--- old/src/share/classes/java/lang/StringBuilder.java	2009-02-06 18:03:26.000000000 +0100
+++ new/src/share/classes/java/lang/StringBuilder.java	2009-02-06 18:03:26.000000000 +0100
@@ -400,6 +400,36 @@
         return this;
     }
 
+    /**
+     * @throws NullPointerException {@inheritDoc}
+     * @since 1.7
+     */
+    @Override
+    public StringBuilder join(String delimiter, Object first, Object... elements) {
+        super.join(delimiter, first, elements);
+        return this;
+    }
+    
+    /**
+     * @throws NullPointerException {@inheritDoc}
+     * @since 1.7
+     */
+    @Override
+    public StringBuilder join(String delimiter, Object[] elements) {
+        super.join(delimiter, elements);
+        return this;
+    }
+    
+    /**
+     * @throws NullPointerException {@inheritDoc}
+     * @since 1.7
+     */
+    @Override
+    public StringBuilder join(String delimiter, Iterable<?> elements) {
+        super.join(delimiter, elements);
+        return this;
+    } 
+    
     public String toString() {
         // Create a copy, don't share the array
         return new String(value, 0, count);