Formatting, @nullable annotations

Author: afranken

server/src/main/java/com/adobe/testing/s3mock/BucketController.java

@@ -478,9 +478,15 @@ public ResponseEntity<ListVersionsResult> listObjectVersions(
     bucketService.verifyBucketExists(bucketName);
     bucketService.verifyMaxKeys(maxKeys);
     bucketService.verifyEncodingType(encodingType);
-    var listVersionsResult =
-        bucketService.listVersions(bucketName, prefix, delimiter, encodingType, maxKeys, keyMarker,
-            versionIdMarker);
+    var listVersionsResult = bucketService.listVersions(
+        bucketName,
+        prefix,
+        delimiter,
+        encodingType,
+        maxKeys,
+        keyMarker,
+        versionIdMarker
+    );
 
     return ResponseEntity.ok(listVersionsResult);
   }

server/src/main/java/com/adobe/testing/s3mock/service/BucketService.java

@@ -253,13 +253,15 @@ public List<S3Object> getS3Objects(String bucketName, @Nullable String prefix) {
         .toList();
   }
 
-  public ListVersionsResult listVersions(String bucketName,
-      String prefix,
-      String delimiter,
-      String encodingType,
+  public ListVersionsResult listVersions(
+      String bucketName,
+      @Nullable String prefix,
+      @Nullable String delimiter,
+      @Nullable String encodingType,
       Integer maxKeys,
-      String keyMarker,
-      String versionIdMarker) {
+      @Nullable String keyMarker,
+      @Nullable String versionIdMarker
+  ) {
     var result = listObjectsV1(bucketName, prefix, delimiter, keyMarker, encodingType, maxKeys);
 
     var bucket = bucketStore.getBucketMetadata(bucketName);