src/windows/classes/sun/awt/windows/WToolkit.java

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@@ -70,10 +70,15 @@
 
 public final class WToolkit extends SunToolkit implements Runnable {
 
     private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.windows.WToolkit");
 
+    /**
+     * Desktop property which specifies whether XP visual styles are in effect.
+     */
+    public static final String XPSTYLE_THEME_ACTIVE = "win.xpstyle.themeActive";
+
     static GraphicsConfiguration config;
 
     // System clipboard.
     WClipboard clipboard;
 

@@ -927,34 +932,52 @@
      * Called from native toolkit code when WM_SETTINGCHANGE message received
      * Also called from lazilyLoadDynamicLayoutSupportedProperty because
      * Windows doesn't always send WM_SETTINGCHANGE when it should.
      */
     private void windowsSettingChange() {
+        // JDK-8039383: Have to update the value of XPSTYLE_THEME_ACTIVE property
+        // as soon as possible to prevent NPE and other errors because theme data
+        // has become unavailable.
+        final Map<String, Object> props = getWProps();
+        if (props != null) {
+            Object xpstyleOld = getDesktopProperty(XPSTYLE_THEME_ACTIVE);
+            Object xpstyleNew = props.get(XPSTYLE_THEME_ACTIVE);
+            if (xpstyleOld != null && !xpstyleOld.equals(xpstyleNew)) {
+                setDesktopProperty(XPSTYLE_THEME_ACTIVE, xpstyleNew);
+            }
+
         EventQueue.invokeLater(new Runnable() {
             @Override
             public void run() {
-                updateProperties();
+                    updateProperties(props);
             }
         });
     }
+    }
 
-    private synchronized void updateProperties() {
-        if (null == wprops) {
-            // wprops has not been initialized, so we have nothing to update
+    private synchronized void updateProperties(final Map<String, Object> props) {
+        if (null == props) {
             return;
         }
 
-        Map<String, Object> props = wprops.getProperties();
         for (String propName : props.keySet()) {
             Object val = props.get(propName);
             if (log.isLoggable(PlatformLogger.Level.FINER)) {
                 log.finer("changed " + propName + " to " + val);
             }
             setDesktopProperty(propName, val);
         }
     }
 
+    private synchronized void updateProperties() {
+        updateProperties(getWProps());
+    }
+
+    private synchronized Map<String, Object> getWProps() {
+        return wprops != null ? wprops.getProperties() : null;
+    }
+
     @Override
     public synchronized void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
         if (name == null) {
             // See JavaDoc for the Toolkit.addPropertyChangeListener() method
             return;