Re: [udig-devel] Any recent changes to WorldImageReader?

[Andrea Aime <andrea.aime@xxxxxxxxxxxxx>]

Jesse Eichar ha scritto:
> I've done a bunch of research into this and talked to the author of 
> the plugin.  He tells me that it just randomly fails, something to do 
> with using the FileChannel.  I don't really understand it.  Here's the 
> pertinent lines.
>
>         //preparing the parameteres to read the images using a file 
> channel
>         ParameterBlockJAI readParams = new ParameterBlockJAI("ImageRead",
>                 "rendered");
>
>
> If someone has ideas that'd be great.
Let's try to dig a little deeper. Here we have a constructor that calls 
another constructor:

at javax.media.jai.ParameterBlockJAI.<init>(ParameterBlockJAI.java:208)
   at javax.media.jai.ParameterBlockJAI.<init>(ParameterBlockJAI.java:250)

The ParameterBlockJAI javadoc (at 
javax.media.jai.ParameterBlockJAI.<init>(ParameterBlockJAI.java:208)
   at javax.media.jai.ParameterBlockJAI.<init>(ParameterBlockJAI.java:250)
says that that exception is thrown when one of the two arguments of the 
second constructor is null.
I guess this happens because the "ImageRead" operation cannot be 
converted to and OperationDescription
using the current JAI OperationRegistry.
Since ImageRead is one of the "JAI ImageIO" built-in operations, it 
seems there is some problem in the JAI
ImageIO installation (which is a separate download, it's not JAI itself).

It may also be due a classloading problem. See these messages on 
java.net, for example
http://forums.java.net/jive/thread.jspa?threadID=13500&tstart=0

Sorry, I don't have time to investigate this more in deep.

Cheers
Andrea Aime

> Jesse
>
>
> On 25-Mar-06, at 3:58 AM, Adrian Custer wrote:
>
> > Hey all,
> >
> > code that was working last week now doesn't. Did someone change the code
> > in WorldImageReader recently that would explain this?
> >
> > My code is attached as: GridPtLayerOp.java
> >
> > The three generated files are attached as gridfile.*
> >
> > When the gridfiles are added to a running uDig (e.g. by drag-and-drop),
> > I get an error message in the log that begins:
> >
> >
> > !ENTRY net.refractions.udig.catalog 2 0 2006-03-25 12:48:10.736
> > !MESSAGE !WorldImageGeoResource.error.layer.bounds!
> > !STACK 0
> > java.lang.IllegalArgumentException: The input argument(s) may not be
> > null.
> >     at 
> > javax.media.jai.ParameterBlockJAI.<init>(ParameterBlockJAI.java:208)
> >     at 
> > javax.media.jai.ParameterBlockJAI.<init>(ParameterBlockJAI.java:250)
> >     at
> > org.geotools.gce.image.WorldImageReader.readSourceImage(WorldImageReader.java:464) 
> >
> >     at
> > org.geotools.gce.image.WorldImageReader.read(WorldImageReader.java:301)
> >     at
> > net.refractions.udig.catalog.rasterings.AbstractRasterGeoResource.findResource(Unknown 
> > Source)
> >     at
> > net.refractions.udig.catalog.internal.worldimage.WorldImageGeoResourceImpl$IGeoResourceWorldImageInfo.getBounds(Unknown 
> > Source)
> >     at
> > net.refractions.udig.catalog.internal.worldimage.WorldImageGeoResourceImpl$IGeoResourceWorldImageInfo.<init>(Unknown 
> > Source)
> >     at
> > net.refractions.udig.catalog.internal.worldimage.WorldImageGeoResourceImpl.getInfo(Unknown 
> > Source)
> >     at 
> > net.refractions.udig.catalog.ui.workflow.ConnectionState.run(Unknown
> > Source)
> >
> > Any ideas?
> >
> > thanks,
> > adrian
> >
> >
> > <GridPtLayerOp.java>
> > <gridfile.pgw>
> > <gridfile.png>
> > <gridfile.prj>
> > _______________________________________________
> > User-friendly Desktop Internet GIS (uDig)
> > http://udig.refractions.net
> > http://lists.refractions.net/mailman/listinfo/udig-devel
>
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