Re: [Geotools-gt2-users] Geometry or WKT or SimpleFeature encode to GML in GeoTools 20.5

[Taavi I. <ta...@ea...>]

Hi

Found information about JDK support here:
https://docs.geotools.org/latest/userguide/build/install/jdk.html

"Java 8 - GeoTools 15.x up to and including GeoTools 28.x (OpenJDK and
Oracle JRE tested)"

So you could try to upgrade to GeoTools 28.x with Java 8. I've
upgraded from 22.x quite recently with not too big application and
there were roadblocks with few versions, so I suggest going one major
release at the time. I also noticed that even minor versions could
behave differently. I really depends on your application.

Cheers,
Taavi

On Tue, May 2, 2023 at 7:38 PM Mieke Zwart <mie...@as...> 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. mie...@as...
>
>
>
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