File jna-getpeer.patch of Package libjnidispatch

--- jna-4.5.0/contrib/platform/src/com/sun/jna/platform/WindowUtils.java	2017-09-13 22:12:57.000000000 +0200
+++ jna-4.5.0/contrib/platform/src/com/sun/jna/platform/WindowUtils.java	2017-09-19 16:46:13.777724232 +0200
@@ -1389,11 +1389,13 @@
             whenDisplayable(w, new Runnable() {
 				@Override
                 public void run() {
-                    Object peer = w.getPeer();
                     try {
-                        Class<?> cls = peer.getClass();
-                        Method m = cls.getMethod("setAlpha", new Class[]{ float.class });
-                        m.invoke(peer, Float.valueOf(alpha));
+                        // This will work with old Apple AWT implementations and
+                        // not with openjdk
+                        Method getPeer = w.getClass().getMethod("getPeer");
+                        Object peer = getPeer.invoke(w);
+                        Method setAlpha = peer.getClass().getMethod("setAlpha", new Class[]{ float.class });
+                        setAlpha.invoke(peer, Float.valueOf(alpha));
                     }
                     catch (Exception e) {
                     }