src/share/classes/javax/swing/plaf/metal/MetalBumps.java

*** 65,74 ****
--- 65,75 ----
      }
  
      private static BumpBuffer createBuffer(GraphicsConfiguration gc,
                                             Color topColor, Color shadowColor, Color backColor) {
          AppContext context = AppContext.getAppContext();
+         @SuppressWarnings("unchecked")
          List<BumpBuffer> buffers = (List<BumpBuffer>) context.get(METAL_BUMPS);
          if (buffers == null) {
              buffers = new ArrayList<BumpBuffer>();
              context.put(METAL_BUMPS, buffers);
          }