--- old/src/share/classes/java/util/function/DoubleBlock.java	2012-12-05 09:51:08.586804499 -0800
+++ new/src/share/classes/java/util/function/DoubleBlock.java	2012-12-05 09:51:08.378804487 -0800
@@ -28,12 +28,24 @@
  * An operation upon a {@code double} input value. The operation may modify
  * external state.
  *
- * <p/>This is the primitive type specialization of {@link Block} for
- * {@code double} and also may be used as a {@code Block<Double>}.
+ * <p>This is the primitive type specialization of {@link Block} for
+ * {@code double} and also may be used as a {@code Block<Double>}. When used as
+ * a {@code Block} the default {@code accept} implementation provided by this
+ * interface does not accept null parameters.
  *
  * @since 1.8
  */
-public interface DoubleBlock {
+public interface DoubleBlock extends Block<Double> {
+
+    /**
+     * {@inheritDoc}
+     *
+     * @param t {@inheritDoc}, must be non-null
+     */
+    @Override
+    public default void accept(Double t) {
+        accept((double)t);
+    }
 
     /**
      * Use the {@code double} input value in an operation which may modify