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<mailto:mieke.zw...@assetpeople.com>
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