CXF Component
When using CXF as a consumer, the CXF Bean Component allows you to factor out how message payloads are received from their processing as a RESTful or SOAP web service. This has the potential of using a multitude of transports to consume web services. The bean component's configuration is also simpler and provides the fastest method to implement web services using Camel and CXF.
The cxf: component provides integration with Apache CXF for connecting to JAX-WS services hosted in CXF.
- CXF Component
- URI format
- Options
- Configure the CXF endpoints with Spring
- Configuring the CXF Endpoints with Apache Aries Blueprint.
- How to make the camel-cxf component use log4j instead of java.util.logging
- How to let camel-cxf response message with xml start document
- How to consume a message from a camel-cxf endpoint in POJO data format
- How to prepare the message for the camel-cxf endpoint in POJO data format
- How to deal with the message for a camel-cxf endpoint in PAYLOAD data format
- How to get and set SOAP headers in POJO mode
- How to get and set SOAP headers in PAYLOAD mode
- SOAP headers are not available in MESSAGE mode
- How to throw a SOAP Fault from Camel
- How to propagate a camel-cxf endpoint's request and response context
- Attachment Support
- Streaming Support in PAYLOAD mode
- See Also
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>
CXF dependencies
If you want to learn about CXF dependencies you can checkout the WHICH-JARS
text file.
URI format
cxf:bean:cxfEndpoint[?options]
Where cxfEndpoint represents a bean ID that references a bean in the Spring bean registry. With this URI format, most of the endpoint details are specified in the bean definition.
cxf://someAddress[?options]
Where someAddress specifies the CXF endpoint's address. With this URI format, most of the endpoint details are specified using options.
For either style above, you can append options to the URI as follows:
cxf:bean:cxfEndpoint?wsdlURL=wsdl/hello_world.wsdl&dataFormat=PAYLOAD
Options
Name |
Required |
Description |
---|---|---|
|
No |
The location of the WSDL. It is obtained from endpoint address by default. |
|
Yes |
The name of the SEI (Service Endpoint Interface) class. This class can have, but does not require, JSR181 annotations. |
|
No |
Use either |
|
No |
The service name this service is implementing, it maps to the |
|
No |
The port name this service is implementing, it maps to the |
|
No |
The data type messages supported by the CXF endpoint. |
|
No |
Available since 1.6.1. Please see the Description of |
|
No |
Which kind of operation that CXF endpoint producer will invoke |
|
No |
New in 2.5.0 The WSDL style that describes how parameters are represented in the SOAP body. If the value is false, CXF will chose the document-literal unwrapped style, If the value is true, CXF will chose the document-literal wrapped style |
|
No |
Will set the default bus when CXF endpoint create a bus by itself |
|
No |
New in 2.0.0. A default bus created by CXF Bus Factory. Use |
|
No |
New in 2.0. Use |
|
No |
New in 2.0. Use |
|
No |
New in 2.3. This option enables CXF Logging Feature which writes inbound and outbound SOAP messages to log. |
|
No |
New in 2.4, this option will set the default operationName that will be used by the CxfProducer which invokes the remote service. |
|
No |
New in 2.4. This option will set the default operationNamespace that will be used by the CxfProducer which invokes the remote service. |
|
No |
New in 2.5. This option will let cxf endpoint decide to use sync or async API to do the underlying work. The default value is false which means camel-cxf endpoint will try to use async API by default. |
|
No |
New in 2.5. This option can override the endpointUrl that published from the WSDL which can be accessed with service address url plus ?wsdl. |
|
No |
Camel 2.8: Allows to set custom properties to CXF in the endpoint uri. For example setting |
|
No |
New in 2.8.2. This option controls whether the CXF component, when running in PAYLOAD mode (see below), will DOM parse the incoming messages into DOM Elements or keep the payload as a javax.xml.transform.Source object that would allow streaming in some cases. |
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 a CXF producer (that is, the to
endpoint) should be a Java interface.
The descriptions of the dataformats
DataFormat |
Description |
---|---|
|
POJOs (Plain old Java objects) are the Java parameters to the method being invoked on the target server. Both Protocol and Logical JAX-WS handlers are supported. |
|
|
|
|
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
.
How to enable CXF's LoggingOutInterceptor in MESSAGE mode
CXF's LoggingOutInterceptor
outputs outbound message that goes on the wire to logging system (Java Util Logging). Since the LoggingOutInterceptor
is in PRE_STREAM
phase (but PRE_STREAM
phase is removed in MESSAGE
mode), you have to configure LoggingOutInterceptor
to be run during the WRITE
phase. The following is an example.
Description of relayHeaders option
There are in-band and out-of-band on-the-wire headers from the 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/filtering 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.
Available in Release 1.6.1 and after (only in POJO mode)
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 the MessageHeadersRelay
interface. A concrete implementation of 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
setting 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:
Changes since Release 2.0
POJO
andPAYLOAD
modes are supported. InPOJO
mode, only out-of-band message headers are available for filtering as the in-band headers have been processed and removed from header list by CXF. The in-band headers are incorporated into theMessageContentList
in POJO mode. Thecamel-cxf
component does make any attempt to remove the in-band headers from theMessageContentList
as it does in 1.6.1. If filtering of in-band headers is required, please usePAYLOAD
mode or plug in a (pretty straightforward) CXF interceptor/JAXWS Handler to the CXF endpoint.- The Message Header Relay mechanism has been merged into
CxfHeaderFilterStrategy
. TherelayHeaders
option, its semantics, and default value remain the same, but it is a property ofCxfHeaderFilterStrategy
.
Here is an example of configuring it.Error formatting macro: snippet: java.lang.NullPointerExceptionThen, your endpoint can reference theCxfHeaderFilterStrategy
.Error formatting macro: snippet: java.lang.NullPointerException - The
MessageHeadersRelay
interface has changed slightly and has been renamed toMessageHeaderFilter
. It is a property ofCxfHeaderFilterStrategy
. Here is an example of configuring user defined Message Header Filters:Error formatting macro: snippet: java.lang.NullPointerException - Other than
relayHeaders
, there are new properties that can be configured inCxfHeaderFilterStrategy
.Unknown macro: {div}Name
Required
Description
relayHeaders
No
All message headers will be processed by Message Header Filters
Type:boolean
Default:true
(1.6.1 behavior)relayAllMessageHeaders
No
All message headers will be propagated (without processing by Message Header Filters)
Type:boolean
Default:false
(1.6.1 behavior)allowFilterNamespaceClash
No
If two filters overlap in activation namespace, the property control how it should be handled. If the value is
true
, last one wins. If the value isfalse
, it will throw an exception
Type:boolean
Default:false
(1.6.1 behavior)Configure the CXF endpoints with Spring
You can configure the CXF endpoint with the Spring configuration file shown below, and you can also embed the endpoint into the
camelContext
tags. When you are invoking the service endpoint, you can set theoperationName
andoperationNamespace
headers to explicitly state which operation you are calling.<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 CXF endpoint'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.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:Unknown macro: {div}Name
Value
PortName
The endpoint name this service is implementing, it maps to the
wsdl:port@name
. In the format ofns:PORT_NAME
wherens
is a namespace prefix valid at this scope.serviceName
The service name this service is implementing, it maps to the
wsdl:service@name
. In the format ofns:SERVICE_NAME
wherens
is a namespace prefix valid at this scope.wsdlURL
The location of the WSDL. Can be on the classpath, file system, or be hosted remotely.
bindingId
The
bindingId
for the service model to use.address
The service publish address.
bus
The bus name that will be used in the JAX-WS endpoint.
serviceClass
The class name of the SEI (Service Endpoint Interface) class which could have JSR181 annotation or not.
It also supports many child elements:
Name
Value
cxf:inInterceptors
The incoming interceptors for this endpoint. A list of
<bean>
or<ref>
.cxf:inFaultInterceptors
The incoming fault interceptors for this endpoint. A list of
<bean>
or<ref>
.cxf:outInterceptors
The outgoing interceptors for this endpoint. A list of
<bean>
or<ref>
.cxf:outFaultInterceptors
The outgoing fault interceptors for this endpoint. A list of
<bean>
or<ref>
.cxf:properties
A properties map which should be supplied to the JAX-WS endpoint. See below.
cxf:handlers
A JAX-WS handler list which should be supplied to the JAX-WS endpoint. See below.
cxf:dataBinding
You can specify the which
DataBinding
will be use in the endpoint. This can be supplied using the Spring<bean class="MyDataBinding"/>
syntax.cxf:binding
You can specify the
BindingFactory
for this endpoint to use. This can be supplied using the Spring<bean class="MyBindingFactory"/>
syntax.cxf:features
The features that hold the interceptors for this endpoint. A list of {{<bean>}}s or {{<ref>}}s
cxf:schemaLocations
The schema locations for endpoint to use. A list of {{<schemaLocation>}}s
cxf:serviceFactory
The service factory for this endpoint to use. This can be supplied using the Spring
<bean class="MyServiceFactory"/>
syntax
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>
Configuring the CXF Endpoints with Apache Aries Blueprint.
Since camel 2.8 there is support for utilizing aries blueprint dependency injection for your CXF endpoints.
The schema utilized is very similar to the spring schema so the transition is fairly transparent.
Example
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0" xmlns:camel-cxf="http://camel.apache.org/schema/blueprint/cxf" xmlns:cxfcore="http://cxf.apache.org/blueprint/core" xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd"> <camel-cxf:cxfEndpoint id="routerEndpoint" address="http://localhost:9001/router" serviceClass="org.apache.servicemix.examples.cxf.HelloWorld"> <camel-cxf:properties> <entry key="dataFormat" value="MESSAGE"/> </camel-cxf:properties> </camel-cxf:cxfEndpoint> <camel-cxf:cxfEndpoint id="serviceEndpoint" address="http://localhost:9000/SoapContext/SoapPort" serviceClass="org.apache.servicemix.examples.cxf.HelloWorld"> </camel-cxf:cxfEndpoint> <camelContext xmlns="http://camel.apache.org/schema/blueprint"> <route> <from uri="routerEndpoint"/> <to uri="log:request"/> </route> </camelContext> </blueprint>
Currently the endpoint element is the first supported CXF namespacehandler.
You can also use the bean references just as in spring
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0" xmlns:jaxws="http://cxf.apache.org/blueprint/jaxws" xmlns:cxf="http://cxf.apache.org/blueprint/core" xmlns:camel="http://camel.apache.org/schema/blueprint" xmlns:camelcxf="http://camel.apache.org/schema/blueprint/cxf" xsi:schemaLocation=" http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd http://cxf.apache.org/blueprint/jaxws http://cxf.apache.org/schemas/blueprint/jaxws.xsd http://cxf.apache.org/blueprint/core http://cxf.apache.org/schemas/blueprint/core.xsd "> <camelcxf:cxfEndpoint id="reportIncident" address="/camel-example-cxf-blueprint/webservices/incident" wsdlURL="META-INF/wsdl/report_incident.wsdl" serviceClass="org.apache.camel.example.reportincident.ReportIncidentEndpoint"> </camelcxf:cxfEndpoint> <bean id="reportIncidentRoutes" class="org.apache.camel.example.reportincident.ReportIncidentRoutes" /> <camelContext xmlns="http://camel.apache.org/schema/blueprint"> <routeBuilder ref="reportIncidentRoutes"/> </camelContext> </blueprint>
How to make the camel-cxf component use log4j instead of java.util.logging
CXF's default logger is java.util.logging
. If you want to change it to log4j, proceed as follows. 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 let camel-cxf response message with xml start document
If you are using some soap client such as PHP, you will get this kind of error, because CXF doesn't add the XML start document "<?xml version="1.0" encoding="utf-8"?>"
Error:sendSms: SoapFault exception: [Client] looks like we got no XML document in [...]
To resolved this issue, you just need to tell StaxOutInterceptor to write the XML start document for you.
You can add a customer interceptor like this and configure it into you camel-cxf endpont
Or adding a message header for it like this if you are using Camel 2.4.
// set up the response context which force start document Map<String, Object> map = new HashMap<String, Object>(); map.put("org.apache.cxf.stax.force-start-document", Boolean.TRUE); exchange.getOut().setHeader(Client.RESPONSE_CONTEXT, map);
How to consume a message from a 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 to a list, and initialize the message with this parameter list. 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 using message.getbody(Object[].class)
, as follows:
How to deal with the message for a camel-cxf endpoint in PAYLOAD data format
PAYLOAD
means that you process the payload message from the SOAP envelope. 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.
Camel 1.x branch, you can get the List<Element>
and header from the CXF Message, but if you want to set the response message, you need to create the CXF message using the CXF API.
Change in 2.0, There is no more CxfMessage
, we just use the common Camel DefaultMessageImpl
under layer. Message.getBody()
will return an 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 get and set SOAP headers in POJO mode
POJO
means that the data format is a "list of Java objects" when the Camel-cxf endpoint produces or consumes Camel exchanges. Even though Camel expose message body as POJOs in this mode, Camel-cxf still provides access to read and write SOAP headers. However, since CXF interceptors remove in-band SOAP headers from Header list after they have been processed, only out-of-band SOAP headers are available to Camel-cxf in POJO mode.
The following example illustrate how to get/set SOAP headers. Suppose we have a route that forwards from one Camel-cxf endpoint to another. That is, SOAP Client -> Camel -> CXF service. We can attach two processors to obtain/insert SOAP headers at (1) before request goes out to the CXF service and (2) before response comes back to the SOAP Client. Processor (1) and (2) in this example are InsertRequestOutHeaderProcessor and InsertResponseOutHeaderProcessor. Our route looks like this:
In 2.x SOAP headers are propagated to and from Camel Message headers. The Camel message header name is "org.apache.cxf.headers.Header.list" which is a constant defined in CXF (org.apache.cxf.headers.Header.HEADER_LIST). The header value is a List of CXF SoapHeader objects (org.apache.cxf.binding.soap.SoapHeader). The following snippet is the InsertResponseOutHeaderProcessor (that insert a new SOAP header in the response message). The way to access SOAP headers in both InsertResponseOutHeaderProcessor and InsertRequestOutHeaderProcessor are actually the same. The only difference between the two processors is setting the direction of the inserted SOAP header.
In 1.x SOAP headers are not propagated to and from Camel Message headers. Users have to go deeper into CXF APIs to access SOAP headers. Also, accessing the SOAP headers in a request message is slight different than in a response message. The InsertRequestOutHeaderProcessor and InsertResponseOutHeaderProcessor are as follow.
How to get and set SOAP headers in PAYLOAD mode
We've already shown how to access SOAP message (CxfPayload object) in PAYLOAD mode (See "How to deal with the message for a camel-cxf endpoint in PAYLOAD data format").
In 2.x Once you obtain a CxfPayload object, you can invoke the CxfPayload.getHeaders() method that returns a List of DOM Elements (SOAP headers).
*In 1.x" You can get/set to the CXF Message by the key "org.apache.cxf.headers.Header.list" which is a constant defined in CXF (org.apache.cxf.headers.Header.HEADER_LIST).
SOAP headers are not available in MESSAGE mode
SOAP headers are not available in MESSAGE mode as SOAP processing is skipped.
How to throw a SOAP Fault from Camel
If you are using a 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 is working in the MESSAGE
data format, you could set the the SOAP Fault message in 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
Same for using POJO data format. You can set the SOAPFault on the out body and also indicate it's a fault by calling Message.setFault(true):
How to propagate a 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 a
camel-cxf
endpoint producer to invoke the outside web service, you can set the request context and get response context with the following code:
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());
Attachment Support
POJO Mode: Both SOAP with Attachment and MTOM are supported (see example in Payload Mode for enabling MTOM). However, SOAP with Attachment is not tested. Since attachments are marshalled and unmarshalled into POJOs, users typically do not need to deal with the attachment themself. Attachments are propagated to Camel message's attachments since 2.1. So, it is possible to retreive attachments by Camel Message API
DataHandler Message.getAttachment(String id)
.
Payload Mode: MTOM is supported since 2.1. Attachments can be retrieved by Camel Message APIs mentioned above. SOAP with Attachment (SwA) is supported and attachments can be retrieved since 2.5. SwA is the default (same as setting the CXF endpoint property "mtom_enabled" to false).
To enable MTOM, set the CXF endpoint property "mtom_enabled" to true. (I believe you can only do it with Spring.)
You can produce a Camel message with attachment to send to a CXF endpoint in Payload mode.
You can also consume a Camel message received from a CXF endpoint in Payload mode.
Message Mode: Attachments are not supported as it does not process the message at all.
Streaming Support in PAYLOAD mode
In 2.8.2, the camel-cxf component now supports streaming of incoming messages when using PAYLOAD mode. Previously, the incoming messages would have been completely DOM parsed. For large messages, this is time consuming and uses a significant amount of memory. Starting in 2.8.2, the incoming messages can remain as a javax.xml.transform.Source while being routed and, if nothing modifies the payload, can then be directly streamed out to the target destination. For common "simple proxy" use cases (example: from("cxf:...").to("cxf:...")), this can provide very significant performance increases as well as significantly lowered memory requirements.
However, there are cases where streaming may not be appropriate or desired. Due to the streaming nature, invalid incoming XML may not be caught until later in the processing chain. Also, certain actions may require the message to be DOM parsed anyway (like WS-Security or message tracing and such) in which case the advantages of the streaming is limited. At this point, there are two ways to control the streaming:
- Endpoint property: you can add "allowStreaming=false" as an endpoint property to turn the streaming on/off.
- Component property: the CxfComponent object also has an allowStreaming property that can set the default for endpoints created from that component.
- Global system property: you can add a system property of "org.apache.camel.component.cxf.streaming" to "false" to turn if off. That sets the global default, but setting the endpoint property above will override this value for that endpoint.