--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jaxws/src/jdk.xml.bind/share/classes/com/sun/istack/internal/tools/MaskingClassLoader.java	Sun Aug 17 15:52:15 2014 +0100
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 1997, 2013, 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 com.sun.istack.internal.tools;
+
+import java.util.Collection;
+
+/**
+ * {@link ClassLoader} that masks a specified set of classes
+ * from its parent class loader.
+ *
+ * <p>
+ * This code is used to create an isolated environment.
+ *
+ * @author Kohsuke Kawaguchi
+ */
+public class MaskingClassLoader extends ClassLoader {
+
+    private final String[] masks;
+
+    public MaskingClassLoader(String... masks) {
+        this.masks = masks;
+    }
+
+    public MaskingClassLoader(Collection<String> masks) {
+        this(masks.toArray(new String[masks.size()]));
+    }
+
+    public MaskingClassLoader(ClassLoader parent, String... masks) {
+        super(parent);
+        this.masks = masks;
+    }
+
+    public MaskingClassLoader(ClassLoader parent, Collection<String> masks) {
+        this(parent, masks.toArray(new String[masks.size()]));
+    }
+
+    @Override
+    protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        for (String mask : masks) {
+            if(name.startsWith(mask))
+                throw new ClassNotFoundException();
+        }
+
+        return super.loadClass(name, resolve);
+    }
+}