215061 - Java applet which utilizes threads behaves erratically

Status: RESOLVED EXPIRED

(Core Graveyard :: Java: OJI, defect)

Description

[Peter Schmandra]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5a) Gecko/20030728 Mozilla Firebird/0.6.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5a) Gecko/20030728 Mozilla Firebird/0.6.1

I'm not sure if this is a bug or my programming, but the same applet rips using
the Micro $oft virtual machine.

Basically, a thread in the main applet waits for all the label threads to die
before it enables the "Generate" button. This prevents people from clicking the
button like a mad man.

Solved it by simply enabling the "Generate" button from the label thread when
it's finished and doing away with the thread in the main applet. It works but
this method is not very elegant.

BTW - I never managed to get bmp's to show up. I don't want to file a bug just
to have a hundred people jump on my head just because it's a licensing issue or
something. BMP's work fine with M$.




Reproducible: Always

Steps to Reproduce:
1. Load the applet
2. Press the "Generate Super Happy Luck Lotto Numbers"

Actual Results:  
Numbers tumble in an erratic fashion.

Expected Results:  
Numbers should tumble smoothly

Comment 1

[Olivier Cahagne]

please mention JRE used.
Using Mozilla 2003080105 on Linux + Sun's JRE 1.4.2, applet never finishes
loading and Java Console shows:

java.lang.NullPointerException
	at sun.plugin.viewer.LifeCycleManager.startAppletPanel(Unknown Source)
	at sun.plugin.viewer.MNetscapePluginObject.startPlugin(Unknown Source)
	at sun.plugin.viewer.MNetscapePluginObject$Initer.run(Unknown Source)
java.lang.ClassFormatError: NPDS/npDSEvtObsProxy (Truncated class file)
	at java.lang.ClassLoader.defineClass0(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at sun.applet.AppletClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.applet.AppletClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.applet.AppletClassLoader.loadCode(Unknown Source)
	at sun.applet.AppletPanel.createApplet(Unknown Source)
	at sun.plugin.AppletViewer.createApplet(Unknown Source)
	at sun.applet.AppletPanel.runLoader(Unknown Source)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

Comment 2

[Peter Schmandra]

I'm using Sun Microsystems JVM 1.4.1_01 with firebird but I can't find a java
console on this browser. The applet manages to load fine but it behaves
erratically when the numbers tumble.

When I load it using the MS JVM, no exceptions are showing up in the IE java
console and it works great.

Comment 3

[Peter Schmandra]

I just Loaded the applet in MS Explorer using Sun's plugin and got this
exception thrown.

java.lang.NullPointerException
	at sun.java2d.pipe.DrawImage.copyImage(Unknown Source)
	at sun.java2d.pipe.DrawImage.copyImage(Unknown Source)
	at sun.java2d.pipe.ValidatePipe.copyImage(Unknown Source)
	at sun.java2d.SunGraphics2D.drawImage(Unknown Source)
	at sun.java2d.SunGraphics2D.drawImage(Unknown Source)
	at CLlabel.paint(CLlabel.java)
	at sun.awt.RepaintArea.paint(Unknown Source)
	at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

Comment 4

[Peter Schmandra]

There is a NullPointerException in the Applet that for some reason MS JVM fails
to throw. Looks like this is a bug in MS JVM not Sun's. 

Comment 5

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
are asking for your help in focussing our efforts. If you can still reproduce
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If it is not a problem any longer, you need take no action. If this bug is not
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Comment 6

[Gervase Markham [:gerv]]

This bug has been automatically resolved after a period of inactivity (see above
comment). If anyone thinks this is incorrect, they should feel free to reopen it.