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
