one problem with SimplePlayerApplet.java (JMF sample code)

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taowang.gml@gmail.com - 13 Feb 2007 22:54 GMT

OS: Win XP PRO
Java: jdk/jre 1.6.0, JMF 2.1.1e
Web Browser: IE 6.0 and Firefox 1.5.0.9

source code: Java Media Framework (JMF) 2.1 - Sample Code.
http://java.sun.com/products/java-media/jmf/2.1.1/samples/samples/SimplePlayerAp
plet.java

html file (Note: you may change java_sound.wav to other audio/video
files):
<html>
<applet code=SimplePlayerApplet width=320 height=300>
<param name=file value="java_sound.wav">
</applet>
</html>

Problem description
This applet runs well in IE or Firefox. However, when I click the
Refresh button rapidly (as fast as I can), the Java Console

prints out the following message in most cases:
java.lang.NullPointerException
    at sun.plugin.AppletViewer.loadJarFiles(Unknown Source)
    at sun.applet.AppletPanel.runLoader(Unknown Source)
    at sun.applet.AppletPanel.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

>From time to time, it prints out

java.lang.NullPointerException
    at sun.plugin.AppletViewer.loadJarFiles(Unknown Source)
    at sun.applet.AppletPanel.runLoader(Unknown Source)
    at sun.applet.AppletPanel.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at sun.plugin.viewer.WNetscapePluginObject$1.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown
Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(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)

This problem is quite weird to me bacause SimplePlayerApplet.java is
Sample Code of JMF.
Any ideas about how to fix that?
Thanks in advance!

Tao Wang

Reply to this Message

Andrew Thompson - 14 Feb 2007 07:30 GMT

On Feb 14, 9:54 am, taowang....@gmail.com wrote:

> Any ideas about how to fix that?

Sure! But I already gave them here..
<http://forum.java.sun.com/thread.jspa?messageID=9498025>

Andrew T.

Reply to this Message

one problem with SimplePlayerApplet.java (JMF sample code)

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