diff -r a2924470187b -r 05224402145d emul/mini/src/main/java/java/lang/NumberFormatException.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emul/mini/src/main/java/java/lang/NumberFormatException.java	Wed Jan 23 20:39:23 2013 +0100
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 1994, 2001, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.lang;
+
+/**
+ * Thrown to indicate that the application has attempted to convert
+ * a string to one of the numeric types, but that the string does not
+ * have the appropriate format.
+ *
+ * @author  unascribed
+ * @see     java.lang.Integer#toString()
+ * @since   JDK1.0
+ */
+public
+class NumberFormatException extends IllegalArgumentException {
+    static final long serialVersionUID = -2848938806368998894L;
+
+    /**
+     * Constructs a <code>NumberFormatException</code> with no detail message.
+     */
+    public NumberFormatException () {
+        super();
+    }
+
+    /**
+     * Constructs a <code>NumberFormatException</code> with the
+     * specified detail message.
+     *
+     * @param   s   the detail message.
+     */
+    public NumberFormatException (String s) {
+        super (s);
+    }
+
+    /**
+     * Factory method for making a <code>NumberFormatException</code>
+     * given the specified input which caused the error.
+     *
+     * @param   s   the input causing the error
+     */
+    static NumberFormatException forInputString(String s) {
+        return new NumberFormatException("For input string: \"" + s + "\"");
+    }
+}