7122796: SunToolkit constructor should create the EventQueue for the Main AppContext

Summary: Always create an EQ for the main AppContext in SunToolkit constructor
Reviewed-by: art

src/share/classes/sun/awt/AppContext.java

@@ -342,6 +342,16 @@ public final class AppContext {
         return appContext;
     }
 
+    /**
+     * Returns the main ("system") AppContext.
+     *
+     * @return  the main AppContext
+     * @since   1.8
+     */
+    final static AppContext getMainAppContext() {
+        return mainAppContext;
+    }
+
     private long DISPOSAL_TIMEOUT = 5000;  // Default to 5-second timeout
                                            // for disposal of all Frames
                                            // (we wait for this time twice,

src/share/classes/sun/awt/SunToolkit.java

@@ -101,30 +101,28 @@ public abstract class SunToolkit extends Toolkit
      */
     public final static int MAX_BUTTONS_SUPPORTED = 20;
 
-    public SunToolkit() {
-        Runnable initEQ = new Runnable() {
-            public void run () {
-                EventQueue eventQueue;
+    private static void initEQ(AppContext appContext) {
+        EventQueue eventQueue;
 
-                String eqName = System.getProperty("AWT.EventQueueClass",
-                                                   "java.awt.EventQueue");
+        String eqName = System.getProperty("AWT.EventQueueClass",
+                "java.awt.EventQueue");
 
-                try {
-                    eventQueue = (EventQueue)Class.forName(eqName).newInstance();
-                } catch (Exception e) {
-                    e.printStackTrace();
-                    System.err.println("Failed loading " + eqName + ": " + e);
-                    eventQueue = new EventQueue();
-                }
-                AppContext appContext = AppContext.getAppContext();
-                appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
+        try {
+            eventQueue = (EventQueue)Class.forName(eqName).newInstance();
+        } catch (Exception e) {
+            e.printStackTrace();
+            System.err.println("Failed loading " + eqName + ": " + e);
+            eventQueue = new EventQueue();
+        }
+        appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
 
-                PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
-                appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
-            }
-        };
+        PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
+        appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
+    }
 
-        initEQ.run();
+    public SunToolkit() {
+        // 7122796: Always create an EQ for the main AppContext
+        initEQ(AppContext.getMainAppContext());
     }
 
     public boolean useBufferPerWindow() {
@@ -289,19 +287,7 @@ public abstract class SunToolkit extends Toolkit
         // return correct values
         AppContext appContext = new AppContext(threadGroup);
 
-        EventQueue eventQueue;
-        String eqName = System.getProperty("AWT.EventQueueClass",
-                                           "java.awt.EventQueue");
-        try {
-            eventQueue = (EventQueue)Class.forName(eqName).newInstance();
-        } catch (Exception e) {
-            System.err.println("Failed loading " + eqName + ": " + e);
-            eventQueue = new EventQueue();
-        }
-        appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
-
-        PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
-        appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
+        initEQ(appContext);
 
         return appContext;
     }

test/java/awt/EventQueue/MainAppContext/MainAppContext.java

+/*
+ * @test
+ * @bug 7122796
+ * @summary Tests 7122796
+ * @author anthony.petrov@oracle.com
+ */
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+import sun.awt.*;
+
+public class MainAppContext {
+
+    public static void main(String[] args) {
+        ThreadGroup secondGroup = new ThreadGroup("test");
+        new Thread(secondGroup, new Runnable() {
+                public void run() {
+                    SunToolkit.createNewAppContext();
+                    test(true);
+                }
+            }).start();
+
+        // Sleep on the main thread so that the AWT Toolkit is initialized
+        // in a user AppContext first
+        try { Thread.sleep(2000); } catch (Exception e) {}
+
+        test(false);
+    }
+
+    private static void test(boolean userAppContext) {
+        if (Toolkit.getDefaultToolkit().getSystemEventQueue() == null) {
+            throw new RuntimeException("No EventQueue for the current app context! userAppContext: " + userAppContext);
+        }
+    }
+}