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Duplicate :
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FULL PRODUCT VERSION :
java version " 1.7.0_15 "
Java(TM) SE Runtime Environment (build 1.7.0_15-b03)
Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)
ADDITIONAL OS VERSION INFORMATION :
Darwin dimitrys-mac-mini.local 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64
A DESCRIPTION OF THE PROBLEM :
calls of ComponentgetMousePosition() for applets running in any browser like firefox are interrupted by ClassCast Exception with trace
java.lang.ClassCastException: sun.lwawt.macosx.CPlatformEmbeddedFrame cannot be cast to sun.lwawt.macosx.CPlatformWindow
at sun.lwawt.macosx.CMouseInfoPeer.isWindowUnderMouse(CMouseInfoPeer.java:45)
at java.awt.Component.findUnderMouseInWindow(Component.java:1325)
at java.awt.Component.getMousePosition(Component.java:1377)
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Open the following html page embedding the applet in a Web Browser using java plug-in and click on button " click me "
<html><body>
<object classid= " java:JAppletExample.class "
codetype= " application/java-vm " width= " 800 " height= " 200 " >
</object>
</body></html>
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
button text should be changed to " clicked " ,
no exception should be thrown
ACTUAL -
ClassCastException is thrown,
the text on the button is " sun.lwawt.macosx.CPlatformEmbeddedFrame cannot be cast to sun.lwawt.macosx.CPlatformWindow " ,
Exception trace appears on the java console
ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.ClassCastException: sun.lwawt.macosx.CPlatformEmbeddedFrame cannot be cast to sun.lwawt.macosx.CPlatformWindow
at sun.lwawt.macosx.CMouseInfoPeer.isWindowUnderMouse(CMouseInfoPeer.java:45)
at java.awt.Component.findUnderMouseInWindow(Component.java:1325)
at java.awt.Component.getMousePosition(Component.java:1377)
at JAppletExample$1.actionPerformed(JAppletExample.java:18)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
// java
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class JAppletExample extends JApplet {
public void init() {
Container content = getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
final JButton button = new JButton( " Click me " );
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
button.getMousePosition();
button.setText( " Clicked " );
}
catch (Exception e1) {
button.setText(e1.getMessage());
e1.printStackTrace();
}
}
});
content.add(button);
}
}
---------- END SOURCE ----------