diff -r f2f6b61d34ac -r 25638687fe82 jdk/src/share/classes/java/util/Vector.java
--- a/jdk/src/share/classes/java/util/Vector.java	Tue Oct 19 09:49:08 2010 -0700
+++ b/jdk/src/share/classes/java/util/Vector.java	Tue Oct 19 10:02:25 2010 -0700
@@ -222,8 +222,10 @@
      * @param minCapacity the desired minimum capacity
      */
     public synchronized void ensureCapacity(int minCapacity) {
-        modCount++;
-        ensureCapacityHelper(minCapacity);
+        if (minCapacity > 0) {
+            modCount++;
+            ensureCapacityHelper(minCapacity);
+        }
     }
 
     /**