[Bug AWT/19845] New: Swing ToolTipManager and getLocationOnScreen

["hendrich at informatik dot uni-hamburg dot de" <gcc-bugzilla at gcc dot gnu dot org>]

javax.swing.ToolTipManager causes (eternal) NullPointerExceptions
when JToolTips are enabled on non-showing JComponents, e.g. on
not-yet-shown dialog windows or just-closed dialog windows.

If the bug happens, Swing is unusable, because the main GUI thread
never recovers from the NPEs. ToolTipManager should probably ignore
non-showing components and should be more robust...
I have no small testcase, but a typical stack trace looks like this:

Exception during event dispatch:
java.awt.IllegalComponentStateException: component not showing
   at java.awt.Component.getLocationOnScreen() (/opt/gcc40/lib/libgcj.so.6.0.0)
   at javax.swing.SwingUtilities.convertPointFromScreen(java.awt.Point,
java.awt.Component) (/opt/gcc40/lib/libgcj.so.6.0.0)
   at javax.swing.SwingUtilities.convertPoint(java.awt.Component, int, int,
java.awt.Component) (/opt/gcc40/lib/libgcj.so.6.0.0)
   at javax.swing.SwingUtilities.convertPoint(java.awt.Component,
java.awt.Point, java.awt.Component) (/opt/gcc40/lib/libgcj.so.6.0.0)
   at
javax.swing.ToolTipManager.getContentPaneDeepestComponent(java.awt.event.MouseEvent)
(/opt/gcc40/lib/libgcj.so.6.0.0)
   at javax.swing.ToolTipManager.mouseExited(java.awt.event.MouseEvent)
(/opt/gcc40/lib/libgcj.so.6.0.0)

-- 
           Summary: Swing ToolTipManager and getLocationOnScreen
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: AWT
        AssignedTo: fitzsim at redhat dot com
        ReportedBy: hendrich at informatik dot uni-hamburg dot de
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19845