JDK-6583251 : One more ClassCastException in Swing with TrayIcon
  • Type: Bug
  • Component: client-libs
  • Sub-Component: javax.swing
  • Affected Version: 6,7
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic,windows_xp
  • CPU: generic,x86
  • Submitted: 2007-07-20
  • Updated: 2012-10-01
  • Resolved: 2011-05-18
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6u10Fixed 7 b20Fixed
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Before JDK 6 all MouseEvents were generated by subclasses of awt.Component
so it was safe to cast mouseEvent.getSource() to awt.Component,
now it's not the case, because TrayIcon can generate MouseEvents
and TrayIcon doesn't extends awt.Component
so we get ClassCastException from several places

like BasicPopupMenu.MouseGrabber.eventDispatched(AWTEvent ev)

where we do Component src = (Component)ev.getSource();

we should fix it and not cast ev.getSource() without checking

EVALUATION Everything is clear we shouldn't cast mouseEvent.getSource() to Component without checking