diff --git a/src/app/access-control/group-registry/groups-registry.component.ts b/src/app/access-control/group-registry/groups-registry.component.ts
index 29ec1770a7..1770762a34 100644
--- a/src/app/access-control/group-registry/groups-registry.component.ts
+++ b/src/app/access-control/group-registry/groups-registry.component.ts
@@ -9,7 +9,7 @@ import {
   of as observableOf,
   Subscription
 } from 'rxjs';
-import { catchError, map, switchMap, take, tap } from 'rxjs/operators';
+import { catchError, map, switchMap, tap } from 'rxjs/operators';
 import { DSpaceObjectDataService } from '../../core/data/dspace-object-data.service';
 import { AuthorizationDataService } from '../../core/data/feature-authorization/authorization-data.service';
 import { FeatureID } from '../../core/data/feature-authorization/feature-id';
diff --git a/src/app/collection-page/delete-collection-page/delete-collection-page.component.ts b/src/app/collection-page/delete-collection-page/delete-collection-page.component.ts
index 4c3e003773..1876936efb 100644
--- a/src/app/collection-page/delete-collection-page/delete-collection-page.component.ts
+++ b/src/app/collection-page/delete-collection-page/delete-collection-page.component.ts
@@ -5,7 +5,6 @@ import { NotificationsService } from '../../shared/notifications/notifications.s
 import { CollectionDataService } from '../../core/data/collection-data.service';
 import { Collection } from '../../core/shared/collection.model';
 import { TranslateService } from '@ngx-translate/core';
-import { RequestService } from '../../core/data/request.service';
 
 /**
  * Component that represents the page where a user can delete an existing Collection
diff --git a/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.spec.ts b/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.spec.ts
index aaf2185811..2b473bf037 100644
--- a/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.spec.ts
+++ b/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.spec.ts
@@ -12,7 +12,6 @@ import { NotificationsService } from '../../../shared/notifications/notification
 import { Item } from '../../../core/shared/item.model';
 import { ItemTemplateDataService } from '../../../core/data/item-template-data.service';
 import { Collection } from '../../../core/shared/collection.model';
-import { ObjectCacheService } from '../../../core/cache/object-cache.service';
 import { RequestService } from '../../../core/data/request.service';
 import { createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
 import { getCollectionItemTemplateRoute } from '../../collection-page-routing-paths';
diff --git a/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.ts b/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.ts
index 57248cdaed..d4396fce17 100644
--- a/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.ts
+++ b/src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.ts
@@ -8,10 +8,9 @@ import { combineLatest as combineLatestObservable, Observable } from 'rxjs';
 import { RemoteData } from '../../../core/data/remote-data';
 import { Item } from '../../../core/shared/item.model';
 import { getFirstSucceededRemoteDataPayload } from '../../../core/shared/operators';
-import { switchMap, tap } from 'rxjs/operators';
+import { switchMap } from 'rxjs/operators';
 import { NotificationsService } from '../../../shared/notifications/notifications.service';
 import { TranslateService } from '@ngx-translate/core';
-import { ObjectCacheService } from '../../../core/cache/object-cache.service';
 import { RequestService } from '../../../core/data/request.service';
 import { getCollectionItemTemplateRoute } from '../../collection-page-routing-paths';
 
diff --git a/src/app/community-page/delete-community-page/delete-community-page.component.ts b/src/app/community-page/delete-community-page/delete-community-page.component.ts
index 3160d94be9..6e640c64be 100644
--- a/src/app/community-page/delete-community-page/delete-community-page.component.ts
+++ b/src/app/community-page/delete-community-page/delete-community-page.component.ts
@@ -5,7 +5,6 @@ import { ActivatedRoute, Router } from '@angular/router';
 import { DeleteComColPageComponent } from '../../shared/comcol/comcol-forms/delete-comcol-page/delete-comcol-page.component';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
 import { TranslateService } from '@ngx-translate/core';
-import { RequestService } from '../../core/data/request.service';
 
 /**
  * Component that represents the page where a user can delete an existing Community
diff --git a/src/app/core/data/comcol-data.service.spec.ts b/src/app/core/data/comcol-data.service.spec.ts
index 180eb36461..dffc97f294 100644
--- a/src/app/core/data/comcol-data.service.spec.ts
+++ b/src/app/core/data/comcol-data.service.spec.ts
@@ -22,7 +22,6 @@ import {
 import { BitstreamDataService } from './bitstream-data.service';
 import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
-import { DSpaceObject } from '../shared/dspace-object.model';
 import { Bitstream } from '../shared/bitstream.model';
 
 const LINK_NAME = 'test';
diff --git a/src/app/shared/comcol/comcol-forms/delete-comcol-page/delete-comcol-page.component.ts b/src/app/shared/comcol/comcol-forms/delete-comcol-page/delete-comcol-page.component.ts
index 46b8f63bc1..94f46088aa 100644
--- a/src/app/shared/comcol/comcol-forms/delete-comcol-page/delete-comcol-page.component.ts
+++ b/src/app/shared/comcol/comcol-forms/delete-comcol-page/delete-comcol-page.component.ts
@@ -7,7 +7,6 @@ import { NotificationsService } from '../../../notifications/notifications.servi
 import { TranslateService } from '@ngx-translate/core';
 import { getFirstCompletedRemoteData } from '../../../../core/shared/operators';
 import { NoContent } from '../../../../core/shared/NoContent.model';
-import { RequestService } from '../../../../core/data/request.service';
 import { ComColDataService } from '../../../../core/data/comcol-data.service';
 import { Community } from '../../../../core/shared/community.model';
 import { Collection } from '../../../../core/shared/collection.model';
diff --git a/src/app/shared/item/item-versions/item-versions.component.spec.ts b/src/app/shared/item/item-versions/item-versions.component.spec.ts
index ebe0d81cf2..e9891a049d 100644
--- a/src/app/shared/item/item-versions/item-versions.component.spec.ts
+++ b/src/app/shared/item/item-versions/item-versions.component.spec.ts
@@ -1,10 +1,9 @@
 import { ItemVersionsComponent } from './item-versions.component';
 import {
-  ComponentFixture, discardPeriodicTasks, fakeAsync, flush, flushMicrotasks, TestBed, tick, waitForAsync
+  ComponentFixture, TestBed, waitForAsync
 } from '@angular/core/testing';
 import { VarDirective } from '../../utils/var.directive';
 import { TranslateModule } from '@ngx-translate/core';
-import { RouterTestingModule } from '@angular/router/testing';
 import { NO_ERRORS_SCHEMA } from '@angular/core';
 import { Item } from '../../../core/shared/item.model';
 import { Version } from '../../../core/shared/version.model';
@@ -27,10 +26,8 @@ import { FeatureID } from '../../../core/data/feature-authorization/feature-id';
 import { WorkspaceitemDataService } from '../../../core/submission/workspaceitem-data.service';
 import { WorkflowItemDataService } from '../../../core/submission/workflowitem-data.service';
 import { ConfigurationDataService } from '../../../core/data/configuration-data.service';
-import { Group } from '../../../core/eperson/models/group.model';
 import { Router } from '@angular/router';
-import { RouterStub } from '../../testing/router.stub';
-import { NgbModal, NgbModule } from '@ng-bootstrap/ng-bootstrap';
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
 import { CommonModule } from '@angular/common';
 
 describe('ItemVersionsComponent', () => {