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FULL PRODUCT VERSION : JRE 1.6.0 Update 20 ADDITIONAL OS VERSION INFORMATION : Microsoft Windows XP [Version 5.1.2600] EXTRA RELEVANT SYSTEM CONFIGURATION : JRE 1.6.0 Update 20 Internet Explorer 7 A DESCRIPTION OF THE PROBLEM : We have an applet that requires Drag N Drop within itself. So we have a bunch of panels and we need to drag and drop child panels from one panel to another. The Drag N Drop used to work perfectly till 1.6.0 Update 18 but since Update 19 its broken. I have updated to the latest version which seems to be update 20 and it's still broken. The following is a simple stack trace of the exception in the Java Console when running the applet in Internet Explorer 7:- Exception in thread "AWT-EventQueue-2" java.security.AccessControlException: access denied (java.awt.AWTPermission accessClipboard) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkSystemClipboardAccess(Unknown Source) at sun.awt.dnd.SunDropTargetContextPeer.getTransferData(Unknown Source) at sun.awt.datatransfer.TransferableProxy.getTransferData(Unknown Source) at java.awt.dnd.DropTargetContext$TransferableProxy.getTransferData(Unknown Source) While tracking the changes to the SunDropTargetContextPeer.java it was noticed that the following code was added on Mon Mar 01 07:17:27 2010 -0800 as a result of 6887703: Unsigned applet can retrieve the dragged information before drop action occur SecurityManager sm = System.getSecurityManager(); try { if (!dropComplete && sm != null) { sm.checkSystemClipboardAccess(); } } catch (Exception e) { Thread currentThread = Thread.currentThread(); currentThread.getUncaughtExceptionHandler().uncaughtException(currentThread, e); return null; } However, since we are simply utilizing the drag n drop within the applet, we do not want to access the system clipboard and thus do not want to sign our applet. Please address the issue as its a generic problem where the java demo's utilizing drag n drop are broken as well. e.g. Similar exception is thrown when utilizing Drag N Drop in http://java.sun.com/docs/books/tutorial/uiswing/dnd/textpaste.html STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : Please test the Drag N Drop functionality on http://java.sun.com/docs/books/tutorial/uiswing/dnd/textpaste.html in both 1.6.0 Update 18 and 1.6.0 Update 19 to see the exception. Its still broken in 1.6.0 Update 20. EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - No Exceptions should be thrown when utilizing Drag N Drop ACTUAL - NullPointerException as detailed above due to security check. REPRODUCIBILITY : This bug can be reproduced always. ---------- BEGIN SOURCE ---------- Please look at the demo at http://java.sun.com/docs/books/tutorial/uiswing/dnd/textpaste.html ---------- END SOURCE ---------- CUSTOMER SUBMITTED WORKAROUND : I have modified the Control Panel > Java to utilize 1.6.0 update 18 but we cannot ask our customers to do that.