Using app engine java image api with eclipse + dev server?

I'm using the image api for google app engine java. I've uploaded an image using my dev server + eclipse, but trying to use any of the image api does not work. This is explained by the exception which is thrown:

Jul 6, 2010 5:28:02 PM com.google.appengine.api.images.dev.LocalImagesService init WARNING: No image reader found for format "ico". An ImageIO plugin must be installed to use this format with the DevAppServer.

Jul 6, 2010 5:28:02 PM 开发者_运维百科com.google.appengine.api.images.dev.LocalImagesService init WARNING: No image reader found for format "tif". An ImageIO plugin must be installed to use this format with the DevAppServer.

is there a plugin we can use locally in the dev server, or is our only option to run it live on app engine to see if it works?

Thanks

You're trying to work with 'ico' and 'tif' images. Neither of these are supported on App Engine - only JPG, PNG and GIF.