This is a programming error, look at my comments
Quoting ballibum <[email protected]>:
> 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;
// big_geom is null here
> 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);
// first iteration, big_geom is still null, big_geom.union(the_geom) causes
// the NullPointerException, the following will work
//
// if (big_geom==null)
// big_geom=the_geom
// else
// 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)
>
>
> --
> View this message in context:
> http://osgeo-org.1803224.n2.nabble.com/difference-between-layer-a-and-layer-b-tp6358222p6358322.html
> Sent from the geotools-gt2-users mailing list archive at Nabble.com.
>
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Achieve unprecedented app performance and reliability
What every C/C++ and Fortran developer should know.
Learn how Intel has extended the reach of its next-generation tools
to help boost performance applications - inlcuding clusters.
http://p.sf.net/sfu/intel-dev2devmay
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