src/share/classes/java/awt/ScrollPane.java

*** 245,255 ****
       * Adds the specified component to this scroll pane container.
       * If the scroll pane has an existing child component, that
       * component is removed and the new one is added.
       * @param comp the component to be added
       * @param constraints  not applicable
!      * @param index position of child component (must be <= 0)
       */
      protected final void addImpl(Component comp, Object constraints, int index) {
          synchronized (getTreeLock()) {
              if (getComponentCount() > 0) {
                  remove(0);
--- 245,255 ----
       * Adds the specified component to this scroll pane container.
       * If the scroll pane has an existing child component, that
       * component is removed and the new one is added.
       * @param comp the component to be added
       * @param constraints  not applicable
!      * @param index position of child component (must be &lt;= 0)
       */
      protected final void addImpl(Component comp, Object constraints, int index) {
          synchronized (getTreeLock()) {
              if (getComponentCount() > 0) {
                  remove(0);