onShutdown is no longer available when using JPMS, so it was removed. The developer will now have to implement shutdown hooks for SWT/JavaFX

src/dorkbox/javaFx/JavaFx.java

@@ -145,9 +145,4 @@ class JavaFx {
     boolean isEventThread() {
         return JavaFxAccess.isEventThread();
     }
-
-    public static
-    void onShutdown(final Runnable runnable) {
-        JavaFxAccess.onShutdown(runnable);
-    }
 }

src/dorkbox/javaFx/JavaFxAccess.java

@@ -17,8 +17,6 @@ package dorkbox.javaFx;
 
 /**
  * Utility methods for JavaFX.
- * <p>
- * We use reflection for these methods so that we can compile everything under a version of Java that might not have JavaFX.
  */
 public
 class JavaFxAccess {
@@ -32,9 +30,4 @@ class JavaFxAccess {
         // JAVA 8
         return com.sun.javafx.tk.Toolkit.getToolkit().isFxUserThread();
     }
-
-    public static
-    void onShutdown(final Runnable runnable) {
-        com.sun.javafx.tk.Toolkit.getToolkit().addShutdownHook(runnable);
-    }
 }

src/dorkbox/swt/Swt.java

@@ -79,9 +79,4 @@ class Swt {
     boolean isEventThread() {
         return SwtAccess.isEventThread();
     }
-
-    public static
-    void onShutdown(final Runnable runnable) {
-        SwtAccess.onShutdown(runnable);
-    }
 }

src/dorkbox/swt/SwtAccess.java

@@ -119,20 +119,4 @@ class SwtAccess {
     boolean isEventThread() {
         return Thread.currentThread() == currentDisplayThread;
     }
-
-    static
-    void onShutdown(final Runnable runnable) {
-        // currentDisplay.getShells() must only be called inside the event thread!
-        if (isEventThread()) {
-            SwtAccess.onShutdown(currentDisplay, runnable);
-        } else {
-            dispatch(new Runnable() {
-                @Override
-                public
-                void run() {
-                    SwtAccess.onShutdown(currentDisplay, runnable);
-                }
-            });
-        }
-    }
 }

src9/dorkbox/javaFx/JavaFxAccess.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2016 dorkbox, llc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package dorkbox.javaFx;
+
+/**
+ * Utility methods for JavaFX.
+ */
+public
+class JavaFxAccess {
+    static
+    void dispatch(final Runnable runnable) {
+        javafx.application.Platform.runLater(runnable);
+    }
+
+    static
+    boolean isEventThread() {
+        // JAVA 9+
+        return javafx.application.Platform.isFxApplicationThread();
+    }
+}

src9/dorkbox/swt/EmptyClass.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2021 dorkbox, llc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dorkbox.swt;
+
+/**
+ * Required for intellij to not complain regarding `module-info` for a multi-release jar.
+ * This file is completely ignored by the gradle build process
+ */
+public
+class EmptyClass {}