XJC fails generating *.java classes

Question

I am trying to generate java classes that describe the web service offered here which belongs to this page. Please mind that I am not convinced that the XML is the one needed to run the following steps!

I save the XML of the API to a file: getcapabilities.xml
I run the following trang command to generate an XSD: java -jar trang.jar getcapabilities.xml getcapabilities.xsd
I get the following files: getcapabilities.xsd, ogc.xsd, wfs.xsd, xlink.xsd, xsi.xsd
I run the following command to generate java classes: xjc getcapabilities.xsd
The following error message is prompted

parsing a schema... [ERROR] no-xsi: The {target namespace} of an attribute declaration must not match 'http://www.w3.org/2001/XMLSchema-instance'.
line 7 of file:xsi.xsd
Failed to parse a schema.

Questions:

Do you get the same error message?
What can I do about it?
Is my approach meant to be successful at all?

score 1 · Accepted Answer · answered Mar 15 '12 at 08:55

1

You're dealing with an OGC Web Feature Service. There's a couple of peculiarities with that.

Don't generate you schemas with trang, you can get them from OGC: http://schemas.opengis.net/wfs/1.1.0/
You don't really have to compile these schemas on your own, you can get them precompiled from the OGC Schemas and Tools project (JARs are here).
WFS schemas only describe WFS operations - they are kind of container schemas. You'll also have an application profile which describes your features. You can obtain it via the DescribeFeatureType operation: http://data.wien.gv.at/daten/wfs?service=WFS&request=DescribeFeatureType&version=1.1.0
Consider using someting like GeoTools.

answered Mar 15 '12 at 08:55

lexicore

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Thank you for the clarification. Could you - with the above asked question in mind - take a look at [another question](http://stackoverflow.com/questions/9237082/how-to-query-a-web-service-via-post-request-in-android) of mine which better describes the project I am trying to implement. I mention [ksoap2-android](http://code.google.com/p/ksoap2-android/) there which is of course not a requirement - just a try of mine. – JJD Mar 15 '12 at 11:13
Finally, I understand better: When I add the schema JARs for the different namespaces like WFS, GML, ... to my project I am able to create objects of those types required in the service definition. – JJD Mar 15 '12 at 18:59
I added the Java code I came up with to my question: [How to query a web service via POST request in Android?](http://stackoverflow.com/questions/9237082/how-to-query-a-web-service-via-post-request-in-android). Though, `JAXBElement` stops me from being successful. – JJD Mar 15 '12 at 20:42
@JJD I think JAXB is not available on Android at all. – lexicore Mar 16 '12 at 08:39
Yes, that's my problem. What would you suggest how I can connect to the WFS from Android? The other question desribes it in detail. – JJD Mar 16 '12 at 11:50

XJC fails generating *.java classes

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