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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