Exam mode: Only send student notifications when end time has changed

src/main/java/de/tum/in/www1/artemis/repository/ExamLiveEventRepository.java

@@ -1,6 +1,6 @@
 package de.tum.in.www1.artemis.repository;
 
-import java.util.List;
+import java.util.*;
 
 import javax.transaction.Transactional;
 
@@ -32,6 +32,20 @@
             """)
     List<ExamLiveEvent> findAllByStudentExamIdOrGlobalByExamId(@Param("examId") Long examId, @Param("studentExamId") Long studentExamId);
 
+    /**
+     * Find all events for the given student exam in reverse creation order.
+     *
+     * @param studentExamId the id of the student exam
+     * @return a list of events
+     */
+    @Query("""
+            SELECT event
+            FROM ExamLiveEvent event
+            WHERE event.studentExamId = :studentExamId
+            ORDER BY event.id DESC
+            """)
+    List<ExamLiveEvent> findAllByStudentExamId(@Param("studentExamId") Long studentExamId);
+
     /**
      * Delete all events for the given exam.
      *

src/main/java/de/tum/in/www1/artemis/web/rest/ExamResource.java

@@ -229,7 +229,7 @@ public ResponseEntity<Exam> updateExam(@PathVariable Long courseId, @RequestBody
         }
 
         // NOTE: if the end date was changed, we need to update student exams and re-schedule exercises
-        if (!originalExam.getEndDate().equals(savedExam.getEndDate())) {
+        if (comparator.compare(originalExam.getEndDate(), savedExam.getEndDate()) != 0) {
             int workingTimeChange = savedExam.getDuration() - originalExamDuration;
             updateStudentExamsAndRescheduleExercises(examWithExercises, originalExamDuration, workingTimeChange);
         }

src/test/java/de/tum/in/www1/artemis/exam/ExamFactory.java

@@ -3,8 +3,7 @@
 import static java.time.ZonedDateTime.now;
 
 import java.time.ZonedDateTime;
-import java.util.HashSet;
-import java.util.Set;
+import java.util.*;
 
 import de.tum.in.www1.artemis.domain.Course;
 import de.tum.in.www1.artemis.domain.exam.*;
@@ -136,7 +135,6 @@
      *
      * @param mandatory if the exercise group is mandatory
      * @param exam      the exam that this exercise group should be added to
-     *
      * @return the newly created exercise
      */
     public static ExerciseGroup generateExerciseGroup(boolean mandatory, Exam exam) {
@@ -149,7 +147,6 @@
      * @param mandatory if the exercise group is mandatory
      * @param exam      the exam that this exercise group should be added to
      * @param title     title of the exercise group
-     *
      * @return the newly created exercise
      */
     public static ExerciseGroup generateExerciseGroupWithTitle(boolean mandatory, Exam exam, String title) {