src/java.desktop/share/classes/javax/swing/JComponent.java

*** 616,625 ****
--- 616,626 ----
       * Returns the look and feel delegate that renders this component.
       *
       * @return the {@code ComponentUI} object that renders this component
       * @since 1.9
       */
+     @Transient
      public ComponentUI getUI() {
          return ui;
      }
  
      /**