auth/checkLogin" : successUrl
+				);
 		request.getSession().setAttribute("ars-login-failure-url",
-			null == failureUrl ? referer : failureUrl
-		);
+				null == failureUrl ? referer : failureUrl
+				);
 
 		View result = null;
-		
+
 		if ("cas".equals(type)) {
 			casEntryPoint.commence(request, response, null);
 		} else if ("twitter".equals(type)) {
@@ -133,12 +133,14 @@ public class LoginController extends AbstractController {
 			if (guestName != null && guestName.startsWith("Guest") && guestName.length() == MAX_USERNAME_LENGTH) {
 				username = guestName;
 			} else {
-				username = "Guest" + Sha512DigestUtils.shaHex(request.getSession().getId()).substring(0, MAX_GUESTHASH_LENGTH);
+				username = "Guest" + Sha512DigestUtils.shaHex(
+						request.getSession().getId()
+						).substring(0, MAX_GUESTHASH_LENGTH);
 			}
 			org.springframework.security.core.userdetails.User user =
 					new org.springframework.security.core.userdetails.User(
 							username, "", true, true, true, true, authorities
-					);
+							);
 			Authentication token = new UsernamePasswordAuthenticationToken(user, null, authorities);
 
 			SecurityContextHolder.getContext().setAuthentication(token);
@@ -146,14 +148,14 @@ public class LoginController extends AbstractController {
 					SecurityContextHolder.getContext());
 			result = new RedirectView(null == successUrl ? referer + "#auth/checkLogin" : successUrl);
 		}
-				
+
 		return result;
 	}
 
 	@RequestMapping(value = { "/auth/", "/whoami" }, method = RequestMethod.GET)
 	@ResponseBody
 	public final User whoami() {
-		userSessionService.setUser(userService.getCurrentUser());		
+		userSessionService.setUser(userService.getCurrentUser());
 		return userService.getCurrentUser();
 	}
 
diff --git a/src/main/java/de/thm/arsnova/controller/SessionController.java b/src/main/java/de/thm/arsnova/controller/SessionController.java
index b8443784bf35398a46b3845e246b7f97b5ae019e..27e5c8e1f38dabdbb88147978284ad532e10451b 100644
--- a/src/main/java/de/thm/arsnova/controller/SessionController.java
+++ b/src/main/java/de/thm/arsnova/controller/SessionController.java
@@ -61,8 +61,7 @@ public class SessionController extends AbstractController {
 	@RequestMapping(value = "/{sessionkey}", method = RequestMethod.GET)
 	@ResponseBody
 	public final Session joinSession(@PathVariable final String sessionkey) {
-		Session session = sessionService.joinSession(sessionkey);
-		return session;
+		return sessionService.joinSession(sessionkey);
 	}
 
 	@RequestMapping(value = "/{sessionkey}", method = RequestMethod.DELETE)
@@ -78,7 +77,7 @@ public class SessionController extends AbstractController {
 	public final LoggedIn registerAsOnlineUser(
 			@PathVariable final String sessionkey,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Deprecated-API", "1");
 
 		User user = userService.getCurrentUser();
@@ -95,7 +94,7 @@ public class SessionController extends AbstractController {
 	public final int countActiveUsers(
 			@PathVariable final String sessionkey,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Deprecated-API", "1");
 
 		return userService.getUsersInSessionCount(sessionkey);
@@ -132,7 +131,7 @@ public class SessionController extends AbstractController {
 	public final Session updateSession(
 			@PathVariable final String sessionkey,
 			@RequestBody final Session session
-	) {
+			) {
 		return sessionService.updateSession(sessionkey, session);
 	}
 
@@ -143,7 +142,7 @@ public class SessionController extends AbstractController {
 			@RequestParam(value = "visitedonly", defaultValue = "false") final boolean visitedOnly,
 			@RequestParam(value = "sortby", defaultValue = "name") final String sortby,
 			final HttpServletResponse response
-	) {
+			) {
 		User user = userService.getCurrentUser();
 		List<Session> sessions = null;
 
@@ -183,7 +182,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String sessionkey,
 			@RequestParam(required = false) final Boolean lock,
 			final HttpServletResponse response
-	) {
+			) {
 		if (lock != null) {
 			return this.sessionService.setActive(sessionkey, lock);
 		}
@@ -196,7 +195,7 @@ public class SessionController extends AbstractController {
 	public final int learningProgress(
 			@PathVariable final String sessionkey,
 			final HttpServletResponse response
-	) {
+			) {
 		return sessionService.getLearningProgress(sessionkey);
 	}
 
@@ -205,7 +204,7 @@ public class SessionController extends AbstractController {
 	public final int myLearningProgress(
 			@PathVariable final String sessionkey,
 			final HttpServletResponse response
-	) {
+			) {
 		return sessionService.getMyLearningProgress(sessionkey);
 	}
 
@@ -215,7 +214,7 @@ public class SessionController extends AbstractController {
 	public final String redirectLecturerQuestion(
 			@PathVariable final String sessionKey,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/lecturerquestion/?sessionkey=%s", sessionKey);
@@ -226,7 +225,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String sessionKey,
 			@PathVariable final String arg1,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/lecturerquestion/%s/?sessionkey=%s", arg1, sessionKey);
@@ -238,7 +237,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String arg1,
 			@PathVariable final String arg2,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/lecturerquestion/%s/%s/?sessionkey=%s", arg1, arg2, sessionKey);
@@ -251,7 +250,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String arg2,
 			@PathVariable final String arg3,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/lecturerquestion/%s/%s/%s/?sessionkey=%s", arg1, arg2, arg3, sessionKey);
@@ -261,7 +260,7 @@ public class SessionController extends AbstractController {
 	public final String redirectAudienceQuestion(
 			@PathVariable final String sessionKey,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/audiencequestion/?sessionkey=%s", sessionKey);
@@ -272,7 +271,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String sessionKey,
 			@PathVariable final String arg1,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/audiencequestion/%s/?sessionkey=%s", arg1, sessionKey);
@@ -284,7 +283,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String arg1,
 			@PathVariable final String arg2,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/audiencequestion/%s/%s/?sessionkey=%s", arg1, arg2, sessionKey);
@@ -297,7 +296,7 @@ public class SessionController extends AbstractController {
 			@PathVariable final String arg2,
 			@PathVariable final String arg3,
 			final HttpServletResponse response
-	) {
+			) {
 		response.addHeader("X-Forwarded", "1");
 
 		return String.format("forward:/audiencequestion/%s/%s/%s/?sessionkey=%s", arg1, arg2, arg3, sessionKey);
diff --git a/src/main/java/de/thm/arsnova/dao/CouchDBDao.java b/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
index 1e3915e9c3d0adec08d012b4351c10b5c648c695..5262cbe9a227ace7d31624f88ecda45514353b55 100644
--- a/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
+++ b/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
@@ -62,7 +62,6 @@ import de.thm.arsnova.entities.VisitedSession;
 import de.thm.arsnova.exceptions.ForbiddenException;
 import de.thm.arsnova.exceptions.NotFoundException;
 import de.thm.arsnova.exceptions.UnauthorizedException;
-import de.thm.arsnova.services.IFeedbackService;
 import de.thm.arsnova.services.ISessionService;
 import de.thm.arsnova.services.IUserService;
 
@@ -71,9 +70,6 @@ public class CouchDBDao implements IDatabaseDao {
 	@Autowired
 	private IUserService userService;
 
-	@Autowired
-	private IFeedbackService feedbackService;
-
 	@Autowired
 	private ISessionService sessionService;
 
@@ -133,7 +129,7 @@ public class CouchDBDao implements IDatabaseDao {
 			Session session = (Session) JSONObject.toBean(
 					d.getJSONObject().getJSONObject("value"),
 					Session.class
-			);
+					);
 			session.setCreator(d.getJSONObject().getJSONArray("key").getString(0));
 			session.setName(d.getJSONObject().getJSONArray("key").getString(1));
 			session.set_id(d.getId());
@@ -174,7 +170,7 @@ public class CouchDBDao implements IDatabaseDao {
 		return (Session) JSONObject.toBean(
 				results.getJSONArray("rows").optJSONObject(0).optJSONObject("value"),
 				Session.class
-		);
+				);
 	}
 
 	@Override
@@ -189,7 +185,7 @@ public class CouchDBDao implements IDatabaseDao {
 		return (Session) JSONObject.toBean(
 				results.getJSONArray("rows").optJSONObject(0).optJSONObject("value"),
 				Session.class
-		);
+				);
 	}
 
 	@Override
@@ -243,14 +239,14 @@ public class CouchDBDao implements IDatabaseDao {
 				com.fourspaces.couchdb.Session session = new com.fourspaces.couchdb.Session(
 						databaseHost,
 						databasePort
-				);
+						);
 				database = session.getDatabase(databaseName);
 			} catch (Exception e) {
 				LOGGER.error(
 						"Cannot connect to CouchDB database '" + databaseName
 						+ "' on host '" + databaseHost
 						+ "' using port " + databasePort
-				);
+						);
 			}
 		}
 
@@ -363,14 +359,14 @@ public class CouchDBDao implements IDatabaseDao {
 			Question q = (Question) JSONObject.toBean(
 					results.getJSONArray("rows").optJSONObject(0).optJSONObject("value"),
 					Question.class
-			);
+					);
 			JSONArray possibleAnswers = new JSONArray();
 			possibleAnswers = results.getJSONArray("rows").optJSONObject(0).optJSONObject("value")
 					.getJSONArray("possibleAnswers");
 			Collection<PossibleAnswer> answers = JSONArray.toCollection(
 					possibleAnswers,
 					PossibleAnswer.class
-			);
+					);
 			q.setPossibleAnswers(new ArrayList<PossibleAnswer>(answers));
 			q.setSessionKeyword(this.getSessionKeyword(q.getSessionId()));
 			return q;
@@ -461,7 +457,7 @@ public class CouchDBDao implements IDatabaseDao {
 			LOGGER.error("IOException: Could not delete question {}", question.get_id());
 		}
 	}
-	
+
 	@Override
 	public final void deleteAllQuestionsWithAnswers(Session session) {
 		NovaView view = new NovaView("skill_question/by_session");
@@ -472,7 +468,7 @@ public class CouchDBDao implements IDatabaseDao {
 		view.setStartKeyArray(session.get_id());
 		view.setEndKey(session.get_id(), "{}");
 		ViewResults results = this.getDatabase().view(view);
-		
+
 		for (Document d : results.getResults()) {
 			Question q = new Question();
 			q.set_id(d.getId());
@@ -529,7 +525,7 @@ public class CouchDBDao implements IDatabaseDao {
 		return (Answer) JSONObject.toBean(
 				results.getJSONArray("rows").optJSONObject(0).optJSONObject("value"),
 				Answer.class
-		);
+				);
 	}
 
 	@Override
@@ -554,7 +550,7 @@ public class CouchDBDao implements IDatabaseDao {
 			a.setQuestionId(d.getJSONObject().getJSONArray("key").getString(0));
 			a.setPiRound(piRound);
 			String answerText = d.getJSONObject().getJSONArray("key").getString(2);
-			a.setAnswerText(answerText == "null" ? null : answerText);
+			a.setAnswerText("null".equals(answerText) ? null : answerText);
 			answers.add(a);
 		}
 		return answers;
@@ -721,7 +717,7 @@ public class CouchDBDao implements IDatabaseDao {
 			InterposedQuestion question = (InterposedQuestion) JSONObject.toBean(
 					document.getJSONObject().getJSONObject("value"),
 					InterposedQuestion.class
-			);
+					);
 			question.setSessionId(sessionKey);
 			question.set_id(document.getId());
 			result.add(question);
@@ -850,8 +846,8 @@ public class CouchDBDao implements IDatabaseDao {
 			for (int i = 0; i < rows.size(); i++) {
 				JSONObject row = rows.getJSONObject(i);
 				if (
-					row.getString("key").equals(key)
-				) {
+						row.getString("key").equals(key)
+						) {
 					result += row.getInt("value");
 				}
 			}
@@ -899,9 +895,9 @@ public class CouchDBDao implements IDatabaseDao {
 			if (d.getJSONObject().optJSONArray("value") != null) {
 				@SuppressWarnings("unchecked")
 				Collection<Session> visitedSessions =  JSONArray.toCollection(
-					d.getJSONObject().getJSONArray("value"),
-					Session.class
-				);
+						d.getJSONObject().getJSONArray("value"),
+						Session.class
+						);
 				allSessions.addAll(visitedSessions);
 			}
 		}
@@ -989,7 +985,7 @@ public class CouchDBDao implements IDatabaseDao {
 			Session session = (Session) JSONObject.toBean(
 					d.getJSONObject().getJSONObject("value"),
 					Session.class
-			);
+					);
 			result.add(session);
 		}
 		return result;
@@ -1042,6 +1038,7 @@ public class CouchDBDao implements IDatabaseDao {
 			}
 		}
 
+		@Override
 		public String getQueryString() {
 			StringBuilder query = new StringBuilder();
 			if (super.getQueryString() != null) {
@@ -1055,7 +1052,9 @@ public class CouchDBDao implements IDatabaseDao {
 				query.append("keys=" + this.keys);
 			}
 
-			if (query.toString().isEmpty()) return null;
+			if (query.toString().isEmpty()) {
+				return null;
+			}
 			return query.toString();
 		}
 	}
@@ -1144,9 +1143,9 @@ public class CouchDBDao implements IDatabaseDao {
 			}
 		}
 		return getQuestions(new NovaView(viewName), session);
-		
+
 	}
-	
+
 	private List<Question> getQuestions(NovaView view, Session session) {
 		view.setStartKeyArray(session.get_id());
 		view.setEndKeyArray(session.get_id(), "{}");
@@ -1163,12 +1162,12 @@ public class CouchDBDao implements IDatabaseDao {
 			Question question = (Question) JSONObject.toBean(
 					document.getJSONObject().getJSONObject("value"),
 					Question.class
-			);
+					);
 			@SuppressWarnings("unchecked")
 			Collection<PossibleAnswer> answers = JSONArray.toCollection(
 					document.getJSONObject().getJSONObject("value").getJSONArray("possibleAnswers"),
 					PossibleAnswer.class
-			);
+					);
 			question.setPossibleAnswers(new ArrayList<PossibleAnswer>(answers));
 			question.setSessionKeyword(session.getKeyword());
 			if (!"freetext".equals(question.getQuestionType()) && 0 == question.getPiRound()) {
@@ -1194,7 +1193,7 @@ public class CouchDBDao implements IDatabaseDao {
 	public int getPreparationQuestionCount(Session session) {
 		return getQuestionCount(new NovaView("skill_question/preparation_question_count_by_session"), session);
 	}
-	
+
 	private int getQuestionCount(NovaView view, Session session) {
 		view.setKey(session.get_id());
 		ViewResults results = this.getDatabase().view(view);
@@ -1213,7 +1212,7 @@ public class CouchDBDao implements IDatabaseDao {
 	public int countPreparationQuestionAnswers(Session session) {
 		return countQuestionVariantAnswers(session, "preparation");
 	}
-	
+
 	private int countQuestionVariantAnswers(Session session, String variant) {
 		NovaView view = new NovaView("skill_question/count_answers_by_session_and_question_variant");
 		view.setKey(session.get_id(), variant);
@@ -1308,7 +1307,8 @@ public class CouchDBDao implements IDatabaseDao {
 		}
 		return ids;
 	}
-	
+
+	@Override
 	public void deleteAllInterposedQuestions(Session session) {
 		NovaView view = new NovaView("interposed_question/by_session");
 		view.setKey(session.get_id());
diff --git a/src/main/java/de/thm/arsnova/dao/NovaView.java b/src/main/java/de/thm/arsnova/dao/NovaView.java
index b9325b598ea5208be3412643ed0c31999ef2dc04..e525f06c32ff9c6dbb6d84a304f1e2f2c3e1d733 100644
--- a/src/main/java/de/thm/arsnova/dao/NovaView.java
+++ b/src/main/java/de/thm/arsnova/dao/NovaView.java
@@ -100,7 +100,7 @@ public class NovaView extends View {
 	private String quote(String string) {
 		return encode("\"" + string + "\"");
 	}
-	
+
 	private boolean isNumber(String string) {
 		return string.matches("^[0-9]+$");
 	}
diff --git a/src/main/java/de/thm/arsnova/services/SessionService.java b/src/main/java/de/thm/arsnova/services/SessionService.java
index 205ee49b743cfafe17347bbed23d3c8deca2323e..0d63d14a80ef35230a96756db568389880948199 100644
--- a/src/main/java/de/thm/arsnova/services/SessionService.java
+++ b/src/main/java/de/thm/arsnova/services/SessionService.java
@@ -128,8 +128,8 @@ public class SessionService implements ISessionService {
 		}
 
 		List<Session> courseSessions = databaseDao.getCourseSessions(
-			connectorClient.getCourses(user.getUsername()).getCourse()
-		);
+				connectorClient.getCourses(user.getUsername()).getCourse()
+				);
 
 		Map<String, Session> allAvailableSessions = new HashMap<String, Session>();
 
@@ -152,8 +152,8 @@ public class SessionService implements ISessionService {
 	public final Session saveSession(final Session session) {
 		if (connectorClient != null && session.getCourseId() != null) {
 			if (!connectorClient.getMembership(
-				userService.getCurrentUser().getUsername(), session.getCourseId()).isMember()
-			) {
+					userService.getCurrentUser().getUsername(), session.getCourseId()).isMember()
+					) {
 				throw new ForbiddenException();
 			}
 		}
diff --git a/src/main/java/de/thm/arsnova/services/UserService.java b/src/main/java/de/thm/arsnova/services/UserService.java
index 99521ec7530b50d628bd9b9555633967da72b3f4..73b5e79d4236370e7f8aaeee212ec028cd1020aa 100644
--- a/src/main/java/de/thm/arsnova/services/UserService.java
+++ b/src/main/java/de/thm/arsnova/services/UserService.java
@@ -86,17 +86,7 @@ public class UserService implements IUserService {
 		User user = null;
 
 		if (authentication instanceof OAuthAuthenticationToken) {
-			OAuthAuthenticationToken token = (OAuthAuthenticationToken) authentication;
-			if (token.getUserProfile() instanceof Google2Profile) {
-				Google2Profile profile = (Google2Profile) token.getUserProfile();
-				user = new User(profile);
-			} else if (token.getUserProfile() instanceof TwitterProfile) {
-				TwitterProfile profile = (TwitterProfile) token.getUserProfile();
-				user = new User(profile);
-			} else if (token.getUserProfile() instanceof FacebookProfile) {
-				FacebookProfile profile = (FacebookProfile) token.getUserProfile();
-				user = new User(profile);
-			}
+			user = getOAuthUser(authentication, user);
 		} else if (authentication instanceof CasAuthenticationToken) {
 			CasAuthenticationToken token = (CasAuthenticationToken) authentication;
 			user = new User(token.getAssertion().getPrincipal());
@@ -115,6 +105,21 @@ public class UserService implements IUserService {
 		return user;
 	}
 
+	private User getOAuthUser(Authentication authentication, User user) {
+		OAuthAuthenticationToken token = (OAuthAuthenticationToken) authentication;
+		if (token.getUserProfile() instanceof Google2Profile) {
+			Google2Profile profile = (Google2Profile) token.getUserProfile();
+			user = new User(profile);
+		} else if (token.getUserProfile() instanceof TwitterProfile) {
+			TwitterProfile profile = (TwitterProfile) token.getUserProfile();
+			user = new User(profile);
+		} else if (token.getUserProfile() instanceof FacebookProfile) {
+			FacebookProfile profile = (FacebookProfile) token.getUserProfile();
+			user = new User(profile);
+		}
+		return user;
+	}
+
 	@Override
 	public User getUser2SocketId(UUID socketId) {
 		return socketid2user.get(socketId);
diff --git a/src/main/java/de/thm/arsnova/socket/ARSnovaSocketIOServer.java b/src/main/java/de/thm/arsnova/socket/ARSnovaSocketIOServer.java
index d63372fa8b4155a7a0f24d16e70b3f2422db5c24..7fbb17ae61e3f4ec1a63cd14f63cbfb53d866bed 100644
--- a/src/main/java/de/thm/arsnova/socket/ARSnovaSocketIOServer.java
+++ b/src/main/java/de/thm/arsnova/socket/ARSnovaSocketIOServer.java
@@ -30,7 +30,6 @@ import de.thm.arsnova.entities.User;
 import de.thm.arsnova.events.ARSnovaEvent;
 import de.thm.arsnova.exceptions.NoContentException;
 import de.thm.arsnova.services.IFeedbackService;
-import de.thm.arsnova.services.IQuestionService;
 import de.thm.arsnova.services.ISessionService;
 import de.thm.arsnova.services.IUserService;
 import de.thm.arsnova.socket.message.Feedback;
@@ -41,9 +40,6 @@ public class ARSnovaSocketIOServer {
 	@Autowired
 	private IFeedbackService feedbackService;
 
-	@Autowired
-	private IQuestionService questionService;
-
 	@Autowired
 	private IUserService userService;
 
@@ -65,14 +61,14 @@ public class ARSnovaSocketIOServer {
 	public ARSnovaSocketIOServer() {
 		config = new Configuration();
 	}
-	
+
 	@PreDestroy
 	public void closeAllSessions() {
 		LOGGER.info("Close all websockets due to @PreDestroy");
 		for (SocketIOClient c : server.getAllClients()) {
 			c.disconnect();
 		}
-		
+
 		int clientCount = 0;
 		for (SocketIOClient c : server.getAllClients()) {
 			c.send(new Packet(PacketType.DISCONNECT));
@@ -135,7 +131,11 @@ public class ARSnovaSocketIOServer {
 		server.addDisconnectListener(new DisconnectListener() {
 			@Override
 			public void onDisconnect(SocketIOClient client) {
-				if (userService == null || client.getSessionId() == null || userService.getUser2SocketId(client.getSessionId()) == null) {
+				if (
+						userService == null
+						|| client.getSessionId() == null
+						|| userService.getUser2SocketId(client.getSessionId()) == null
+						) {
 					LOGGER.warn("NullPointer in ARSnovaSocketIOServer DisconnectListener");
 					return;
 				}
@@ -306,8 +306,8 @@ public class ARSnovaSocketIOServer {
 		broadcastInSession(sessionKey, "lecQuestionAvail", lecturerQuestionId);
 	}
 
-	/** Sends event to a websocket connection identified by UUID 
-	 * 
+	/** Sends event to a websocket connection identified by UUID
+	 *
 	 * @param sessionId The UUID of the websocket ID
 	 * @param event The event to be send to client
 	 * TODO This method is unimplemented!