diff -r c668c83507ee -r 0d277415ed02 emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java
--- a/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Wed Feb 06 15:19:59 2013 +0100
+++ b/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Thu Feb 07 12:58:12 2013 +0100
@@ -17,6 +17,7 @@
  */
 package org.apidesign.bck2brwsr.emul.lang;
 
+import java.lang.reflect.Method;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
 
 /**
@@ -38,7 +39,15 @@
         "    }\n" +
         "}"
     )
-    public static native void arraycopy(Object value, int srcBegin, Object dst, int dstBegin, int count);
+    public static void arraycopy(Object src, int srcBegin, Object dst, int dstBegin, int count) {
+        try {
+            Class<?> system = Class.forName("java.lang.System");
+            Method m = system.getMethod("arraycopy", Object.class, int.class, Object.class, int.class, int.class);
+            m.invoke(null, src, srcBegin, dst, dstBegin, count);
+        } catch (Exception ex) {
+            throw new IllegalStateException(ex);
+        }
+    }
 
     @JavaScriptBody(args = { "arr", "expectedSize" }, body = 
         "while (expectedSize-- > arr.length) { arr.push(0); }; return arr;"