36934 - Java applets throw exceptions on closing.

Status: VERIFIED DUPLICATE of bug 31220

(Core Graveyard :: Java: OJI, defect, P3)

Description

[Dmitri_Latushko]

Try to run any java applet from JDK, by opening
approriate demo page from JDK, for instance, 
  C:\jdk1.2.2\demo\applets\Clock\example1.html 
When you close the window with the example1.html,
the applet throws a couple of NullPointerExceptions
from within an awt event handling routine.

Any subsequent attempts to open the example1.html file
and to run the applet will fail, the applet will be not
displayed on the page and you will only see the new 
NullPointerExceptions in java console.

This is the output grabbed from Java Console:
---------------------------------------------

Java(TM) Plug-in: Version stanleyh

Using JRE version 1.3.0rc1 Java HotSpot(TM) Client VM
User home directory = C:\WINNT\Profiles\dvlatush
Proxy Configuration: Browser Proxy Configuration

JAR cache enabled.

java.lang.NullPointerException: null pData
	at sun.awt.windows.WComponentPeer.hide(Native Method)
	at java.awt.Component.hide(Unknown Source)
	at java.awt.Window.hide(Unknown Source)
	at java.awt.Component.show(Unknown Source)
	at java.awt.Component.setVisible(Unknown Source)
	at sun.plugin.navig.win32.PluginObject.setWindow(PluginObject.java:201)
java.lang.NullPointerException: null pData
	at sun.awt.windows.WComponentPeer.hide(Native Method)
	at java.awt.Component.hide(Unknown Source)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception occurred during event dispatching:
java.lang.NullPointerException: component argument pData
	at sun.awt.windows.WGraphics.createFromComponent(Native Method)
	at sun.awt.windows.WGraphics.<init>(Unknown Source)
	at sun.awt.windows.WComponentPeer.getGraphics(Unknown Source)
	at java.awt.Component.getGraphics(Unknown Source)
	at sun.awt.RepaintArea.update(Unknown Source)
	at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

Comment 1

[Dmitri_Latushko]

It's a critical bug. Applets work unstable due to this bug.

Comment 2

[rpallath]

Can u specify Which build of Mozilla you are using.

Comment 3

[Gervase Markham [:gerv]]

As there is no Java support in Mozilla currently, this is either a 4.x bug, or a 
NS 6 PR 1 bug. Marking nsonly for NS engineers to decide what to do with it.

Gerv

Comment 4

[Dmitri_Latushko]

The bug is reported for Netscape 6 Preview Release 1:
  Mozilla/5.0 (Windows; N; WinNT4.0; en-US; m14) Netscape6/6.0b1
There's no problems with NN 4.x

Comment 5

[shrirang khanzode]

dup of 31220. 

*** This bug has been marked as a duplicate of 31220 ***

Comment 6

[shrirang khanzode]

verif