diff -r 69db488a2bc6 -r d382dacfd73f rt/javap/src/main/java/org/apidesign/javap/Hashtable.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/javap/src/main/java/org/apidesign/javap/Hashtable.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,94 @@
+/**
+ * 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.javap;
+
+/** A JavaScript optimized replacement for Hashtable.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class Hashtable {
+    private Object[] keys;
+    private Object[] values;
+
+    Hashtable(int i) {
+        this();
+    }
+
+    Hashtable(int i, double d) {
+        this();
+    }
+
+    Hashtable() {
+    }
+
+    synchronized void put(Object key, Object val) {
+        int[] where = { -1, -1 };
+        Object found = get(key, where);
+        if (where[0] != -1) {
+            // key exists
+            values[where[0]] = val;
+        } else {
+            if (where[1] != -1) {
+                // null found
+                keys[where[1]] = key;
+                values[where[1]] = val;
+            } else {
+                if (keys == null) {
+                    keys = new Object[11];
+                    values = new Object[11];
+                    keys[0] = key;
+                    values[0] = val;
+                } else {
+                    Object[] newKeys = new Object[keys.length * 2];
+                    Object[] newValues = new Object[values.length * 2];
+                    for (int i = 0; i < keys.length; i++) {
+                        newKeys[i] = keys[i];
+                        newValues[i] = values[i];
+                    }
+                    newKeys[keys.length] = key;
+                    newValues[keys.length] = val;
+                    keys = newKeys;
+                    values = newValues;
+                }
+            }
+        }
+    }
+
+    Object get(Object key) {
+        return get(key, null);
+    }
+    private synchronized Object get(Object key, int[] foundAndNull) {
+        if (keys == null) {
+            return null;
+        }
+        for (int i = 0; i < keys.length; i++) {
+            if (keys[i] == null) {
+                if (foundAndNull != null) {
+                    foundAndNull[1] = i;
+                }
+            } else if (keys[i].equals(key)) {
+                if (foundAndNull != null) {
+                    foundAndNull[0] = i;
+                }
+                return values[i];
+            }
+        }
+        return null;
+    }
+    
+}