diff --git a/src/main/java/ch/sbb/polarion/extension/pdf_exporter/rest/model/conversion/ExportParams.java b/src/main/java/ch/sbb/polarion/extension/pdf_exporter/rest/model/conversion/ExportParams.java
index 13cb0ba..a7ad8c0 100644
--- a/src/main/java/ch/sbb/polarion/extension/pdf_exporter/rest/model/conversion/ExportParams.java
+++ b/src/main/java/ch/sbb/polarion/extension/pdf_exporter/rest/model/conversion/ExportParams.java
@@ -12,7 +12,6 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 
 @Data
 @Builder
diff --git a/src/main/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProvider.java b/src/main/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProvider.java
index 6d3cf9d..321e2bf 100644
--- a/src/main/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProvider.java
+++ b/src/main/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProvider.java
@@ -109,16 +109,17 @@ boolean isMediaTypeMismatch(String resource, byte[] content) {
     }
 
     @VisibleForTesting
+    @SuppressWarnings("java:S1075")
     byte[] getDefaultContent(String resource) throws IOException {
-        String defaultImagePath;
+        String pathToDefaultImage;
         if (WorkItemAttachmentUrlResolver.isSvg(resource)) {
-            defaultImagePath = "/webapp/ria/images/image_not_accessible_svg.png";
+            pathToDefaultImage = "/webapp/ria/images/image_not_accessible_svg.png";
         } else if (!StringUtils.isEmpty(MediaUtils.getImageFormat(resource))) {
-            defaultImagePath = "/webapp/ria/images/image_not_accessible.png";
+            pathToDefaultImage = "/webapp/ria/images/image_not_accessible.png";
         } else {
             return new byte[0];
         }
-        File defaultImage = new File(BundleHelper.getPath("com.polarion.alm.ui", defaultImagePath));
+        File defaultImage = new File(BundleHelper.getPath("com.polarion.alm.ui", pathToDefaultImage));
         return StreamUtils.suckStreamThenClose(new FileInputStream(defaultImage));
     }
 
diff --git a/src/test/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProviderTest.java b/src/test/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProviderTest.java
index 17e8f97..ba20782 100644
--- a/src/test/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProviderTest.java
+++ b/src/test/java/ch/sbb/polarion/extension/pdf_exporter/util/PdfExporterFileResourceProviderTest.java
@@ -34,9 +34,6 @@
         PlatformContextMockExtension.class
 })
 class PdfExporterFileResourceProviderTest {
-    @Mock
-    PdfExporterFileResourceProvider resourceProviderMock;
-
     @Mock
     private IUrlResolver resolverMock;
 
@@ -64,6 +61,7 @@ void replaceImagesAsBase64EncodedTest() {
             imgBytes = is != null ? is.readAllBytes() : new byte[0];
         }
 
+        PdfExporterFileResourceProvider resourceProviderMock = mock(PdfExporterFileResourceProvider.class);
         when(resourceProviderMock.getResourceAsBytes("http://localhost/some-path/img.png", null)).thenReturn(imgBytes);
         when(resourceProviderMock.getResourceAsBase64String(any(), eq(null))).thenCallRealMethod();
         String result = resourceProviderMock.getResourceAsBase64String("http://localhost/some-path/img.png", null);
@@ -128,8 +126,8 @@ void getWorkItemIdFromAttachmentUrlValidUrl() {
 
     @Test
     void getWorkItemIdFromAttachmentUrlInvalidUrl() {
-        String url = "http://example.com/invalid/url";
-        String result = resourceProviderMock.getWorkItemIdFromAttachmentUrl(url);
+        String url = "/http://example.com/invalid/url";
+        String result = resourceProvider.getWorkItemIdFromAttachmentUrl(url);
         assertNull(result);
     }
 
@@ -144,7 +142,7 @@ void isMediaTypeMismatchMatchingMimeTypes() {
             mockedMediaUtils.when(() -> MediaUtils.getMimeTypeUsingTikaByResourceName(resource, null))
                     .thenReturn("image/png");
 
-            boolean result = resourceProviderMock.isMediaTypeMismatch(resource, content);
+            boolean result = resourceProvider.isMediaTypeMismatch(resource, content);
             assertFalse(result);
         }
     }
@@ -157,8 +155,8 @@ void getDefaultContentEmptyForNonImage() {
             mockedMediaUtils.when(() -> MediaUtils.getImageFormat(resource))
                     .thenReturn("");
 
-            byte[] content = resourceProviderMock.getDefaultContent(resource);
-            assertNull(content);
+            byte[] content = resourceProvider.getDefaultContent(resource);
+            assertArrayEquals(new byte[0], content);
         }
     }