Chapter 15. Configuring JAX-WS Endpoints
Abstract
JAX-WS endpoints are configured using one of three Spring configuration elements. The correct element depends on what type of endpoint you are configuring and which features you wish to use. For consumers you use the
jaxws:client element. For service providers you can use either the jaxws:endpoint element or the jaxws:server element.
The information used to define an endpoint is typically defined in the endpoint's contract. You can use the configuration element's to override the information in the contract. You can also use the configuration elements to provide information that is not provided in the contract.
You must use the configuration elements to activate advanced features such as WS-RM. This is done by providing child elements to the endpoint's configuration element. Note that when dealing with endpoints developed using a Java-first approach it is likely that the SEI serving as the endpoint's contract is lacking information about the type of binding and transport to use.
15.1. Configuring Service Providers
15.1.1. Elements for Configuring Service Providers
Apache CXF has two elements that can be used to configure a service provider:
The differences between the two elements are largely internal to the runtime. The
jaxws:endpoint element injects properties into the org.apache.cxf.jaxws.EndpointImpl object created to support a service endpoint. The jaxws:server element injects properties into the org.apache.cxf.jaxws.support.JaxWsServerFactoryBean object created to support the endpoint. The EndpointImpl object passes the configuration data to the JaxWsServerFactoryBean object. The JaxWsServerFactoryBean object is used to create the actual service object. Because either configuration element will configure a service endpoint, you can choose based on the syntax you prefer.
15.1.2. Using the jaxws:endpoint Element
Overview
The
jaxws:endpoint element is the default element for configuring JAX-WS service providers. Its attributes and children specify all of the information needed to instantiate a service provider. Many of the attributes map to information in the service's contract. The children are used to configure interceptors and other advanced features.
Identifying the endpoint being configured
For the runtime to apply the configuration to the proper service provider, it must be able to identify it. The basic means for identifying a service provider is to specify the class that implements the endpoint. This is done using the
jaxws:endpoint element's implementor attribute.
For instances where different endpoint's share a common implementation, it is possible to provide different configuration for each endpoint. There are two approaches for distinguishing a specific endpoint in configuration:
- a combination of the
serviceNameattribute and theendpointNameattributeTheserviceNameattribute specifies thewsdl:serviceelement defining the service's endpoint. TheendpointNameattribute specifies the specificwsdl:portelement defining the service's endpoint. Both attributes are specified as QNames using the formatns:name. ns is the namespace of the element and name is the value of the element'snameattribute.NoteIf thewsdl:serviceelement only has onewsdl:portelement, theendpointNameattribute can be omitted. - the
nameattributeThenameattribute specifies the QName of the specificwsdl:portelement defining the service's endpoint. The QName is provided in the format{ns}localPart. ns is the namespace of thewsdl:portelement and localPart is the value of thewsdl:portelement'snameattribute.
Attributes
The attributes of the
jaxws:endpoint element configure the basic properties of the endpoint. These properties include the address of the endpoint, the class that implements the endpoint, and the bus that hosts the endpoint.
Table 15.1, “Attributes for Configuring a JAX-WS Service Provider Using the jaxws:endpoint Element” describes the attribute of the
jaxws:endpoint element.
| Attribute | Description |
|---|---|
id | Specifies a unique identifier that other configuration elements can use to refer to the endpoint. |
implementor | Specifies the class implementing the service. You can specify the implementation class using either the class name or an ID reference to a Spring bean configuring the implementation class. This class must be on the classpath. |
implementorClass | Specifies the class implementing the service. This attribute is useful when the value provided to the implementor attribute is a reference to a bean that is wrapped using Spring AOP. |
address | Specifies the address of an HTTP endpoint. This value overrides the value specified in the services contract. |
wsdlLocation | Specifies the location of the endpoint's WSDL contract. The WSDL contract's location is relative to the folder from which the service is deployed. |
endpointName | Specifies the value of the service's wsdl:port element's name attribute. It is specified as a QName using the format ns:name where ns is the namespace of the wsdl:port element. |
serviceName | Specifies the value of the service's wsdl:service element's name attribute. It is specified as a QName using the format ns:name where ns is the namespace of the wsdl:service element. |
publish | Specifies if the service should be automatically published. If this is set to false, the developer must explicitly publish the endpoint as described in Chapter 31, Publishing a Service. |
bus | Specifies the ID of the Spring bean configuring the bus used to manage the service endpoint. This is useful when configuring several endpoints to use a common set of features. |
bindingUri | Specifies the ID of the message binding the service uses. A list of valid binding IDs is provided in Appendix C, Apache CXF Binding IDs. |
name | Specifies the stringified QName of the service's wsdl:port element. It is specified as a QName using the format {ns}localPart. ns is the namespace of the wsdl:port element and localPart is the value of the wsdl:port element's name attribute. |
abstract | Specifies if the bean is an abstract bean. Abstract beans act as parents for concrete bean definitions and are not instantiated. The default is false. Setting this to true instructs the bean factory not to instantiate the bean. |
depends-on | Specifies a list of beans that the endpoint depends on being instantiated before it can be instantiated. |
createdFromAPI |
Specifies that the user created that bean using Apache CXF APIs, such as
Endpoint.publish() or Service.getPort().
The default is
false.
Setting this to
true does the following:
|
publishedEndpointUrl | The URL that is placed in the address element of the generated WSDL. If this value is not specified, the value of the address attribute is used. This attribute is useful when the "public" URL is not be the same as the URL on which the service is deployed. |
In addition to the attributes listed in Table 15.1, “Attributes for Configuring a JAX-WS Service Provider Using the jaxws:endpoint Element”, you might need to use multiple
xmlns:shortName attributes to declare the namespaces used by the endpointName and serviceName attributes.
Example
Example 15.1, “Simple JAX-WS Endpoint Configuration” shows the configuration for a JAX-WS endpoint that specifies the address where the endpoint is published. The example assumes that you want to use the defaults for all other values or that the implementation has specified values in the annotations.
Example 15.1. Simple JAX-WS Endpoint Configuration
<beans ...
xmlns:jaxws="http://cxf.apache.org/jaxws"
...
schemaLocation="...
http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
...">
<jaxws:endpoint id="example"
implementor="org.apache.cxf.example.DemoImpl"
address="http://localhost:8080/demo" />
</beans>
Example 15.2, “JAX-WS Endpoint Configuration with a Service Name” shows the configuration for a JAX-WS endpoint whose contract contains two service definitions. In this case, you must specify which service definition to instantiate using the
serviceName attribute.
Example 15.2. JAX-WS Endpoint Configuration with a Service Name
<beans ...
xmlns:jaxws="http://cxf.apache.org/jaxws"
...
schemaLocation="...
http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
...">
<jaxws:endpoint id="example2"
implementor="org.apache.cxf.example.DemoImpl"
serviceName="samp:demoService2"
xmlns:samp="http://org.apache.cxf/wsdl/example" />
</beans>
The
xmlns:samp attribute specifies the namespace in which the WSDL service element is defined.
15.1.3. Using the jaxws:server Element
Overview
The
jaxws:server element is an element for configuring JAX-WS service providers. It injects the configuration information into the org.apache.cxf.jaxws.support.JaxWsServerFactoryBean. This is a Apache CXF specific object. If you are using a pure Spring approach to building your services, you will not be forced to use Apache CXF specific APIs to interact with the service.
The attributes and children of the
jaxws:server element specify all of the information needed to instantiate a service provider. The attributes specify the information that is required to instantiate an endpoint. The children are used to configure interceptors and other advanced features.
Identifying the endpoint being configured
In order for the runtime to apply the configuration to the proper service provider, it must be able to identify it. The basic means for identifying a service provider is to specify the class that implements the endpoint. This is done using the
jaxws:server element's serviceBean attribute.
For instances where different endpoint's share a common implementation, it is possible to provide different configuration for each endpoint. There are two approaches for distinguishing a specific endpoint in configuration:
- a combination of the
serviceNameattribute and theendpointNameattributeTheserviceNameattribute specifies thewsdl:serviceelement defining the service's endpoint. TheendpointNameattribute specifies the specificwsdl:portelement defining the service's endpoint. Both attributes are specified as QNames using the formatns:name. ns is the namespace of the element and name is the value of the element'snameattribute.NoteIf thewsdl:serviceelement only has onewsdl:portelement, theendpointNameattribute can be omitted. - the
nameattributeThenameattribute specifies the QName of the specificwsdl:portelement defining the service's endpoint. The QName is provided in the format{ns}localPart. ns is the namespace of thewsdl:portelement and localPart is the value of thewsdl:portelement'snameattribute.
Attributes
The attributes of the
jaxws:server element configure the basic properties of the endpoint. These properties include the address of the endpoint, the class that implements the endpoint, and the bus that hosts the endpoint.
Table 15.2, “Attributes for Configuring a JAX-WS Service Provider Using the jaxws:server Element” describes the attribute of the
jaxws:server element.
| Attribute | Description |
|---|---|
id | Specifies a unique identifier that other configuration elements can use to refer to the endpoint. |
serviceBean | Specifies the class implementing the service. You can specify the implementation class using either the class name or an ID reference to a Spring bean configuring the implementation class. This class must be on the classpath. |
serviceClass | Specifies the class implementing the service. This attribute is useful when the value provided to the implementor attribute is a reference to a bean that is wrapped using Spring AOP. |
address | Specifies the address of an HTTP endpoint. This value will override the value specified in the services contract. |
wsdlLocation | Specifies the location of the endpoint's WSDL contract. The WSDL contract's location is relative to the folder from which the service is deployed. |
endpointName | Specifies the value of the service's wsdl:port element's name attribute. It is specified as a QName using the format ns:name, where ns is the namespace of the wsdl:port element. |
serviceName | Specifies the value of the service's wsdl:service element's name attribute. It is specified as a QName using the format ns:name, where ns is the namespace of the wsdl:service element. |
publish | Specifies if the service should be automatically published. If this is set to false, the developer must explicitly publish the endpoint as described in Chapter 31, Publishing a Service. |
bus | Specifies the ID of the Spring bean configuring the bus used to manage the service endpoint. This is useful when configuring several endpoints to use a common set of features. |
bindingId | Specifies the ID of the message binding the service uses. A list of valid binding IDs is provided in Appendix C, Apache CXF Binding IDs. |
name | Specifies the stringified QName of the service's wsdl:port element. It is specified as a QName using the format {ns}localPart, where ns is the namespace of the wsdl:port element and localPart is the value of the wsdl:port element's name attribute. |
abstract | Specifies if the bean is an abstract bean. Abstract beans act as parents for concrete bean definitions and are not instantiated. The default is false. Setting this to true instructs the bean factory not to instantiate the bean. |
depends-on | Specifies a list of beans that the endpoint depends on being instantiated before the endpoint can be instantiated. |
createdFromAPI |
Specifies that the user created that bean using Apache CXF APIs, such as
Endpoint.publish() or Service.getPort().
The default is
false.
Setting this to
true does the following:
|
In addition to the attributes listed in Table 15.2, “Attributes for Configuring a JAX-WS Service Provider Using the jaxws:server Element”, you might need to use multiple
xmlns:shortName attributes to declare the namespaces used by the endpointName and serviceName attributes.
Example
Example 15.3, “Simple JAX-WS Server Configuration” shows the configuration for a JAX-WS endpoint that specifies the address where the endpoint is published.
Example 15.3. Simple JAX-WS Server Configuration
<beans ...
xmlns:jaxws="http://cxf.apache.org/jaxws"
...
schemaLocation="...
http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
...">
<jaxws:server id="exampleServer"
serviceBean="org.apache.cxf.example.DemoImpl"
address="http://localhost:8080/demo" />
</beans>15.1.4. Adding Functionality to Service Providers
Overview
The
jaxws:endpoint and the jaxws:server elements provide the basic configuration information needed to instantiate a service provider. To add functionality to your service provider or to perform advanced configuration you must add child elements to the configuration.
Child elements allow you to do the following:
Elements
Table 15.3, “Elements Used to Configure JAX-WS Service Providers” describes the child elements that
jaxws:endpoint supports.
| Element | Description |
|---|---|
jaxws:handlers | Specifies a list of JAX-WS Handler implementations for processing messages. For more information on JAX-WS Handler implementations see Chapter 43, Writing Handlers. |
jaxws:inInterceptors | Specifies a list of interceptors that process inbound requests. For more information see Part VII, “Developing Apache CXF Interceptors”. |
jaxws:inFaultInterceptors | Specifies a list of interceptors that process inbound fault messages. For more information see Part VII, “Developing Apache CXF Interceptors”. |
jaxws:outInterceptors | Specifies a list of interceptors that process outbound replies. For more information see Part VII, “Developing Apache CXF Interceptors”. |
jaxws:outFaultInterceptors | Specifies a list of interceptors that process outbound fault messages. For more information see Part VII, “Developing Apache CXF Interceptors”. |
jaxws:binding | Specifies a bean configuring the message binding used by the endpoint. Message bindings are configured using implementations of the org.apache.cxf.binding.BindingFactory interface.[a] |
jaxws:dataBinding [b] | Specifies the class implementing the data binding used by the endpoint. This is specified using an embedded bean definition. |
jaxws:executor | Specifies a Java executor that is used for the service. This is specified using an embedded bean definition. |
jaxws:features | Specifies a list of beans that configure advanced features of Apache CXF. You can provide either a list of bean references or a list of embedded beans. |
jaxws:invoker | Specifies an implementation of the org.apache.cxf.service.Invoker interface used by the service. [c] |
jaxws:properties | Specifies a Spring map of properties that are passed along to the endpoint. These properties can be used to control features like enabling MTOM support. |
jaxws:serviceFactory | Specifies a bean configuring the JaxWsServiceFactoryBean object used to instantiate the service. |
[a]
The SOAP binding is configured using the soap:soapBinding bean.
[c]
The Invoker implementation controls how a service is invoked. For example, it controls whether each request is handled by a new instance of the service implementation or if state is preserved across invocations.
| |
