Detecting a truncated JPEG file

I'm building a simple applet to display a JPEG file. Often times the file will be truncated. That is, the applet will read the file while it is being updated. When this happens, a partial JPEG displays. I would like to detect this situation, wait a little bit, then reload the image from the server.
I have defined an imageUpdate method for the applet in hopes that an ImageObserver.ERROR flag would be passed in when the incomplete JPEG is read. This does not happen. Instead, when the applet is terminated, the message "Premature end of JPEG file" is output to the Java Console. I cannot detect what is outputting this note.
I'm working with JDK1.1 to maintain browser compatibility and would prefer to not have to parse the JPEG file myself. Any ideas on something I should try next?
Jason
[email protected]

I have also setup a MediaTracker for the image, then used the various error checking methods to check for error. Nothing is reported in error.

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===================
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