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

*** 70,79 ****
--- 70,82 ----
  
  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;
  
*** 892,902 ****
      }
  
      private synchronized void lazilyInitWProps() {
          if (wprops == null) {
              wprops = new WDesktopProperties(this);
!             updateProperties();
          }
      }
  
      /*
       * Called from lazilyLoadDesktopProperty because Windows doesn't
--- 895,905 ----
      }
  
      private synchronized void lazilyInitWProps() {
          if (wprops == null) {
              wprops = new WDesktopProperties(this);
!             updateProperties(wprops.getProperties());
          }
      }
  
      /*
       * Called from lazilyLoadDesktopProperty because Windows doesn't
*** 927,960 ****
       * 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() {
          EventQueue.invokeLater(new Runnable() {
              @Override
              public void run() {
!                 updateProperties();
              }
          });
      }
  
!     private synchronized void updateProperties() {
!         if (null == wprops) {
!             // wprops has not been initialized, so we have nothing to update
              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);
          }
      }
  
      @Override
      public synchronized void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
          if (name == null) {
              // See JavaDoc for the Toolkit.addPropertyChangeListener() method
              return;
--- 930,977 ----
       * 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();
+         updateXPStyleEnabled(props.get(XPSTYLE_THEME_ACTIVE));
+ 
          EventQueue.invokeLater(new Runnable() {
              @Override
              public void run() {
!                 updateProperties(props);
              }
          });
      }
  
!     private synchronized void updateProperties(final Map<String, Object> props) {
!         if (null == props) {
              return;
          }
  
!         updateXPStyleEnabled(props.get(XPSTYLE_THEME_ACTIVE));
! 
          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 Map<String, Object> getWProps() {
+         return (wprops != null) ? wprops.getProperties() : null;
+     }
+ 
+     private void updateXPStyleEnabled(final Object dskProp) {
+         ThemeReader.xpStyleEnabled = Boolean.TRUE.equals(dskProp);
+     }
+ 
      @Override
      public synchronized void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
          if (name == null) {
              // See JavaDoc for the Toolkit.addPropertyChangeListener() method
              return;