--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/lang/IllegalMonitorStateException.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 1995, 2008, 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 a thread has attempted to wait on an
+ * object's monitor or to notify other threads waiting on an object's
+ * monitor without owning the specified monitor.
+ *
+ * @author  unascribed
+ * @see     java.lang.Object#notify()
+ * @see     java.lang.Object#notifyAll()
+ * @see     java.lang.Object#wait()
+ * @see     java.lang.Object#wait(long)
+ * @see     java.lang.Object#wait(long, int)
+ * @since   1.0
+ */
+public
+class IllegalMonitorStateException extends RuntimeException {
+    private static final long serialVersionUID = 3713306369498869069L;
+
+    /**
+     * Constructs an <code>IllegalMonitorStateException</code> with no
+     * detail message.
+     */
+    public IllegalMonitorStateException() {
+        super();
+    }
+
+    /**
+     * Constructs an <code>IllegalMonitorStateException</code> with the
+     * specified detail message.
+     *
+     * @param   s   the detail message.
+     */
+    public IllegalMonitorStateException(String s) {
+        super(s);
+    }
+}