Add @SuppressWarnings

src/main/java/org/apache/commons/lang3/tuple/ImmutablePair.java

@@ -94,6 +94,7 @@ public class ImmutablePair<L, R> extends Pair<L, R> {
      * @return an immutable pair of nulls.
      * @since 3.6
      */
+    @SuppressWarnings("unchecked")
     public static <L, R> ImmutablePair<L, R> nullPair() {
         return NULL;
     }

src/main/java/org/apache/commons/lang3/tuple/ImmutableTriple.java

@@ -80,6 +80,7 @@ public class ImmutableTriple<L, M, R> extends Triple<L, M, R> {
      * @return an immutable triple of nulls.
      * @since 3.6
      */
+    @SuppressWarnings("unchecked")
     public static <L, M, R> ImmutableTriple<L, M, R> nullTriple() {
         return NULL;
     }