Still having problems playing MP3s on Mac OS 10.5

Hi everyone,
I was never able to solve this issue, and moved on to other things, but I'm stumbling over it again. I believe that I have everything set up properly; I put the jmf and mp3 plugin jars in my /Library/Java/Extensions folder, but I am getting this message when I try running java com.sun.media.codec.audio.mp3.JavaDecoder:
java.lang.reflect.InvocationTargetException
Registered succesfully
So does that mean it's properly registered, or is that InvocationTargetException something tats causing a problem. The JMF works fine for everything but mp3s; when I try playing an MP3 file, I get this error:
Unable to handle format: mpeglayer3, 44100.0 Hz, 16-bit, Stereo, LittleEndian, Signed, 16000.0 frame rate, FrameSize=32768 bits
Failed to realize: com.sun.media.PlaybackEngine@39b3a2
Error: Unable to realize com.sun.media.PlaybackEngine@39b3a2
All of the files I've tested worked fine with the JMStudio application that came with the JMF, but when I compiled JMStudio on my system, I got the same results that I describe above.
I've installed, uninstalled, and reinstalled the JMF and the mp3 plugin a couple times now, and then have run the jmfinit binary, and then the jmfregistry binary, and then added and committed the com.sun.media.codec.audio.mp3.JavaDecoder to the Plugins->Codec menu. Again, with the results that I have described above.
Can anyone help?

I have had some success adding the [JMF codec|http://java.sun.com/javase/technologies/desktop/media/jmf/mp3/download.html] to the run-time classpath of the application (or applet).
I did not 'install' any version of the JMF to this Ubuntu system, but separately downloaded the (MP3 codec) Jar and just added it to the classpath (at run-time).
Note there are a number of MP3s that the JMF codec fails to get an input stream from. I recommend anybody attempting this, try it first with an MP3 that has been seen to work using the JMF codec. As such you might..
a) Visit this applet(1), which tries to load/play an MP3. And if that works OK on your Mac., then go to..
b) Visit the [sound section of my media page|http://pscode.org/media/#sound] and download the 'Dead End' MP3 for your own local testing.
(1) The applet Jars are digitally signed. You can safely refuse the digitally signed code and the applet should still work. The applet is still experimental - if you have any problems with it, I would appreciate hearing them. Part a) is effectively an 'acid test' on whether my attempts to play MP3s in applets for Mac users (and other visitors) is successful. If it fails, it might indicate a difference in the way Macs implement the SPI.

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