diff -r 5652acd48509 -r d382dacfd73f rt/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,69 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.emul.lang;
+
+import java.lang.reflect.Method;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public class System {
+    private System() {
+    }
+
+    @JavaScriptBody(args = { "value", "srcBegin", "dst", "dstBegin", "count" }, body = 
+        "if (srcBegin < dstBegin) {\n" +
+        "    while (count-- > 0) {\n" +
+        "        dst[dstBegin + count] = value[srcBegin + count];\n" +
+        "    }\n" +
+        "} else {\n" +
+        "    while (count-- > 0) {\n" +
+        "        dst[dstBegin++] = value[srcBegin++];\n" +
+        "    }\n" +
+        "}"
+    )
+    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;"
+    )
+    public static native byte[] expandArray(byte[] arr, int expectedSize);
+
+    @JavaScriptBody(args = {}, body = "return new Date().getTime();")
+    private static native double currentTimeMillisDouble();
+
+    public static long currentTimeMillis() {
+        return (long) currentTimeMillisDouble();
+    }
+
+    public static long nanoTime() {
+        return 1000000L * currentTimeMillis();
+    }
+    @JavaScriptBody(args = { "obj" }, body="return vm.java_lang_Object(false).hashCode__I.call(obj);")
+    public static native int identityHashCode(Object obj);
+}