Annotations - 6.2

Talend ESB Service Developer Guide

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CXF provides several custom annotations that can be used to configure and customize the CXF runtime.

org.apache.cxf.feature.Features

The @Features annotation is used to add Features, something that is able to customize a Server, Client, or Bus, typically by adding capabilities. See the CXF Features List for those provided "out of the box" by CXF. You can also create your own features. In many cases, however, those features have Annotations themselves which can be used and provide greater control over configuration.

org.apache.cxf.interceptor.InInterceptors, org.apache.cxf.interceptor.OutInterceptors, org.apache.cxf.interceptor.OutFaultInterceptors, org.apache.cxf.interceptor.InFaultInterceptors

Add interceptors to the various chains used to process messages.

org.apache.cxf.annotations.WSDLDocumentation org.apache.cxf.annotations.WSDLDocumentationCollection (since 2.3)

For "java first" scenarios where the WSDL is derived from the Java interfaces/code, these annotations allow adding wsd:documentation elements to various locations in the generated wsdl.

For example:

@WebService
@WSDLDocumentationCollection(
   {
      @WSDLDocumentation("My portType documentation"),
      @WSDLDocumentation(value = "My top level documentation",
         placement = WSDLDocumentation.Placement.TOP),
      @WSDLDocumentation(value = "My binding doc",
         placement = WSDLDocumentation.Placement.BINDING)
   }
)
public interface MyService {

   @WSDLDocumentation("The docs for echoString")
   String echoString(String s);

}

org.apache.cxf.annotations.SchemaValidation (since 2.3)

Turns on SchemaValidation for messages. By default, for performance reasons, CXF does not validate message against the schema. By turning on validation, problems with messages not matching the schema are easier to determine.

org.apache.cxf.annotations.DataBinding (since 2.2.4)

Sets the DataBinding class that is associated with the service. By default, CXF assumes you are using the JAXB data binding. However, CXF supports different databindings such as XMLBeans, Aegis, SDO, and possibly more. This annotation can be used in place of configuration to select the databinding class.

@DataBinding(org.apache.cxf.sdo.SDODataBinding.class)
public interface MyService {
   public commonj.sdo.DataObject echoStruct(
      commonj.sdo.DataObject struct
   );
}

org.apache.cxf.annotations.Logging (since 2.3)

Turns on logging for the endpoint. Can be used to control the size limits of what gets logged as well as the location. It supports the following attributes:

limit

Sets the size limit after which the message is truncated in the logs. Default is 64K

inLocation

Sets the location to log incoming messages. Can be <stderr>, <stdout>, <logger>, or a file: URL. Default is <logger>

outLocation

Sets the location to log outgoing messages. Can be <stderr>, <stdout>, <logger>, or a file: URL. Default is <logger>

@Logging(limit=16000, inLocation="<stdout>")
public interface MyService {

   String echoString(String s);

}

org.apache.cxf.annotations.GZIP (since 2.3)

Enables GZIP compression of on-the-wire data. Supported attributes:

threshold

the threshold under which messages are not gzipped

GZIP is a negotiated enhancement. An initial request from a client will not be gzipped, but an Accept header will be added and if the server supports it, the response will be gzipped and any subsequent requests will be.

org.apache.cxf.annotations.FastInfoset (since 2.3)

Enables FastInfoset of on-the-wire data. Supported attributes:

force

forces the use of fastinfoset instead of negotiating. Default is false

FastInfoset is a negotiated enhancement. An initial request from a client will not be in fastinfoset, but an Accept header will be added and if the server supports it, the response will be in fastinfoset and any subsequent requests will be.

org.apache.cxf.annotations.EndpointProperty org.apache.cxf.annotations.EndpointProperties (since 2.3)

Adds a property to an endpoint. Many things such as WS-Security related things and such can be configured via endpoint properties. Traditionally, these would be set via the <jaxws:properties> element on the <jaxws:endpoint> element in the spring config, but these annotations allow these properties to be configured into the code.

@WebService
@EndpointProperties(
   {
      @EndpointProperty(key = "my.property", value="some value"),
      @EndpointProperty(key = "my.other.property", 
         value="some other value"),
   })
public interface MyService {
   String echoString(String s);
}

org.apache.cxf.annotations.Policy org.apache.cxf.annotations.Policies (since 2.3)

Used to attach WS-Policy fragments to a service or operation. The Policy supports the attributes:

uri

REQUIRED the location of the file containing the Policy definition

includeInWSDL

Whether to include the policy in the generated WSDL when generating a wsdl. Default it true

placement

Specify where to place the policy

faultClass

if placement is a FAULT, this specifies which fault the policy would apply to

Note

When using a custom Spring configuration, you'll need to import META-INF/cxf/cxf-extension-policy.xml

@Policies({
   @Policy(uri = "annotationpols/TestInterfacePolicy.xml"),
   @Policy(uri = "annotationpols/TestImplPolicy.xml",
      placement = Policy.Placement.SERVICE_PORT),
   @Policy(uri = "annotationpols/TestPortTypePolicy.xml", 
      placement = Policy.Placement.PORT_TYPE)
})
@WebService
public static interface TestInterface {
   @Policies({
       @Policy(uri = "annotationpols/TestOperationPolicy.xml"),
       @Policy(uri = "annotationpols/TestOperationInputPolicy.xml", 
          placement = Policy.Placement.BINDING_OPERATION_INPUT),
       @Policy(uri = "annotationpols/TestOperationOutputPolicy.xml", 
          placement = Policy.Placement.BINDING_OPERATION_OUTPUT),
       @Policy(uri = "annotationpols/TestOperationPTPolicy.xml", 
          placement = Policy.Placement.PORT_TYPE_OPERATION),
       @Policy(uri = "annotationpols/TestOperationPTInputPolicy.xml", 
          placement = Policy.Placement.PORT_TYPE_OPERATION_INPUT),
       @Policy(uri = "annotationpols/TestOperationPTOutputPolicy.xml", 
          placement = Policy.Placement.PORT_TYPE_OPERATION_OUTPUT)
   })
   int echoInt(int i);
}

org.apache.cxf.annotations.UseAsyncMethod (since 2.6.0)

Used on the JAX-WS service implementation object to mark a method as preferring the 'async' version of the method instead of the synchronous version. With JAX-WS, services default to the synchronous methods that require the returning value to be returned from the method. By marking a method with the @UseAsyncMethod annotation, if the transport supports it, CXF will call the async version that takes an AsynHandler object and the service can call that handler when the response is ready. If the transport does not support the CXF continuations, the synchronous method will be called as normal.