Apache CXF client namespace is in element instead of envelope - web-services

Question

The problem I'm having is with Apache CXF putting the namespace inside the element instead of soap envelope.
I used codegen maven plugin to generate the client code from WSDL.
Here are the namespaces in the WSDL:
xmlns:http="http://schemas.xmlsoap.org/wsdl/http/"
xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
When I fire a SOAP request I can see in logs that the following message has been sent:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<ns1:userRegistrationRequest xmlns:ns1="http://some.com/namespace1">
<InputParameter xmlns:ns2="http://some.com/namespace1">
<ns2:Message>
<ns2:Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
<ns2:HashTable>
<ns2:Item key="action">
<ns2:Value>some_action</ns2:Value>
</ns2:Item>
</ns2:HashTable>
</ns2:Message>
</InputParameter>
</ns1:userRegistrationRequest>
</soap:Body>
The problem is that the Value element was null in my code when I constructed the message, but here it appears with XSI namespace.
What I was expecting to get is something like this (Value element should not be present and XSI should be in the envelope element):
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soap:Body>
<ns1:userRegistrationRequest xmlns:ns1="http://some.com/namespace1">
<InputParameter xmlns:ns2="http://some.com/namespace1">
<ns2:Message>
<ns2:HashTable>
<ns2:Item key="action">
<ns2:Value>some_action</ns2:Value>
</ns2:Item>
</ns2:HashTable>
</ns2:Message>
</InputParameter>
</ns1:userRegistrationRequest>
</soap:Body>
Does anyone have an idea how to prevent the CXF from generating that empty Value element and put the namespace inside the soap envelope element?

Answer 1

Ok, so to answer my question. There are two aspects of this problem.
First, adding namespaces to the envelope element. It can be done by writting a custom interceptor and registering it in some early phase. Something like this:
import java.util.Map;
import org.apache.cxf.binding.soap.SoapMessage;
import org.apache.cxf.binding.soap.interceptor.AbstractSoapInterceptor;
import org.apache.cxf.interceptor.Fault;
import org.apache.cxf.phase.Phase;
public class MyInterceptor extends AbstractSoapInterceptor {
private Map<String, String> nsMap;
public MyInterceptor(Map<String, String> nsMap) {
super(Phase.USER_LOGICAL);
this.nsMap = nsMap;
}
public void handleMessage(SoapMessage message) throws Fault {
message.put("soap.env.ns.map", nsMap);
message.put("disable.outputstream.optimization", Boolean.TRUE);
}
}
I found the above solution here
Secondly, to remove empty value element an xsd should be changed to that the element has minOccurs="0" and nillable = "false".