diff --git a/src/main/java/nl/tudelft/ewi/queue/DatabaseLoader.java b/src/main/java/nl/tudelft/ewi/queue/DatabaseLoader.java
index 38c687714086084b7d0e65f0e1c658c984907bcf..3f0a43ff18477ea8e9faa4dea5521259b80d83f9 100644
--- a/src/main/java/nl/tudelft/ewi/queue/DatabaseLoader.java
+++ b/src/main/java/nl/tudelft/ewi/queue/DatabaseLoader.java
@@ -21,7 +21,6 @@ import nl.tudelft.ewi.queue.repository.RequestRepository;
 import nl.tudelft.ewi.queue.repository.RequestTypeRepository;
 import nl.tudelft.ewi.queue.repository.RoomRepository;
 import nl.tudelft.ewi.queue.repository.UserRepository;
-import com.mysql.cj.api.xdevapi.PasswordHandler;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -85,15 +84,7 @@ public class DatabaseLoader {
 
     @PostConstruct
     private void initDatabase() {
-        // Users
-
-        User student12 = userRepository.save(new User("studentCedille", "studentCedille", "ştudent12", "a@b" +
-                ".c", DefaultRole.ROLE_STUDENT, -2));
-
-        User student13 = new User("imusic", "", "***REMOVED*** Mušić",
-                "imusic@tudelft.net", DefaultRole.ROLE_STUDENT, -2);
-        saveUserWithCheck(student13);
-
+        // Normal students
         List<User> students = new ArrayList<>();
 
         for (int i = 1; i <= 100; i++) {
@@ -102,6 +93,21 @@ public class DatabaseLoader {
             userRepository.save(student);
         }
 
+    	// Special users
+        User student12 = userRepository.save(new User("studentCedille", "studentCedille", "��tudent12", "a@b" +
+                ".c", DefaultRole.ROLE_STUDENT, -2));
+        saveUserWithCheck(student12);
+
+        User student13 = new User("imusic", "", "***REMOVED*** Mu��i��",
+                "imusic@tudelft.net", DefaultRole.ROLE_STUDENT, -2);
+        saveUserWithCheck(student13);
+
+
+        User assistant1 = userRepository.save(dummyUser("assistant1", DefaultRole.ROLE_STUDENT));
+        User assistant2 = userRepository.save(dummyUser("assistant2", DefaultRole.ROLE_STUDENT));
+        User assistant3 = userRepository.save(dummyUser("assistant3", DefaultRole.ROLE_STUDENT));
+        User assistant4 = userRepository.save(dummyUser("assistant4", DefaultRole.ROLE_STUDENT));
+        
         User manager1 = userRepository.save(dummyUser("manager1", DefaultRole.ROLE_STUDENT));
         User manager2 = userRepository.save(dummyUser("manager2", DefaultRole.ROLE_STUDENT));
         User manager3 = userRepository.save(dummyUser("manager3", DefaultRole.ROLE_STUDENT));
@@ -166,6 +172,20 @@ public class DatabaseLoader {
             userRepository.save(student4);
         }
 
+        assistant1.addRole(new Assistant(assistant1, course1));
+        
+        assistant2.addRole(new Assistant(assistant2, course1));
+        assistant2.addRole(new Assistant(assistant2, course2));
+        
+        assistant3.addRole(new Assistant(assistant3, course1));
+        assistant3.addRole(new Assistant(assistant3, course2));
+        assistant3.addRole(new Assistant(assistant3, course3));
+        
+        assistant4.addRole(new Assistant(assistant4, course1));
+        assistant4.addRole(new Assistant(assistant4, course2));
+        assistant4.addRole(new Assistant(assistant4, course3));
+        assistant4.addRole(new Assistant(assistant4, course4));
+        
         manager1.addRole(new Manager(manager1, course1));
         manager2.addRole(new Manager(manager2, course2));
         manager3.addRole(new Manager(manager3, course2));
diff --git a/src/main/java/nl/tudelft/ewi/queue/controller/CourseController.java b/src/main/java/nl/tudelft/ewi/queue/controller/CourseController.java
index a9d6c7504d1e47f7e22faf33ff56fd724b2140a1..8cc190c79f6173cbdbaf7ba3dc7b31ac92fa3b77 100644
--- a/src/main/java/nl/tudelft/ewi/queue/controller/CourseController.java
+++ b/src/main/java/nl/tudelft/ewi/queue/controller/CourseController.java
@@ -42,7 +42,6 @@ import javax.persistence.EntityNotFoundException;
 import javax.validation.Valid;
 import java.io.IOException;
 import java.time.LocalDateTime;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.stream.Collectors;
diff --git a/src/main/java/nl/tudelft/ewi/queue/helper/BrightspaceCsvHelper.java b/src/main/java/nl/tudelft/ewi/queue/helper/BrightspaceCsvHelper.java
index 03ecec346aa7e09abc4f3498d79ec232d4f44733..2848bc4d0ef52ec3fa6f10afea104e5332ce4544 100644
--- a/src/main/java/nl/tudelft/ewi/queue/helper/BrightspaceCsvHelper.java
+++ b/src/main/java/nl/tudelft/ewi/queue/helper/BrightspaceCsvHelper.java
@@ -88,7 +88,8 @@ public class BrightspaceCsvHelper {
 
     public static ArrayList<BrightspaceCsvHelper> readCsv(MultipartFile csvFile) throws IOException {
         InputStream contents = csvFile.getInputStream();
-        Scanner scanner = new Scanner(contents).useDelimiter("\\A");
+        Scanner scanner = new Scanner(contents);
+        scanner.useDelimiter("\\A");
         ArrayList<BrightspaceCsvHelper> csvResultSet = new ArrayList<>();
         String csv = "";
         if (scanner.hasNext()) {
@@ -100,7 +101,7 @@ public class BrightspaceCsvHelper {
             Optional<BrightspaceCsvHelper> student = lineToCsvObject(studentGroup);
             student.ifPresent(csvResultSet::add);
         }
-        contents.close();
+        scanner.close();
         return csvResultSet;
     }
 
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/FirstYearStudent.java b/src/main/java/nl/tudelft/ewi/queue/model/FirstYearStudent.java
index 6440eb3f02d3963bd849f2efb5ea6805f745b379..d1bf67b1508464f2f0869bc2bbd8d35a2175ba56 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/FirstYearStudent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/FirstYearStudent.java
@@ -69,7 +69,8 @@ public class FirstYearStudent implements Serializable {
 
     public static ArrayList<List<String>> readCsv(MultipartFile csvFile) throws IOException {
         InputStream contents = csvFile.getInputStream();
-        Scanner scanner = new Scanner(contents).useDelimiter("\\A");
+        Scanner scanner = new Scanner(contents);
+        scanner.useDelimiter("\\A");
         ArrayList<List<String>> csvResultSet = new ArrayList<>();
         String csv = "";
         if (scanner.hasNext()) {
@@ -81,7 +82,7 @@ public class FirstYearStudent implements Serializable {
             List<String> mentorGroup = lineToFirstYearStudent(studentGroup);
             csvResultSet.add(mentorGroup);
         }
-        contents.close();
+        scanner.close();
         return csvResultSet;
     }
 
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/Group.java b/src/main/java/nl/tudelft/ewi/queue/model/Group.java
index 8f8392be5ebced5d6c3f4f90eb119efa698db67c..e8437c5096c78b19de40490a02771741daf121f0 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/Group.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/Group.java
@@ -11,7 +11,12 @@ import java.util.List;
 @Table(name="\"GROUP\"")
 public class Group extends RequestEntity {
 
-    @ManyToMany
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = 5164438526508141678L;
+
+	@ManyToMany
     private List<User> members = new ArrayList<>();
 
     @ManyToOne
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/Lab.java b/src/main/java/nl/tudelft/ewi/queue/model/Lab.java
index ddf12fbde1f3e6b496996d0c350c1b26fd7f0948..b2dd3414c5ed676dc5bc47d623971a679ecae250 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/Lab.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/Lab.java
@@ -31,7 +31,12 @@ import java.util.stream.Stream;
 @Where(clause = "deleted_at IS NULL")
 @EnableCaching
 public class Lab implements Serializable {
-    public final static String TIME_FORMAT = "dd/MM/yyyy HH:mm";
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = 4861827801551639673L;
+
+	public final static String TIME_FORMAT = "dd/MM/yyyy HH:mm";
 
     @Id
     @GeneratedValue
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestApprovedEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestApprovedEvent.java
index 8f2a25e943f416961f51d76f8d400ef431a36bf2..f0d9990642ce524c4467586c17536f5a0aad1980 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestApprovedEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestApprovedEvent.java
@@ -7,7 +7,12 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestApprovedEvent extends RequestEvent {
-    private LocalDateTime approvedAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = 992798464939565962L;
+
+	private LocalDateTime approvedAt;
 
     @Size(max=250)
     private String reason;
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestAssignedEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestAssignedEvent.java
index ea89a34a30b1d72d6d3a9724ed093532e6685b36..3fd4e2c1e3b9d92bcfc27b383eddd862554008e8 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestAssignedEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestAssignedEvent.java
@@ -6,7 +6,12 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestAssignedEvent extends RequestEvent {
-    protected LocalDateTime assignedAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = 7768507952136925203L;
+
+	protected LocalDateTime assignedAt;
 
     @ManyToOne
     protected User assignedTo;
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestCreatedEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestCreatedEvent.java
index de801c59da5d6726ce96a0931c91685be5acebdd..86e0b9ac34998f7a430ef0402e66b2036adf0378 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestCreatedEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestCreatedEvent.java
@@ -5,7 +5,11 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestCreatedEvent extends RequestEvent {
-    protected LocalDateTime createdAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = -6845911533535937239L;
+	protected LocalDateTime createdAt;
 
     public RequestCreatedEvent() {
         super();
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardToAnyEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardToAnyEvent.java
index 08251c472cd63325e890efed020100b8caded671..3ab0af4f6611e012adadac00229c4c347c79470a 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardToAnyEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardToAnyEvent.java
@@ -6,7 +6,12 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestForwardToAnyEvent extends RequestEvent {
-    private LocalDateTime forwardedAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = 3321677681535290268L;
+
+	private LocalDateTime forwardedAt;
 
     @Size(max=250)
     private String reason;
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardedEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardedEvent.java
index bcb05ac9ea484777574e31333685fc91a306ff59..96d7375fd09831595feedea9d36024f7d1072dbd 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardedEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestForwardedEvent.java
@@ -7,7 +7,12 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestForwardedEvent extends RequestEvent {
-    private LocalDateTime forwardedAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = -348089219618245506L;
+
+	private LocalDateTime forwardedAt;
 
     @ManyToOne
     private User forwardedTo;
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestProcessingEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestProcessingEvent.java
index 24d65a312df532f9d7d1e7277ea894b723d437d6..8b6856e77e659377d3ab0ee48e4361f389c75a47 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestProcessingEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestProcessingEvent.java
@@ -5,7 +5,11 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestProcessingEvent extends RequestEvent {
-    protected LocalDateTime processingAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = -5018900505348041016L;
+	protected LocalDateTime processingAt;
 
     public RequestProcessingEvent() {
         super();
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestRejectedEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestRejectedEvent.java
index a0f216ec6eaaa2b197473fc4b568d84b7128f1d8..9c813b738baf81925f81994175603a277b23269f 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestRejectedEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestRejectedEvent.java
@@ -7,7 +7,12 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestRejectedEvent extends RequestEvent {
-    private LocalDateTime rejectedAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = -6560217433195047238L;
+
+	private LocalDateTime rejectedAt;
 
     @Size(max=250)
     private String reason;
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/RequestRevokedEvent.java b/src/main/java/nl/tudelft/ewi/queue/model/RequestRevokedEvent.java
index 87b0f62bfbed1bfe9ff759f5463bd11857ddd423..0042e1be57ac8053a249001ecbc11c963d726a65 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/RequestRevokedEvent.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/RequestRevokedEvent.java
@@ -5,7 +5,11 @@ import java.time.LocalDateTime;
 
 @Entity
 public class RequestRevokedEvent extends RequestEvent {
-    private LocalDateTime revokedAt;
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = -5160734036008128989L;
+	private LocalDateTime revokedAt;
 
     public RequestRevokedEvent() {
         super();
diff --git a/src/main/java/nl/tudelft/ewi/queue/model/Subscription.java b/src/main/java/nl/tudelft/ewi/queue/model/Subscription.java
index 09aaaaa59cbfaa1a9cbe1da847471263d1c84e40..14bfa54b70b86f08028850e30d0dcf7181880bc0 100644
--- a/src/main/java/nl/tudelft/ewi/queue/model/Subscription.java
+++ b/src/main/java/nl/tudelft/ewi/queue/model/Subscription.java
@@ -17,7 +17,12 @@ import java.util.Base64;
 
 @Entity
 public class Subscription implements Serializable {
-    @Id
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = -1247750903720299588L;
+
+	@Id
     private String endpoint;
 
     private String key;
diff --git a/src/main/java/nl/tudelft/ewi/queue/service/GroupService.java b/src/main/java/nl/tudelft/ewi/queue/service/GroupService.java
index 26492eca182cd14e89517cf42a7fc5dadd0be528..4d36aff2cf81674545a1994859afe75a34d1b8ba 100644
--- a/src/main/java/nl/tudelft/ewi/queue/service/GroupService.java
+++ b/src/main/java/nl/tudelft/ewi/queue/service/GroupService.java
@@ -5,7 +5,6 @@ import nl.tudelft.ewi.queue.model.Course;
 import nl.tudelft.ewi.queue.model.DefaultRole;
 import nl.tudelft.ewi.queue.model.FirstYearStudent;
 import nl.tudelft.ewi.queue.model.Group;
-import nl.tudelft.ewi.queue.model.Student;
 import nl.tudelft.ewi.queue.model.User;
 import nl.tudelft.ewi.queue.repository.CourseRepository;
 import nl.tudelft.ewi.queue.repository.FirstYearStudentRepository;
@@ -14,16 +13,11 @@ import nl.tudelft.ewi.queue.repository.UserRepository;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.io.IOException;
-import java.time.LocalDateTime;
 import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
 
 @Service
 public class GroupService {
diff --git a/src/test/java/nl/tudelft/ewi/queue/controller/RequestControllerTest.java b/src/test/java/nl/tudelft/ewi/queue/controller/RequestControllerTest.java
index 074ffde8ba1e4b72a696774f100a344d71d11970..843051c25fe014effeed387cc0da7b52e7f780bc 100644
--- a/src/test/java/nl/tudelft/ewi/queue/controller/RequestControllerTest.java
+++ b/src/test/java/nl/tudelft/ewi/queue/controller/RequestControllerTest.java
@@ -141,7 +141,7 @@ public class RequestControllerTest {
     @Test
     @WithUserDetails("teacher1")
     public void testRejectARequestPost() throws Exception {
-        User assistant = userRepository.findByUsername("student2");
+        User assistant = userRepository.findByUsername("assistant1");
         RequestProcessingEvent processing = new RequestProcessingEvent(request, LocalDateTime.now());
         RequestAssignedEvent assigned = new RequestAssignedEvent(request, LocalDateTime.now(), assistant);
         request.addEvent(processing);
@@ -173,7 +173,7 @@ public class RequestControllerTest {
     @Transactional
     @WithUserDetails("teacher1")
     public void testForwardRequestPost() throws Exception {
-        User assistant = userRepository.findByUsername("student2");
+        User assistant = userRepository.findByUsername("assistant2");
         request.setAssistant(assistant);
         requestRepository.save(request);
 
@@ -181,7 +181,7 @@ public class RequestControllerTest {
                 .perform(
                         post("/request/" + request.getId() + "?forward=")
                                 .with(csrf())
-                                .param("assistant", "8")
+                                .param("assistant", "3")
                                 .param("comment", "What is this, I don't even")
                 )
                 .andExpect(status().is3xxRedirection())
diff --git a/src/test/java/nl/tudelft/ewi/queue/model/LabTest.java b/src/test/java/nl/tudelft/ewi/queue/model/LabTest.java
index 3842796586a5cc07bd5b4ab150f807949b82b9ac..50c8466a9e26a4578c9fcb66f6f841518e444cff 100644
--- a/src/test/java/nl/tudelft/ewi/queue/model/LabTest.java
+++ b/src/test/java/nl/tudelft/ewi/queue/model/LabTest.java
@@ -77,7 +77,8 @@ public class LabTest {
 	@Test
 	@Transactional
 	public void testIsEnqueuedEmptyQueue() {
-		User randomUser = userRepository.findByUsername("student3");
+		// student chosen by random dice roll (also: above 25)
+		User randomUser = userRepository.findByUsername("student42");
 		Assert.assertFalse(lab.isEnqueued(randomUser));
 	}
 
@@ -118,7 +119,7 @@ public class LabTest {
 	@Test
 	@Transactional
 	public void testEnqueueWithoutEnroll() {
-		User randomUser = userRepository.findByUsername("student11");
+		User randomUser = userRepository.findByUsername("student43"); //again... random + 1
 		Assert.assertFalse(lab.isEnqueued(randomUser));
 		Assert.assertFalse(lab.getCourse().isEnrolled(randomUser));
 		Request request = new Request(user, null, new Room("DW 101"), submissionRequestType, "", lab);
@@ -131,7 +132,7 @@ public class LabTest {
 	public void testGetQueue() {
 		List<Request> queue = lab.getQueue();
 		Assert.assertNotNull(queue);
-		Assert.assertEquals(1, queue.size());
+		Assert.assertEquals(25, queue.size()); // adapted to state in DatabaseLoader
 	}
 
 	@Test
@@ -139,7 +140,7 @@ public class LabTest {
 	public void testGetPending() {
 		List<Request> pending = lab.getPending();
 		Assert.assertNotNull(pending);
-		Assert.assertEquals(1, pending.size());
+		Assert.assertEquals(25, pending.size());	// adapted to state in DatabaseLoader
 		Assert.assertEquals(pending.get(0).getRequestEntity().getDisplayName(), "student1");
 	}