Error using IMAGE/IO in a Servlet

I'm trying to read a .tiff on the back end of my server. I do:

[...]

FileImageInputStream fis = new FileImageInputStream(new File(p_tifName));

Object o = ImageIO.getImageReadersByFormatName(

"tiff").next();

TIFFImageReader reader = (TIFFImageReader)o;

reader.setInput(fis);

[...]

If I run this code in the Servlet via a main() it works fine. But when running in Dev Mode, I get the error:

java.lang.ClassCastException: com.sun.media.imageioimpl.plugins.tiff.TIFFImageReader cannot be cast to com.sun.media.imageioimpl.plugins.tiff.TIFFImageReader

I have the imageIO.jar on the class path. Everything seems happy, except in Dev mode. Does anyone have any ideas? I'm at a loss at how to get around an error saying a class can't be casted to itself. 

-Sean

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