src/java.desktop/unix/classes/sun/awt/X11/XToolkit.java

*** 344,357 ****
              AwtScreenData defaultScreen = new AwtScreenData(XToolkit.getDefaultScreenData());
              awt_defaultFg = defaultScreen.get_blackpixel();
  
              arrowCursor = XlibWrapper.XCreateFontCursor(XToolkit.getDisplay(),
                  XCursorFontConstants.XC_arrow);
!             areExtraMouseButtonsEnabled = Boolean.parseBoolean(System.getProperty("sun.awt.enableExtraMouseButtons", "true"));
              //set system property if not yet assigned
!             System.setProperty("sun.awt.enableExtraMouseButtons", ""+areExtraMouseButtonsEnabled);
! 
              // Detect display mode changes
              XlibWrapper.XSelectInput(XToolkit.getDisplay(), XToolkit.getDefaultRootWindow(), XConstants.StructureNotifyMask);
              XToolkit.addEventDispatcher(XToolkit.getDefaultRootWindow(), new XEventDispatcher() {
                  @Override
                  public void dispatchEvent(XEvent ev) {
--- 344,361 ----
              AwtScreenData defaultScreen = new AwtScreenData(XToolkit.getDefaultScreenData());
              awt_defaultFg = defaultScreen.get_blackpixel();
  
              arrowCursor = XlibWrapper.XCreateFontCursor(XToolkit.getDisplay(),
                  XCursorFontConstants.XC_arrow);
!             final String extraButtons = "sun.awt.enableExtraMouseButtons";
!             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
!                 areExtraMouseButtonsEnabled =
!                     Boolean.parseBoolean(System.getProperty(extraButtons, "true"));
                  //set system property if not yet assigned
!                 System.setProperty(extraButtons, ""+areExtraMouseButtonsEnabled);
!                 return null;
!             });
              // Detect display mode changes
              XlibWrapper.XSelectInput(XToolkit.getDisplay(), XToolkit.getDefaultRootWindow(), XConstants.StructureNotifyMask);
              XToolkit.addEventDispatcher(XToolkit.getDefaultRootWindow(), new XEventDispatcher() {
                  @Override
                  public void dispatchEvent(XEvent ev) {