diff --git a/src/main/java/io/anserini/collection/JsonDenseVectorCollection.java b/src/main/java/io/anserini/collection/JsonDenseVectorCollection.java
index 5fcebb302..1a69da85f 100644
--- a/src/main/java/io/anserini/collection/JsonDenseVectorCollection.java
+++ b/src/main/java/io/anserini/collection/JsonDenseVectorCollection.java
@@ -24,7 +24,6 @@
 import java.util.HashMap;
 import java.util.Map;
 
-
 /**
  * A document collection for encoded dense vectors for ANN (HNSW) search.
  * The "vector" field are concatenated into the "contents" field for indexing.
@@ -43,7 +42,8 @@ public FileSegment<JsonDenseVectorCollection.Document> createFileSegment(Path p)
   }
 
   @Override
-  public FileSegment<JsonDenseVectorCollection.Document> createFileSegment(BufferedReader bufferedReader) throws IOException {
+  public FileSegment<JsonDenseVectorCollection.Document> createFileSegment(BufferedReader bufferedReader)
+      throws IOException {
     return new JsonDenseVectorCollection.Segment<>(bufferedReader);
   }
 
@@ -75,14 +75,14 @@ public Document(JsonNode json) {
       this.id = json.get("docid").asText();
       this.contents = json.get("vector").toString();
       JsonNode vectorNode = json.get("vector");
-        if (vectorNode != null && vectorNode.isArray()) {
-            vectorData = new float[vectorNode.size()];
-            for (int i = 0; i < vectorNode.size(); i++) {
-                vectorData[i] = (float) vectorNode.get(i).asDouble();
-            }
-        } else {
-            vectorData = null;
+      if (vectorNode != null && vectorNode.isArray()) {
+        vectorData = new float[vectorNode.size()];
+        for (int i = 0; i < vectorNode.size(); i++) {
+          vectorData[i] = (float) vectorNode.get(i).asDouble();
         }
+      } else {
+        vectorData = null;
+      }
       // We're not going to index any other fields, so just initialize an empty map.
       this.fields = new HashMap<>();
     }
diff --git a/src/main/java/io/anserini/collection/JsonVectorCollection.java b/src/main/java/io/anserini/collection/JsonVectorCollection.java
index 8daab1217..5516cefe8 100644
--- a/src/main/java/io/anserini/collection/JsonVectorCollection.java
+++ b/src/main/java/io/anserini/collection/JsonVectorCollection.java
@@ -23,8 +23,7 @@
 import java.nio.file.Path;
 
 /**
- * A JSON document collection where the user can specify directly the vector to
- * be indexed.
+ * A JSON document collection where the user can specify directly the vector to be indexed.
  */
 public class JsonVectorCollection extends DocumentCollection<JsonVectorCollection.Document> {
   public JsonVectorCollection(Path path) {
@@ -40,8 +39,7 @@ public FileSegment<JsonVectorCollection.Document> createFileSegment(Path p) thro
   }
 
   @Override
-  public FileSegment<JsonVectorCollection.Document> createFileSegment(BufferedReader bufferedReader)
-      throws IOException {
+  public FileSegment<JsonVectorCollection.Document> createFileSegment(BufferedReader bufferedReader) throws IOException {
     return new JsonVectorCollection.Segment<>(bufferedReader);
   }
 
@@ -67,8 +65,7 @@ public static class Document extends JsonCollection.Document {
     public Document(JsonNode json) {
       super(json);
 
-      // We're going to take the map associated with "vector" and generate
-      // pseudo-document.
+      // We're going to take the map associated with "vector" and generate pseudo-document.
       JsonNode vectorNode = json.get("vector");
 
       if (vectorNode.isArray()) {
diff --git a/src/test/java/io/anserini/collection/JsonVectorCollectionTest.java b/src/test/java/io/anserini/collection/JsonVectorCollectionTest.java
index 4a9a0c794..4f567fc76 100644
--- a/src/test/java/io/anserini/collection/JsonVectorCollectionTest.java
+++ b/src/test/java/io/anserini/collection/JsonVectorCollectionTest.java
@@ -18,7 +18,7 @@
 
 import java.util.Map;
 import org.junit.Test;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertArrayEquals;;
 
 public abstract class JsonVectorCollectionTest extends DocumentCollectionTest<JsonVectorCollection.Document> {
   @Override