Chapter 291. SOAP DataFormat

Available as of Camel version 2.3

SOAP is a Data Format which uses JAXB2 and JAX-WS annotations to marshal and unmarshal SOAP payloads. It provides the basic features of Apache CXF without need for the CXF Stack.

Supported SOAP versions

SOAP 1.1 is supported by default. SOAP 1.2 is supported from Camel 2.11 onwards.

Namespace prefix mapping

See JAXB for details how you can control namespace prefix mappings when marshalling using SOAP data format.

291.1. SOAP Options

The SOAP dataformat supports 7 options which are listed below.

NameDefaultJava TypeDescription

contextPath

 

String

Package name where your JAXB classes are located.

encoding

 

String

To overrule and use a specific encoding

elementNameStrategyRef

 

String

Refers to an element strategy to lookup from the registry. An element name strategy is used for two purposes. The first is to find a xml element name for a given object and soap action when marshaling the object into a SOAP message. The second is to find an Exception class for a given soap fault name. The following three element strategy class name is provided out of the box. QNameStrategy - Uses a fixed qName that is configured on instantiation. Exception lookup is not supported TypeNameStrategy - Uses the name and namespace from the XMLType annotation of the given type. If no namespace is set then package-info is used. Exception lookup is not supported ServiceInterfaceStrategy - Uses information from a webservice interface to determine the type name and to find the exception class for a SOAP fault All three classes is located in the package name org.apache.camel.dataformat.soap.name If you have generated the web service stub code with cxf-codegen or a similar tool then you probably will want to use the ServiceInterfaceStrategy. In the case you have no annotated service interface you should use QNameStrategy or TypeNameStrategy.

version

1.1

String

SOAP version should either be 1.1 or 1.2. Is by default 1.1

namespacePrefixRef

 

String

When marshalling using JAXB or SOAP then the JAXB implementation will automatic assign namespace prefixes, such as ns2, ns3, ns4 etc. To control this mapping, Camel allows you to refer to a map which contains the desired mapping.

schema

 

String

To validate against an existing schema. Your can use the prefix classpath:, file: or http: to specify how the resource should by resolved. You can separate multiple schema files by using the ',' character.

contentTypeHeader

false

Boolean

Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc.

291.2. ElementNameStrategy

An element name strategy is used for two purposes. The first is to find a xml element name for a given object and soap action when marshaling the object into a SOAP message. The second is to find an Exception class for a given soap fault name.

StrategyUsage

QNameStrategy

Uses a fixed qName that is configured on instantiation. Exception lookup is not supported

TypeNameStrategy

Uses the name and namespace from the @XMLType annotation of the given type. If no namespace is set then package-info is used. Exception lookup is not supported

ServiceInterfaceStrategy

Uses information from a webservice interface to determine the type name and to find the exception class for a SOAP fault

If you have generated the web service stub code with cxf-codegen or a similar tool then you probably will want to use the ServiceInterfaceStrategy. In the case you have no annotated service interface you should use QNameStrategy or TypeNameStrategy.

291.3. Using the Java DSL

The following example uses a named DataFormat of soap which is configured with the package com.example.customerservice to initialize the JAXBContext. The second parameter is the ElementNameStrategy. The route is able to marshal normal objects as well as exceptions. (Note the below just sends a SOAP Envelope to a queue. A web service provider would actually need to be listening to the queue for a SOAP call to actually occur, in which case it would be a one way SOAP request. If you need request reply then you should look at the next example.)

SoapJaxbDataFormat soap = new SoapJaxbDataFormat("com.example.customerservice", new ServiceInterfaceStrategy(CustomerService.class));
from("direct:start")
  .marshal(soap)
  .to("jms:myQueue");
Tip

See also As the SOAP dataformat inherits from the JAXB dataformat most settings apply here as well

291.3.1. Using SOAP 1.2

Available as of Camel 2.11

SoapJaxbDataFormat soap = new SoapJaxbDataFormat("com.example.customerservice", new ServiceInterfaceStrategy(CustomerService.class));
soap.setVersion("1.2");
from("direct:start")
  .marshal(soap)
  .to("jms:myQueue");

When using XML DSL there is a version attribute you can set on the <soapjaxb> element.

    <!-- Defining a ServiceInterfaceStrategy for retrieving the element name when marshalling -->
    <bean id="myNameStrategy" class="org.apache.camel.dataformat.soap.name.ServiceInterfaceStrategy">
        <constructor-arg value="com.example.customerservice.CustomerService"/>
    <constructor-arg value="true"/>
    </bean>

And in the Camel route

<route>
  <from uri="direct:start"/>
  <marshal>
    <soapjaxb contentPath="com.example.customerservice" version="1.2" elementNameStrategyRef="myNameStrategy"/>
  </marshal>
  <to uri="jms:myQueue"/>
</route>

291.4. Multi-part Messages

Available as of Camel 2.8.1

Multi-part SOAP messages are supported by the ServiceInterfaceStrategy. The ServiceInterfaceStrategy must be initialized with a service interface definition that is annotated in accordance with JAX-WS 2.2 and meets the requirements of the Document Bare style. The target method must meet the following criteria, as per the JAX-WS specification: 1) it must have at most one in or in/out non-header parameter, 2) if it has a return type other than void it must have no in/out or out non-header parameters, 3) if it it has a return type of void it must have at most one in/out or out non-header parameter.

The ServiceInterfaceStrategy should be initialized with a boolean parameter that indicates whether the mapping strategy applies to the request parameters or response parameters.

ServiceInterfaceStrategy strat =  new ServiceInterfaceStrategy(com.example.customerservice.multipart.MultiPartCustomerService.class, true);
SoapJaxbDataFormat soapDataFormat = new SoapJaxbDataFormat("com.example.customerservice.multipart", strat);

291.4.1. Multi-part Request

The payload parameters for a multi-part request are initiazlied using a BeanInvocation object that reflects the signature of the target operation. The camel-soap DataFormat maps the content in the BeanInvocation to fields in the SOAP header and body in accordance with the JAX-WS mapping when the marshal() processor is invoked.

BeanInvocation beanInvocation = new BeanInvocation();

// Identify the target method
beanInvocation.setMethod(MultiPartCustomerService.class.getMethod("getCustomersByName",
    GetCustomersByName.class, com.example.customerservice.multipart.Product.class));

// Populate the method arguments
GetCustomersByName getCustomersByName = new GetCustomersByName();
getCustomersByName.setName("Dr. Multipart");

Product product = new Product();
product.setName("Multiuse Product");
product.setDescription("Useful for lots of things.");

Object[] args = new Object[] {getCustomersByName, product};

// Add the arguments to the bean invocation
beanInvocation.setArgs(args);

// Set the bean invocation object as the message body
exchange.getIn().setBody(beanInvocation);

291.4.2. Multi-part Response

A multi-part soap response may include an element in the soap body and will have one or more elements in the soap header. The camel-soap DataFormat will unmarshall the element in the soap body (if it exists) and place it onto the body of the out message in the exchange. Header elements will not be marshaled into their JAXB mapped object types. Instead, these elements are placed into the camel out message header org.apache.camel.dataformat.soap.UNMARSHALLED_HEADER_LIST. The elements will appear either as element instance values, or as JAXBElement values, depending upon the setting for the ignoreJAXBElement property. This property is inherited from camel-jaxb.

You can also have the camel-soap DataFormate ignore header content all-together by setting the ignoreUnmarshalledHeaders value to true.

291.4.3. Holder Object mapping

JAX-WS specifies the use of a type-parameterized javax.xml.ws.Holder object for In/Out and Out parameters. A Holder object may be used when building the BeanInvocation, or you may use an instance of the parameterized-type directly. The camel-soap DataFormat marshals Holder values in accordance with the JAXB mapping for the class of the Holder’s value. No mapping is provided for `Holder objects in an unmarshalled response.

291.5. Examples

291.5.1. Webservice client

The following route supports marshalling the request and unmarshalling a response or fault.

String WS_URI = "cxf://http://myserver/customerservice?serviceClass=com.example.customerservice&dataFormat=MESSAGE";
SoapJaxbDataFormat soapDF = new SoapJaxbDataFormat("com.example.customerservice", new ServiceInterfaceStrategy(CustomerService.class));
from("direct:customerServiceClient")
  .onException(Exception.class)
    .handled(true)
    .unmarshal(soapDF)
  .end()
  .marshal(soapDF)
  .to(WS_URI)
  .unmarshal(soapDF);

The below snippet creates a proxy for the service interface and makes a SOAP call to the above route.

import org.apache.camel.Endpoint;
import org.apache.camel.component.bean.ProxyHelper;
...

Endpoint startEndpoint = context.getEndpoint("direct:customerServiceClient");
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
// CustomerService below is the service endpoint interface, *not* the javax.xml.ws.Service subclass
CustomerService proxy = ProxyHelper.createProxy(startEndpoint, classLoader, CustomerService.class);
GetCustomersByNameResponse response = proxy.getCustomersByName(new GetCustomersByName());

291.5.2. Webservice Server

Using the following route sets up a webservice server that listens on jms queue customerServiceQueue and processes requests using the class CustomerServiceImpl. The customerServiceImpl of course should implement the interface CustomerService. Instead of directly instantiating the server class it could be defined in a spring context as a regular bean.

SoapJaxbDataFormat soapDF = new SoapJaxbDataFormat("com.example.customerservice", new ServiceInterfaceStrategy(CustomerService.class));
CustomerService serverBean = new CustomerServiceImpl();
from("jms://queue:customerServiceQueue")
  .onException(Exception.class)
    .handled(true)
    .marshal(soapDF)
  .end()
  .unmarshal(soapDF)
  .bean(serverBean)
  .marshal(soapDF);

291.6. Dependencies

To use the SOAP dataformat in your camel routes you need to add the following dependency to your pom.

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-soap</artifactId>
  <version>2.3.0</version>
</dependency>