diff -r 09d10795f55c -r e8db9f297016 samples/composition/src-api2.0/api/Arithmetica.java
--- a/samples/composition/src-api2.0/api/Arithmetica.java	Sat Jun 14 10:01:34 2008 +0200
+++ b/samples/composition/src-api2.0/api/Arithmetica.java	Sat Jun 14 10:01:36 2008 +0200
@@ -12,6 +12,9 @@
     }
     
     public int sumAll(int... numbers) {
+        if (numbers.length == 0) {
+            return 0;
+        }
         int sum = numbers[0];
         for (int i = 1; i < numbers.length; i++) {
             sum = sumTwo(sum, numbers[i]);