diff -r 000000000000 -r 9984d9a62bc0 rt/emul/compact/src/main/java/java/util/concurrent/Unsafe.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/emul/compact/src/main/java/java/util/concurrent/Unsafe.java	Sat Mar 19 13:15:11 2016 +0100
@@ -0,0 +1,77 @@
+/*
+ * 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.util.concurrent;
+
+import java.lang.reflect.Field;
+
+final class Unsafe {
+    static Unsafe getUnsafe() {
+        throw new SecurityException();
+    }
+
+    void throwException(Throwable exception) {
+        throw new SecurityException();
+    }
+
+    void putOrderedObject(Object q, long u, ForkJoinTask<?> t) {
+        throw new SecurityException();
+    }
+
+    boolean compareAndSwapObject(Object q, long l, Object t, Object object) {
+        throw new SecurityException();
+    }
+
+    Object getObjectVolatile(Object oldQ, long u) {
+        throw new SecurityException();
+    }
+
+    void putObjectVolatile(Object q, long l, Object t) {
+        throw new SecurityException();
+    }
+
+    long arrayBaseOffset(Class a) {
+        throw new SecurityException();
+    }
+
+    int arrayIndexScale(Class a) {
+        throw new SecurityException();
+    }
+
+    boolean compareAndSwapLong(Object aThis, long ctlOffset, long c, long nc) {
+        throw new SecurityException();
+    }
+
+    void unpark(ForkJoinWorkerThread w) {
+        throw new SecurityException();
+    }
+
+    boolean compareAndSwapInt(Object aThis, long blockedCountOffset, int b, int i) {
+        throw new SecurityException();
+    }
+
+    long objectFieldOffset(Field declaredField) {
+        throw new SecurityException();
+    }
+
+}