> 
> Both look very strange... can you reproduce them into a standalone
> program, provide the shapefiles and let us have a look?
> 
> Cheers
> Andrea

I found out what is the problem :
renderer.paint((Graphics2D) ig, mapRectangle, new Envelope(0,0,50,50));

it's the "Envelope(0,0,50,50)"

the 0 looks to be a problem, but this kind of envelope could happen.

the error :
ATTENTION: Determinant is 0
java.awt.geom.NoninvertibleTransformException: Determinant is 0
        at 
java.awt.geom.AffineTransform.createInverse(AffineTransform.java:2680)
        at 
org.geotools.renderer.lite.RendererUtilities.worldToScreenTransform(RendererUtilities.java:145)
        at 
org.geotools.renderer.shape.ShapefileRenderer.paint(ShapefileRenderer.java:266)
        at 
org.geotools.renderer.shape.ShapefileRenderer.paint(ShapefileRenderer.java:1479)
        at 
org.geotools.gui.swing.map.map2d.strategy.SingleBufferedImageStrategy.createBufferImage(SingleBufferedImageStrategy.java:265)
        at 
org.geotools.gui.swing.map.map2d.strategy.SingleBufferedImageStrategy$DrawingThread.run(SingleBufferedImageStrategy.java:422)
20 févr. 2008 11:53:45 org.geotools.renderer.lite.RendererUtilities 
worldToScreenTransform

The second error is harder to reproduce, but i'll try to find a way.

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