Hi Krishna; you need to be sure to include the needed jars for gml support.
Looks like you want WFS1_0 support?
You may also need to write out the xml schema file for your collection first?
Remember that GML is not an actual format; instead it is a recipe for how to
make your own XML format in a consistent manner.
There are some docs here:
- http://docs.codehaus.org/display/GEOTDOC/13+XML#13XML-GML2Encoding
I included a complete parsing example; but do not see a complete encoding
example; but even so it shows you the two steps required.
I have tried to make it easier with that GML utility class; but I don't think I
have managed it yet.
Behind the scenes it is doing:
- http://docs.codehaus.org/display/GEOTDOC/05+GTXML+Parsing+and+Encoding
For background on what jars are involved in working with GML see this page:
- http://docs.geotools.org/latest/userguide/guide/welcome/geotools.html
--
Jody Garnett
On Friday, 4 March 2011 at 3:25 AM, Krishna Rajendra Alapati wrote:
> Hi All,
>
> I am new to Geotools and trying to create a GML from a simple feature
> collection. I am using the following code
>
> OutputStream out = new FileOutputStream(new File("C:\\test.gml"));
> GML gml = new GML(Version.WFS1_0);
> gml.encode(out, collection);
> gml.setNamespace("test", "http://test.com";);
>
> out.close();
>
>
> But it's throwing NullPointerException
>
> Exception in thread "main" java.lang.NullPointerException
> at
> org.xml.sax.helpers.NamespaceSupport.declarePrefix(NamespaceSupport.java:289)
> at org.geotools.GML.encode(GML.java:297)
>
> Please help me to getrid of this error.
>
> Thank you,
> Krishna.
>
>
>
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