Name: rk38400 Date: 05/05/98


Swing 1.0.2, JDK 1.1.6

Tooltips generate a null pointer exception as given below. These
tooltips worked correctly under swing 1.0.0, JDK 1.1.6. Just dragging
the mouse over the various components generates exceptions. Below is
the first exception generated on each platform.

Source code is available upon request. However this seems pretty
generic and should be easy to reproduce without my involved applications.

I even tried the trick of disabling lightweight tool tips as described
in the CHANGES.txt document. This had no effect. I still get
exceptions.

NT:
Exception occurred during event dispatching:
java.lang.NullPointerException
        at com.sun.java.swing.ToolTipManager$JPanelPopup.show(ToolTipManager.java:449)
        at com.sun.java.swing.ToolTipManager.showTipWindow(ToolTipManager.java:169)
        at com.sun.java.swing.ToolTipManager.mouseEntered(ToolTipManager.java:243)
        at java.awt.AWTEventMulticaster.mouseEntered(AWTEventMulticaster.java:246)
        at java.awt.Component.processMouseEvent(Component.java:2293)
        at java.awt.Component.processEvent(Component.java:2129)
        at java.awt.Container.processEvent(Container.java:894)
        at java.awt.Component.dispatchEventImpl(Component.java:1764)
        at java.awt.Container.dispatchEventImpl(Container.java:939)
        at java.awt.Component.dispatchEvent(Component.java:1704)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:1548)
        at java.awt.LightweightDispatcher.setMouseTarget(Container.java:1515)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1392)
        at java.awt.Container.dispatchEventImpl(Container.java:926)
        at java.awt.Component.dispatchEvent(Component.java:1704)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:63)

Solaris:
Exception occurred during event dispatching:
java.lang.NullPointerException
        at com.sun.java.swing.ToolTipManager$JPanelPopup.show(ToolTipManager.java:449)
        at com.sun.java.swing.ToolTipManager.showTipWindow(ToolTipManager.java:169)
        at com.sun.java.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:358)
        at com.sun.java.swing.Timer.fireActionPerformed(Timer.java:134)
        at com.sun.java.swing.Timer$DoPostEvent.run(Timer.java:100)
        at com.sun.java.swing.SystemEventQueueUtilities.processRunnableEvent(SystemEventQueueUtilities.java:193)
        at com.sun.java.swing.SystemEventQueueUtilities.access$0(SystemEventQueueUtilities.java:189)
        at com.sun.java.swing.SystemEventQueueUtilities$RunnableTarget.processEvent(SystemEventQueueUtilities.java:230)
        at java.awt.Component.dispatchEventImpl(Component.java:1781)
        at java.awt.Component.dispatchEvent(Component.java:1708)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:81)
(Review ID: 29704)
======================================================================