CXF

CXF Component

The cxf: component provides integration with Apache CXF for connecting to JAX-WS services hosted in CXF.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
   <groupId>org.apache.camel</groupId>
   <artifactId>camel-cxf</artifactId>
   <version>x.x.x</version>  <!-- use the same version as your Camel core version -->
</dependency>

URI format

cxf://address?options

Where address represents the CXF endpoint's address

cxf:bean:cxfEndpoint

Where cxfEndpoint represents the spring bean's name which presents the CXF endpoint

For either style above, you can append options to the URI as follows:

cxf:bean:cxfEndpoint?wsdlURL=wsdl/hello_world.wsdl&dataFormat=PAYLOAD

Options

The serviceName and portName are QNames, so if you provide them be sure to prefix them with their {namespace} as shown in the examples above.

NOTE From CAMEL 1.5.1 , the serviceClass for CXF producer (i.e. the "to" endpoint) should be Java interface.

The descriptions of the dataformats

You can determine the data format mode of an exchange by retrieving the exchange property CamelCXFDataFormat. The exchange key constant is defined in org.apache.camel.component.cxf.CxfConstants.DATA_FORMAT_PROPERTY.

Description of relayHeaders option

There are "in-band" and "out-of-band" on the wire headers from a perspective of a JAXWS WSDL-first developer.

The "in-band" headers are headers that are explicitly defined as part of the WSDL binding contract for an endpoint such as SOAP headers.

The "out-of-band" headers are headers that are serialized over the wire but are not explicitly part of the WSDL binding contract.

Headers relaying/dropping is bi-directional.

When a route has a CXF endpoint and the developer needs to have on the wire headers such as SOAP headers be relayed along the route to be consumed say by another JAXWS endpoint then relayHeaders should be set to true, which is the default value.

The relayHeaders = true express an intent to relay the headers. The actual decision on whether a given header is relayed is delegated to a pluggable instance that implements MessageHeadersRelay interface. An concrete implementation MessageHeadersRelay will be consulted to decide if a header needs to be relayed or not. There is already an implementation of SoapMessageHeadersRelay which binds itself to well known SOAP name spaces. Currently only "out-of-band" headers are filtered, and "in-band" headers will always be relayed when relayHeaders = true. If there is a header on the wire, whose name space is unknown to the runtime, then a fall back DefaultMessageHeadersRelay will be used, which simply allows all headers to be relayed.

The relayHeaders = false asserts that all headers "in-band" and "out-of-band" will be dropped.

You can plugin your own MessageHeadersRelay implementations overriding or adding additional ones to the list of relays. In order to override a preloaded relay instance just make sure that your MessageHeadersRelay implementation services the same name spaces as the one you looking to override. Also note, that the overriding relay has to service all of the name spaces as the one you looking to override, or else a runtime exception on route start up will be thrown as this would introduce an ambiguity in name spaces to relay instance mappings.

<cxf:cxfEndpoint ...>
  <cxf:properties>
    <entry key="org.apache.camel.cxf.message.headers.relays">
      <list>
        <ref bean="customHeadersRelay"/>
      </list>
    </entry>
  </cxf:properties>
</cxf:cxfEndpoint>

<bean id="customHeadersRelay" class="org.apache.camel.component.cxf.soap.headers.CustomHeadersRelay"/>

Take a look at the tests that show how you'd be able to relay/drop headers here:

https://svn.apache.org/repos/asf/camel/branches/camel-1.x/components/camel-cxf/src/test/java/org/apache/camel/component/cxf/soap/headers/CxfMessageHeadersRelayTest.java

Configure the CXF endpoints with spring

You can configure the CXF endpoint with the below spring configuration file, and you can also embed the endpoint into the camelContext tags.

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:cxf="http://activemq.apache.org/camel/schema/cxfEndpoint"

       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://activemq.apache.org/camel/schema/cxfEndpoint http://activemq.apache.org/camel/schema/cxf/camel-cxf-1.6.0.xsd
       http://activemq.apache.org/camel/schema/spring http://activemq.apache.org/camel/schema/spring/camel-spring.xsd
    ">

   <cxf:cxfEndpoint id="routerEndpoint" address="http://localhost:9003/CamelContext/RouterPort"
    		serviceClass="org.apache.hello_world_soap_http.GreeterImpl"/>

   <cxf:cxfEndpoint id="serviceEndpoint" address="http://localhost:9000/SoapContext/SoapPort"
    		wsdlURL="testutils/hello_world.wsdl"
    		serviceClass="org.apache.hello_world_soap_http.Greeter"
    		endpointName="s:SoapPort"
    		serviceName="s:SOAPService"
    	xmlns:s="http://apache.org/hello_world_soap_http" />

   <camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
    <route>
      <from uri="cxf:bean:routerEndpoint" />
      <to uri="cxf:bean:serviceEndpoint" />
    </route>
   </camelContext>

</beans>

NOTE In Camel 2.x we change to use "http://camel.apache.org/schema/cxf" as the cxfendpont's target namespace.

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:cxf="http://camel.apache.org/schema/cxf"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf-2.0.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
    ">
...

Be sure to include the JAX-WS schemaLocation attribute specified on the root beans element. This allows CXF to validate the file and is required. Also note the namespace declarations at the end of the <cxf:cxfEndpoint/> tag--these are required because the combined "{namespace}localName" syntax is presently not supported for this tag's attribute values.

The cxf:cxfEndpoint element supports many additional attributes:

It also supports many child elements:

You can find more advanced examples which show how to provide interceptors , properties and handlers here:
http://cwiki.apache.org/CXF20DOC/jax-ws-configuration.html

NOTE
You can use cxf:properties to set the camel-cxf endpoint's dataFormat and setDefaultBus properties from spring configuration file.

<cxf:cxfEndpoint id="testEndpoint" address="http://localhost:9000/router"
    serviceClass="org.apache.camel.component.cxf.HelloService"
    endpointName="s:PortName"
    serviceName="s:ServiceName"
    xmlns:s="http://www.example.com/test">
    <cxf:properties>
      <entry key="dataFormat" value="MESSAGE"/>
      <entry key="setDefaultBus" value="true"/>
    </cxf:properties>
  </cxf:cxfEndpoint>

How to let camel-cxf component to use log4j instead of java.util.logging

CXF's default logger is using java.util.logging, if you want to change it to log4j.
Here is the instruction: Create a file, in the classpath, named META-INF/cxf/org.apache.cxf.logger.This file should contain the fully-qualified name of the class (org.apache.cxf.common.logging.Log4jLogger), with no comments, on a single line.

How to consume the message from the camel-cxf endpoint in POJO data format

The camel-cxf endpoint consumer POJO data format is based on the cxf invoker, so the message header has a property with the name of CxfConstants.OPERATION_NAME and the message body is a list of the SEI method parameters.

How to prepare the message for the camel-cxf endpoint in POJO data format

The camel-cxf endpoint producer is based on the cxf client API. First you need to specify the operation name in the message header , then add the method parameters into a list and set the message with this parameter list will be ok. The response message's body is a messageContentsList, you can get the result from that list.

NOTE After Camel 1.5 , we change the message body from object array to message content list. If you still want to get the object array from the message body, you can get the body with this code message.getbody(Object[].class)

How to deal with the message for the camel-cxf endpoint in PAYLOAD data format

PAYLOAD means you will get or set the payload message which has been take out the SOAP envelope from or into the CXF message. You can use the Header.HEADER_LIST as the key to set or get the SOAP headers and use the List<Element> to set or get SOAP body elements.

Change in 2.0, CxfMessage.getBody() will return a org.apache.camel.component.cxf.CxfPayload object, which has getters for SOAP message headers and Body elements.  This change enables decoupling the native CXF message from the Camel message. 

How to throw the SOAP Fault from Camel

If you are using the camel-cxf endpoint to consume the SOAP request, you may need to throw the SOAP Fault from the camel context.
Basically, you can use the throwFault DSL to do that, it works for POJO, PAYLOAD and MESSAGE data format.
You can define the soap fault like this

Then throw it as you like

If your cxf endpoint working in the MESSAGE data format, you could set the the SOAP Fault message into the message body and set the response code in the message header.

NOTE the response code setting only works in Camel's version >= 1.5.1

How to propagate camel-cxf endpoint's request and response context

cxf client API provides a way to invoke the operation with request and response context. If you are using camel-cxf endpoint producer to invoke the outside web service, you can set the request context and get response context with below codes.

CxfExchange exchange = (CxfExchange)template.send(getJaxwsEndpointUri(), new Processor() {
            public void process(final Exchange exchange) {
                final List<String> params = new ArrayList<String>();
                params.add(TEST_MESSAGE);
                // Set the request context to the inMessage
                Map<String, Object> requestContext = new HashMap<String, Object>();
                requestContext.put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY, JAXWS_SERVER_ADDRESS);
                exchange.getIn().setBody(params);
                exchange.getIn().setHeader(Client.REQUEST_CONTEXT , requestContext);
                exchange.getIn().setHeader(CxfConstants.OPERATION_NAME, GREET_ME_OPERATION);
            }
        });
        org.apache.camel.Message out = exchange.getOut();
        // The output is an object array, the first element of the array is the return value
        Object[] output = out.getBody(Object[].class);
        LOG.info("Received output text: " + output[0]);
        // Get the response context form outMessage
        Map<String, Object> responseContext = CastUtils.cast((Map)out.getHeader(Client.RESPONSE_CONTEXT));
        assertNotNull(responseContext);
        assertEquals("Get the wrong wsdl opertion name", "{http://apache.org/hello_world_soap_http}greetMe", responseContext.get("javax.xml.ws.wsdl.operation").toString());

CXF Bean Component (2.0 or later)

The cxfbean: component allows other Camel endpoint to send exchange and invoke web service bean objects. (Currently, it only supports JAXRS annotated service bean.)

Note: CxfBeanEndpoint is a ProcessorEndpoint so it has no Consumers. It works similar to a Bean component.

URI format

cxfbean:serviceBeanRef

Where serviceBeanRef is a registry key to looks service bean object. If serviceBeanRef references to a List, elements of the List are the service bean objects accepted by the endpoint.

Options

Headers

Note: Currently, CXF Bean component has (only) been tested with Jetty HTTP component it can understand headers from Jetty HTTP component without requiring conversion.

A Working Sample

This sample shows how to create a route that starts a Jetty HTTP server. The route sends requests to a CXF Bean and invokes a JAXRS annotated service.

First, create a route as the following. The "from" endpoint is a Jetty HTTP endpoint that is listening on port 9000. Notice that the matchOnUriPrefix option must be set to true because RESTful request URI will not match the endpoint's URI "http://localhost:9000" exactly.

The "to" endpoint is a CXF Bean with bean name "customerServiceBean". The name will be looked up from the registry. Next, we make sure our service bean is available in Spring registry. We create a bean definition in the Spring configuration. In this example, we create a List of service beans (of one element). We could have created just a single bean without a List.

That's it. Once the route is started, the web service is ready for business. A HTTP client can make a request and receive response.