I think you can install JAI and ImageIO into your mac JRE.

Reading the udig documentation it looks like uDig is making do with what 
is included with macosx; remember that uDig is shipping with an old 
version of geotools prior to all of Simone's nice work.

Here are the udig docs:
- 
http://udig.refractions.net/confluence/display/ADMIN/04+Java+Runtime+Environment#04JavaRuntimeEnvironment-MacOSX

I do remember we used to take a liunux download; and stuff the jars 
manually into the macosx JRE; I am under the impression there are 
installers to do it for you now... here is a really old set of 
instructions to that effect.
- http://docs.codehaus.org/display/GEOT/1+Java+Install
- 
http://docs.codehaus.org/display/GEOTOOLS/6+Can+Geotools2+be+used+on+Mac+OS+X

I no several mac osx develoeprs (Jesse, Justin etc...) but so I have not 
managed to get a good set of install instructions out of them; Jesse 
*is* working on a uDig installer that will update your JRE right now; so 
perhaps contacting him and asking to help him test will be the easiest 
approach.

Jody

Gabriella Turek wrote:
> Hello, I've been trying to get my geotools project to compile and run
> on my mac and
> everything seems to work OK except for the when I try to render
> rasters, as there is very limited
> JAI support for the mac (no native library components). Now UDig
> seems to do just fine, so
> there's obviously a workaround.  I am using JMapPane as the basis of
> my code, and that's where
> all the rendering happens. Does that mean I have to dig into that
> code and rework all the JAI calls,
> or is there a quicker workaround?
> Thanx
> gaby
>   


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