Simples Assim

It can’t be realized without custom processors because although several expression languages can retrieve the exception message, neither the XQuery or XSLT components work with fault messages.

WSDL

<wsdl:definitions targetNamespace="http://www.fernandoribeiro.eti.br/ws/sample" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://www.fernandoribeiro.eti.br/ws/sample" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
    <wsdl:types>
        <xs:schema elementFormDefault="qualified" targetNamespace="http://www.fernandoribeiro.eti.br/ws/sample" xmlns:xs="http://www.w3.org/2001/XMLSchema">
            ...
            <xs:element name="SampleFault"> <!-- great opportunity for a common type -->
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="Message" type="xs:string" />
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
        </xs:schema>
    </wsdl:types>
    ...
    <wsdl:message name="SampleFault">
        <wsdl:part name="SampleFault" element="tns:SampleFault" />
    </wsdl:message>
    <wsdl:portType name="SamplePortType">
        <wsdl:operation name="SampleOperation">
            ...
            <wsdl:fault name="SampleFault" message="tns:SampleFault" />
        </wsdl:operation>
    </wsdl:portType>
    <wsdl:binding name="SampleSoapBinding" type="tns:SamplePortType">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http" />
        ...
        <wsdl:operation name="SampleOperation">
            <soap:operation ... />
            ...
            <wsdl:fault name="SampleFault">
                <soap:fault name="SampleFault" use="literal" />
            </wsdl:fault>
        </wsdl:operation>
    </wsdl:binding>
    <wsdl:service name="SampleService">
        <wsdl:port name="SamplePort" binding="tns:SampleSoapBinding">
            <soap:address location="http://ws.fernandoribeiro.eti.br/SampleService/" />
        </wsdl:port>
    </wsdl:service>
</wsdl:definitions>

RouteBuilder

package br.eti.fernandoribeiro.ws.sample;

import org.apache.camel.builder.RouteBuilder;

public final class SampleRouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        onException(Exception.class).process(new SampleFaultProcessor());

        ...
    }

}

Processor

package br.eti.fernandoribeiro.ws.sample;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public final class SampleFaultProcessor implements Processor {
    private static final DocumentBuilderFactory FACTORY = DocumentBuilderFactory.newInstance();

    private DocumentBuilder builder;

    public SampleFaultProcessor() throws ParserConfigurationException {
        builder = FACTORY.newDocumentBuilder();
    }

    public void process(final Exchange exch) throws ParserConfigurationException {
        final Document doc = builder.newDocument();

        final Element root = doc.createElementNS("http://www.fernandoribeiro.eti.br/ws/sample", "SampleFault");

        final Element msg = doc.createElementNS("http://www.fernandoribeiro.eti.br/ws/sample", "Message");

        msg.setTextContent(exch.getException().getMessage());

        root.appendChild(msg);

        doc.appendChild(root);

        exch.getFault().setBody(doc);
    }

}

SOAP Response

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
   <SOAP-ENV:Body>
      <SOAP-ENV:Fault>
         <faultcode>SOAP-ENV:Server</faultcode>
         <faultstring/>
         <detail>
            <SampleFault xmlns="http://www.fernandoribeiro.eti.br/ws/sample">
               <Message>Sample Message</Message>
            </SampleFault>
         </detail>
      </SOAP-ENV:Fault>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>