René Estrella ha scritto:
> I'm trying to deploy an ascii raster format map with geotools 2.3.0.  I'm
> using the following code:
> 
>       ArcGridReader agr = new ArcGridReader(raster);
>         GridCoverage2D gc2 = (GridCoverage2D)agr.read(null);
> 
> where 'raster' is an URL object containing the URL of the ascii raster.
> 
> When I run my class, I get the following exception:
...
> Caused by: java.lang.NullPointerException
>         at
> com.sun.media.imageioimpl.common.ImageUtil.getJDKImageReaderWriterSPI
> (ImageUtil.java:1366)
>         at
> com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageReaderSpi.onRegis

Ah, that's probably GEOT-1134 
(http://jira.codehaus.org/browse/GEOT-1134). I guess on Windows you did 
not install JAI and JAI
image i/o in your jdk and jre, but have them in the classpath instead?
The stack trace I was getting when that issue appeared was exactly the
same.

It has been fixed in 2.3.x branch, which will be released as 2.3.1
(maybe in a couple of weeks?). You can try and download a recent nightly
  here: http://www.geo-solutions.it/gt2_nightly/

Let me know if this fixes your problem.

Cheers
Andrea

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