Java Web Start application run on Java SE 8 b79 shows "trust level" SecurityExceptions intermittently. Once the issue occurs, the error message is repeated: 2013-03-06 13:47:44,203 ERROR [AWT-EventQueue-0] [X.XX.XXX.XXXX.DefaultExceptionHandler] Uncaught Exception: class "X.XX.XXX.XXXX.CannedTreePopup$CannedResponsesDialog$1" does not match trust level of other classes in the same package java.lang.SecurityException: class "X.XX.XXX.XXXX.CannedTreePopup$CannedResponsesDialog$1" does not match trust level of other classes in the same package at com.sun.deploy.security.CPCallbackHandler$ChildElement.checkResource(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$JarLoader.checkResource(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$JarLoader.getResource(Unknown Source) at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source) at java.net.URLClassLoader$1.run(URLClassLoader.java:357) at java.net.URLClassLoader$1.run(URLClassLoader.java:354) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:353) at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(ClassLoader.java:423) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) at X.XX.XXX.XXXX.CannedTreePopup$CannedResponsesDialog.<init>(CannedTreePopup.java:1037) at X.XX.XXX.XXXX.CannedTreePopup.show(CannedTreePopup.java:623) at X.XX.XXX.XXXX.CannedPopupAction.actionPerformed(CannedPopupAction.java:31) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877) at java.awt.Component.processMouseEvent(Component.java:6513) at javax.swing.JComponent.processMouseEvent(JComponent.java:3322) at java.awt.Component.processEvent(Component.java:6278) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4869) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4691) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4856) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4516) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4446) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2721) at java.awt.Component.dispatchEvent(Component.java:4691) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:722) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:681) at java.awt.EventQueue$3.run(EventQueue.java:679) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:695) at java.awt.EventQueue$4.run(EventQueue.java:693) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:692) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:216) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:135) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:123) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:119) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:111) at java.awt.EventDispatchThread.run(EventDispatchThread.java:97) At this point the application is broken. Menu item 'File->Exit' does not longer respond. Likewise, other GUI functions do no longer respond.
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