The message `org.locationtech.jts.geom.MultiPolygon incompatible with
com.vividsolutions.jts.geom.Geometry` - suggests that you have two
incompatible versions of JTS in your build.
Ian
On Tue, 2 May 2023 at 17:39, Mieke Zwart <mieke.zw...@assetpeople.com>
wrote:
> Hello list,
>
>
>
> Unfortunately, I have to use an old version of Geotools, as my client is
> reliant on software that is build in java 8 and cannot upgrade. I think the
> latest version of Geotools that was working with java 8 is 20.5.
>
> Now I have the following problem and have not been able to find a solution
> in the last week, searching various forums and this mailing list.
>
> I have a WKT (or Geometry or SimpleFeature) and need to convert it to GML
> (to submit into a WFS insert transaction).
>
> I have tried using the encoder in different ways:
>
> - Feeding it either a SimpleFeature, Geometry derived from
> SimpleFeature or Geometry derived from WKT.
> - Using GML._Geometry, GML.MultiPolygon or various other QNames to
> encode the feature/geometry.
>
> I get depending on the above, a variety of errors:
>
> If I try to encode a Geometry I usually get the error that gid property is
> missing:
>
> Exception in thread "main" *java.lang.RuntimeException*: Failed to get
> property: gid
>
> at org.geotools.xml.impl.GetPropertyExecutor.visit(
> *GetPropertyExecutor.java:105*)
>
> at org.geotools.xml.impl.BindingWalker$BindingExecutionChain.execute(
> *BindingWalker.java:220*)
>
> at org.geotools.xml.impl.BindingWalker.walk(*BindingWalker.java:186*
> )
>
> at org.geotools.xml.impl.BindingVisitorDispatch.walk(
> *BindingVisitorDispatch.java:47*)
>
> at org.geotools.xml.impl.BindingVisitorDispatch.walk(
> *BindingVisitorDispatch.java:32*)
>
> at org.geotools.xml.Encoder.encode(*Encoder.java:883*)
>
> at org.geotools.xml.Encoder.encode(*Encoder.java:584*)
>
> at org.geotools.tutorial.App.main(App.java)
>
> Caused by: *java.lang.ClassCastException*:
> org.locationtech.jts.geom.MultiPolygon incompatible with
> com.vividsolutions.jts.geom.Geometry
>
> at
> org.geotools.gml3.bindings.AbstractGeometryTypeBinding.getProperty(
> *AbstractGeometryTypeBinding.java:129*)
>
> at org.geotools.xml.impl.GetPropertyExecutor.visit(
> *GetPropertyExecutor.java:103*)
>
> ... 7 more
>
>
>
> Code:
>
> String woPolygonWKT = "MULTIPOLYGON (((4 0, 2 2, 4 4, 6 2, 4 0)), ((2 1,
> 1.9807852804032304 0.8049096779838718, 1.9238795325112867
> 0.6173165676349102, 1.8314696123025453 0.4444297669803978,
> 1.7071067811865475 0.2928932188134525, 1.5555702330196022
> 0.1685303876974548, 1.3826834323650898 0.0761204674887133,
> 1.1950903220161284 0.0192147195967696, 1 0, 0.8049096779838718
> 0.0192147195967696, 0.6173165676349103 0.0761204674887133,
> 0.444429766980398 0.1685303876974547, 0.2928932188134525
> 0.2928932188134524, 0.1685303876974547 0.4444297669803978,
> 0.0761204674887132 0.6173165676349106, 0.0192147195967695
> 0.8049096779838723, 0 1.0000000000000007, 0.0192147195967698
> 1.1950903220161293, 0.0761204674887137 1.382683432365091,
> 0.1685303876974555 1.5555702330196035, 0.2928932188134536
> 1.7071067811865488, 0.4444297669803993 1.8314696123025462,
> 0.6173165676349122 1.9238795325112874, 0.8049096779838739
> 1.9807852804032309, 1.0000000000000024 2, 1.1950903220161309
> 1.98078528040323, 1.3826834323650925 1.9238795325112856, 1.5555702330196048
> 1.8314696123025436, 1.70710678118655 1.7071067811865452, 1.8314696123025471
> 1.5555702330195993, 1.9238795325112883 1.3826834323650863,
> 1.9807852804032313 1.1950903220161244, 2 1)))";
>
> WKTReader wktR = *new* WKTReader();
>
> Geometry geom2;
>
> *try* {
>
> geom2 = wktR.read(woPolygonWKT);
>
> System.*out*.println(geom2.toString());
>
> //geom2.setSRID(4326);
>
> org.geotools.xml.Configuration configuration = *new*
> org.geotools.gml3.GMLConfiguration();
>
> org.geotools.xml.Encoder encoder = *new*
> org.geotools.xml.Encoder( configuration );
>
> ByteArrayOutputStream out = *new* ByteArrayOutputStream();
>
>
>
> *try* {
>
> System.*out*.println("trying to encode");
>
> encoder.encode(geom2, org.geotools.gml3.GML.
> *MultiPolygon*,out);
>
> } *catch* (IOException e) {
>
> // *TODO* Auto-generated catch block
>
> e.printStackTrace();
>
> }
>
> System.*out*.println(out.toString());
>
> } *catch* (ParseException e1) {
>
> // *TODO* Auto-generated catch block
>
> e1.printStackTrace();
>
> }
>
>
>
> I have also tried:
> *public* String convertSimpleFeatureToGML(SimpleFeature
> simpleFeature) {
>
> GMLConfiguration gmlConfiguration = *new* GMLConfiguration(
> *true*);
>
> Geometry geom = (Geometry) simpleFeature.getDefaultGeometry();
>
>
>
> Encoder encoder = *new* Encoder(gmlConfiguration);
>
> ByteArrayOutputStream boas = *new* ByteArrayOutputStream();
>
> *try* {
>
> encoder.encode(geom, GML.*MultiPolygon*, boas);
>
> *return* boas.toString();
>
> } *catch* (IOException e) {
>
> e.printStackTrace();
>
> *return* "";
>
> }
>
>
>
> }
>
> And then calling this function with a simpleFeature that contains the
> multipolygon described above in the WKT.
>
>
>
> If anyone can help me, it would be greatly appreciated.
>
>
>
> Kind Regards / Met vriendelijke groet,
>
> *Asset People B.V.*
>
>
>
> *Mieke Zwart*
>
>
>
> M. +31 (0) 612 967 788
>
> E. mieke.zw...@assetpeople.com
>
>
> _______________________________________________
> GeoTools-GT2-Users mailing list
> GeoTools-GT2-Users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
>
--
Ian Turton
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