Re: [Geotools-gt2-users] difference between layer a and layer b

[ballibum <bal...@we...>]

Thanks for answering,
i've tested your idea, but it does not work.
That is my code:


	public static Geometry big_geom (SimpleFeatureCollection featureCollection)
	{
		Geometry big_geom = null;
		FeatureIterator iterator_polygone = featureCollection.features();
		try
		{
			while(iterator_polygone.hasNext())
			{
				SimpleFeature feature_polygon = (SimpleFeature)
iterator_polygone.next();
				Geometry the_geom = (Geometry) feature_polygon.getDefaultGeometry();
				big_geom = big_geom.union(the_geom);
			}
		}
		finally
		{
			featureCollection.close( iterator_polygone );
		}
		return big_geom;
	}

I got the following error:


Exception in thread "main" java.lang.NullPointerException
	at main.funktionen.big_geom(funktionen.java:165)
	at main.funktionen.Flaeche(funktionen.java:130)
	at main.start.main(start.java:48)


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