- fixes implementation difference for large file upload session

Author: baywet

src/main/java/com/microsoft/graph/core/models/IUploadSession.java

@@ -29,7 +29,7 @@ public interface IUploadSession extends Parsable, AdditionalDataHolder {
      * A collection of byte ranges that the server is missing for the file. These ranges are zero indexed and of the format 'start-end' (e.g. '0-26' to indicate the first 27 bytes of the file). When uploading files as Outlook attachments, instead of a collection of ranges, this property always indicates a single value '{start}', the location in the file where the next upload should begin.
      * @return the Next Expected Ranges.
      */
-    @Nonnull
+    @Nullable
     List<String> getNextExpectedRanges();
     /**
      * Sets the ranges that are yet to be uploaded.

src/main/java/com/microsoft/graph/core/models/UploadSession.java

@@ -55,9 +55,12 @@ public void setUploadUrl(@Nonnull final String uploadUrl) {
      * Get the next upload byte ranges to be uploaded.
      * @return The byte ranges to be uploaded.
      */
-    @Nonnull
+    @Nullable
     @Override
     public List<String> getNextExpectedRanges() {
+        if (nextExpectedRanges == null) {
+            return null;
+        }
         return new ArrayList<>(nextExpectedRanges);
     }
     /**

src/test/java/com/microsoft/graph/core/requests/upload/UploadSessionTest.java

@@ -0,0 +1,19 @@
+package com.microsoft.graph.core.requests.upload;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import com.microsoft.graph.core.models.UploadSession;
+
+class UploadSessionTest {
+    @Test
+    void getNextExpectedRangesDoesNotFailOnDefault()
+    {
+        final UploadSession uploadSession = new UploadSession();
+        final List<String> result = uploadSession.getNextExpectedRanges();
+        assertNull(result);
+    }
+}