jdk/src/share/classes/java/awt/Component.java

*** 7273,7283 ****
                              throw new IllegalArgumentException("focus traversal keys must be unique for a Component");
                          }
                      }
                  }
              }
- 
              oldKeys = focusTraversalKeys[id];
              focusTraversalKeys[id] = (keystrokes != null)
                  ? Collections.unmodifiableSet(new HashSet<AWTKeyStroke>(keystrokes))
                  : null;
          }
--- 7273,7282 ----
*** 7285,7294 ****
--- 7284,7294 ----
          firePropertyChange(focusTraversalKeyPropertyNames[id], oldKeys,
                             keystrokes);
      }
      final Set<AWTKeyStroke> getFocusTraversalKeys_NoIDCheck(int id) {
          // Okay to return Set directly because it is an unmodifiable view
+         @SuppressWarnings("unchecked")
          Set<AWTKeyStroke> keystrokes = (focusTraversalKeys != null)
              ? focusTraversalKeys[id]
              : null;
  
          if (keystrokes != null) {