src/java.desktop/share/classes/javax/swing/JPanel.java

@@ -178,10 +178,21 @@
                 ui.installUI(this);
             }
         }
     }
 
+    /**
+     * Only for Linux System, try to sync repaint method to correct for the
+     * moment bug JDK-8178091. The bug is only on Linux ,so in other os it uses
+     * asyncrone repaint()
+     */
+    public void repaint() {
+        super.repaint();
+        if (System.getProperty("os.name").equals("Linux")) {
+            Toolkit.getDefaultToolkit().sync();
+        }
+    }
 
     /**
      * Returns a string representation of this JPanel. This method
      * is intended to be used only for debugging purposes, and the
      * content and format of the returned string may vary between