From aa6c2b48c148b034722510924e3aa1a61c6407fb Mon Sep 17 00:00:00 2001
From: nicovdijk <nicovdijk@gmail.com>
Date: Mon, 18 Oct 2021 16:33:14 +0200
Subject: [PATCH] updated copyright year and a code comment

---
 .../ml/dmlc/xgboost4j/scala/spark/params/Utils.scala      | 8 ++++----
 .../scala/ml/dmlc/xgboost4j/scala/spark/CustomObj.scala   | 2 +-
 .../ml/dmlc/xgboost4j/scala/spark/PersistenceSuite.scala  | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/Utils.scala b/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/Utils.scala
index cd4d588f788b..ddbef93747f8 100644
--- a/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/Utils.scala
+++ b/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/Utils.scala
@@ -1,5 +1,5 @@
 /*
- Copyright (c) 2014 by Contributors
+ Copyright (c) 2014,2021 by Contributors
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
@@ -35,7 +35,7 @@ private[spark] object Utils {
 
   /**
    * Get the TypeHints according to the value
-   * @param value the instance of customized obj/eval
+   * @param value the instance of class to be serialized
    * @return if value is null,
    *            return NoTypeHints
    *         else return the FullTypeHints.
@@ -44,9 +44,9 @@ private[spark] object Utils {
    *         so we can find the jsonClass and turn it to FullTypeHints when deserializing.
    */
   def getTypeHintsFromClass(value: Any): TypeHints = {
-    if (value == null) {
+    if (value == null) { // XGBoost will save the default value (null)
       NoTypeHints
-    } else { // XGBoost will save the default values
+    } else { // XGBoost will save the full instance
       FullTypeHints(List(value.getClass))
     }
   }
diff --git a/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/CustomObj.scala b/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/CustomObj.scala
index 432a950dcb7e..b9a39a14d4f7 100644
--- a/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/CustomObj.scala
+++ b/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/CustomObj.scala
@@ -1,5 +1,5 @@
 /*
- Copyright (c) 2014 by Contributors
+ Copyright (c) 2021 by Contributors
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
diff --git a/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/PersistenceSuite.scala b/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/PersistenceSuite.scala
index 788436e89017..a1732c7f7e1b 100755
--- a/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/PersistenceSuite.scala
+++ b/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/PersistenceSuite.scala
@@ -1,5 +1,5 @@
 /*
- Copyright (c) 2014 by Contributors
+ Copyright (c) 2014,2021 by Contributors
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.