one problem with SimplePlayerApplet.java (JMF sample code)

Discussion in 'Java' started by taowang.gml@gmail.com, Feb 13, 2007.

  1. Guest

    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/SimplePlayerApplet.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
     
    , Feb 13, 2007
    #1
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  2. On Feb 14, 9:54 am, 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.
     
    Andrew Thompson, Feb 14, 2007
    #2
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