src/share/classes/javax/swing/plaf/basic/BasicScrollBarUI.java

@@ -1263,11 +1263,12 @@
             if (scrollbar.getParent() instanceof JScrollPane) {
                 JScrollPane scrollpane = (JScrollPane)scrollbar.getParent();
                 JViewport viewport = scrollpane.getViewport();
                 Component view = viewport.getView();
                 if (view instanceof JList) {
-                    JList list = (JList)view;
+                    @SuppressWarnings("unchecked")
+                    JList<Object> list = (JList)view;
                     if (DefaultLookup.getBoolean(list, list.getUI(),
                                                  "List.lockToPositionOnScroll", false)) {
                         int adjustedValue = value;
                         int mode = list.getLayoutOrientation();
                         int orientation = scrollbar.getOrientation();