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    <p>This is a verified bug. I have sent Oracle information on their sample code failing using the default install of JDK 1.7.0 or JRE7. Using the source code below compiled into TranslucentWindow.java, it fails and produces the exception initially indicated above.</p> <p>From web page <a href="http://download.oracle.com/javase/tutorial/uiswing/misc/trans_shaped_windows.html#uniform" rel="nofollow">Oracle's Translucency / Shaped Windows Page</a></p> <pre><code>// Taken from http://download.oracle.com/javase/tutorial/uiswing/misc/trans_shaped_windows.html#uniform import java.awt.*; import javax.swing.*; import static java.awt.GraphicsDevice.WindowTranslucency.*; public class TranslucentWindow extends JFrame { public TranslucentWindow() { super("TranslucentWindow"); setLayout(new GridBagLayout()); setSize(300,200); setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add a sample button. add(new JButton("I am a Button")); } public static void main(String[] args) { // Determine if the GraphicsDevice supports translucency. GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice gd = ge.getDefaultScreenDevice(); //If translucent windows aren't supported, exit. if (!gd.isWindowTranslucencySupported(TRANSLUCENT)) { System.err.println("Translucency is not supported"); System.exit(0); } // Create the GUI on the event-dispatching thread SwingUtilities.invokeLater(new Runnable() { @Override public void run() { TranslucentWindow tw = new TranslucentWindow(); // Set the window to 55% opaque (45% translucent). tw.setOpacity(0.55f); // Display the window. tw.setVisible(true); } }); } </code></pre> <p>}</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is decorated at java.awt.Frame.setOpacity(Frame.java:960) at TranslucentWindow$1.run(TranslucentWindow.java:38) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705) at java.awt.EventQueue.access$000(EventQueue.java:101) at java.awt.EventQueue$3.run(EventQueue.java:666) at java.awt.EventQueue$3.run(EventQueue.java:664) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:675) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105) at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) </code></pre>
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    1. POIs The Java Tutorials Translucent Window example giving trouble to those playing with jdk7?
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    1. USRick Hodgin
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    1. COWhere is the bug report so others can see it? I have noticed that with jre6 I get this exception "sometimes" and other times it shows the full JFrame translucent (as his "should be" example does). http://www.iteye.com/topic/1113045 seems to imply it is a "bug" in jdk6 that it was allowed, as also http://stackoverflow.com/questions/4631021/how-to-set-transparent-background-of-jdialog
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    2. COIt wasn't an official bug report in their bug reporting system, but an email to the documentation page maintainers about that page having errant code. I never heard back from them, but the email went to 'javasedocs_us@oracle.com'.
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    3. COThere's no official bug report, and yet you call it a *verified* bug??
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      1. USb1nary.atr0phy
 

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