Remove a warning. Tidy EOL white space.
diff --git a/jena-extras/jena-querybuilder/src/main/java/org/apache/jena/arq/querybuilder/handlers/DatasetHandler.java b/jena-extras/jena-querybuilder/src/main/java/org/apache/jena/arq/querybuilder/handlers/DatasetHandler.java
index b353f11..13f6538 100644
--- a/jena-extras/jena-querybuilder/src/main/java/org/apache/jena/arq/querybuilder/handlers/DatasetHandler.java
+++ b/jena-extras/jena-querybuilder/src/main/java/org/apache/jena/arq/querybuilder/handlers/DatasetHandler.java
@@ -100,8 +100,8 @@
      * @see #asGraphName(Object)
      */
     private void processGraphName(Consumer<String> process, Object graphName) {
-        if (graphName instanceof Iterable iterGraphName) {
-            for (Object o : iterGraphName) {
+        if (graphName instanceof Iterable) {
+            for (Object o : (Iterable<?>)graphName) {
                 process.accept(asGraphName(o));
             }
         } else {