--- old/src/java.desktop/share/classes/javax/swing/event/EventListenerList.java 2017-10-26 15:30:21.000000000 -0700 +++ new/src/java.desktop/share/classes/javax/swing/event/EventListenerList.java 2017-10-26 15:30:21.000000000 -0700 @@ -1,5 +1,5 @@ /* - * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 1997, 2017, 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 @@ -102,7 +102,7 @@ /* A null array to be shared by all empty listener lists*/ private static final Object[] NULL_ARRAY = new Object[0]; /** The list of ListenerType - Listener pairs */ - protected transient Object[] listenerList = NULL_ARRAY; + protected volatile transient Object[] listenerList = NULL_ARRAY; /** * Passes back the event listener list as an array