Resolve ""Error: Exercise could not be found..." during resource loading"

Related to #526 (closed)

src/main/java/at/ac/uibk/gitsearch/service/AuditEventService.java

@@ -7,6 +7,7 @@ import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 import java.util.List;
 import java.util.Optional;
+import java.util.concurrent.atomic.AtomicInteger;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.boot.actuate.audit.AuditEvent;
@@ -62,8 +63,9 @@ public class AuditEventService {
    * This is scheduled to get fired at 11:00 (pm) UTC.
    */
   @Scheduled(cron = "0 0 23 * * ?")
-  public void removeOldAuditEvents() {
+  public int removeOldAuditEvents() {
     boolean next = true;
+    AtomicInteger count = new AtomicInteger(0);
 
     while (next) {
       next =
@@ -74,12 +76,14 @@ public class AuditEventService {
               final List<PersistentAuditEvent> auditEventDeleteCandidates = persistenceAuditEventRepository.findTop1000ByAuditEventDateBefore(
                 Instant.now().minus(jHipsterProperties.getAuditEvents().getRetentionPeriod(), ChronoUnit.DAYS)
               );
+              count.set(count.intValue() + auditEventDeleteCandidates.size());
               persistenceAuditEventRepository.deleteAll(auditEventDeleteCandidates);
               return !auditEventDeleteCandidates.isEmpty();
             }
           }
         );
     }
+    return count.intValue();
     // not working, due to https://hibernate.atlassian.net/browse/HHH-5528
     //        int count = persistenceAuditEventRepository.deleteInBulkByRoleId(
     //            Instant.now().minus(jHipsterProperties.getAuditEvents().getRetentionPeriod(), ChronoUnit.DAYS)