JMS Support

CXF has been designed such that multiple transports can be supported for a given endpoint. If you would like your JAXRS endpoint be capable of serving not only HTTP but also JMS requests then you need to specify a JMS transportId, example :

<jaxrs:server serviceName="s:BookService" transportId="http://cxf.apache.org/transports/jms" address="/">
 <jaxrs:serviceBeans>
   <bean class="org.apache.cxf.systest.jaxrs.JMSBookStore"/>
 </jaxrs:serviceBeans>
</jaxrs:server>


Additionally, JMS queue or topic configuration needs to be done, for example, please see this beans.xml. Please note how a serviceName attribute is used to specify a service QName for a jaxrs endpoint (default is {http://reverse.package.name}ServiceClassName), this service name is 

used to configure a jms destination.

Here is the actual test. 

Here are JMS properties which can help with matching a required method on the JAXRS endpoint :

	"Content-Type" : default is "text/xml"
	"Accept" : default is "/"
	"OnewayMessage" : default is "false"
	"org.apache.cxf.message.Message.REQUEST_URI" : default is "/"
	"org.apache.cxf.message.Message.HTTP_REQUEST_METHOD" : default is "POST"



If JMS messages are sent to topic destinations then one has to either set a "OnewayMessage" property or ensure that target JAXRS methods are annotated with org.apache.cxf.jaxrs.ext.Oneway. 

As far as REQUEST_URI is concerned, it is initially matched against a jaxrs:server/@address. So if REQUEST_URI is not set or set to "/" then jaxrs:server/@address has to be set to "/". If REQUEST_URI is set to "/bar/foo" and

jaxrs:server/@address is set to "/bar" then it will be '/foo' which will be used to find a root resource class and its method.

By referencing a bean such as 'org.apache.cxf.systest.jaxrs.JMSBookStore' from multiple jaxrs endpoints you can ensure that both HTTP and JMS requests are handled by the same service bean. In such cases you may want to use a CXF JAXRS specific ProtocolHeaders context which will let you get either HTTP or JMS headers. 

Oneway invocations

Resource methods with an org.apache.cxf.jaxrs.ext.Oneway annotation will be invoked oneway with the original request returning 202 HTTP status. HTTP or JMS clients can also add a "OnewayRequest" header if adding Oneway annotations is not an option.


RESTful services without annotations 

One of the latest CXF JAX-RS extensions allows users to provide external models with the information which the runtime typically gets from JAX-RS annotations like @Path, @PathParam, @Consumes, @Produces, etc.

There might be a number of cases when it can be advantageous to describe how a given resource can be exposed as a RESTful service without actually modifying this resource. For example, when new dynamic interface implementations are registered, when no source code can be modified, when the cost of future updates (for ex, modifying the value of @Path annotations) is considered to be expensive, etc.

User model schema type is described in the jaxrs.xsd. 

The top-level 'model' element can have 'resource' children elements. A 'resource' element describes a resource class which can be either a root resource class or a sub-resource one and it can have attributes describing 'path', 'produces' and 'consumes' values and it has a 'name' attribute which identifies a fully-qualified resource class. 

A 'resource' element can have a number of 'operation' elements pointing to resource methods (with its 'name' attribute) and can have 'path', 'produces', 'consumes' and 'verb' (HTTP method) values. An 'operation' element which has no 'verb' attribute is treated as a sub-resource locator - a corresponding resource class has to be available in the model with its 'name' attribute matching the return type's name of this operation.

Every operation can have a number of 'param' elements. A 'param' element should have its 'name' attribute matching a corresponding parameter name in the class resource method. Its 'type' can have the following values : 'PATH', 'QUERY', 'CONTEXT', 'HEADER', 'MATRIX', 'COOKIE', 'FORM' or 'REQUEST_BODY'. Parameters corresponding to response types do not have to be described. It can also have 'defaultValue' and 'encoded' values being set.

Starting from CXF 2.3.2-SNAPSHOT a "oneway" attribute can also be applied to individual operations.

Here is an example :


<model xmlns="http://cxf.apache.org/jaxrs">
  <resource name="org.apache.cxf.systest.jaxrs.BookStoreNoAnnotations" path="bookstore"
    produces="application/json" consumes="application/json">
    <operation name="getBook" verb="GET" path="/books/{id}" produces="application/xml">
       <param name="id" type="PATH"/>
    </operation>
    <operation name="getBookChapter" path="/books/{id}/chapter">
       <param name="id" type="PATH"/>
    </operation>
    <operation name="updateBook" verb="PUT">
       <param name="book" type="REQUEST_BODY"/>
    </operation>
  </resource>
  <resource name="org.apache.cxf.systest.jaxrs.ChapterNoAnnotations">
    <operation name="getItself" verb="GET"/>
    <operation name="updateChapter" verb="PUT" consumes="application/xml">
        <param name="content" type="REQUEST_BODY"/>
    </operation>
  </resource>
</model>



This model describes two resources, BookStoreNoAnnotations and ChapterNoAnnotations. The BookStoreNoAnnotations resource has three resource operations, 'getBook', 'getBookChapter' and 'updateBook'. Note that the 'getBookChapter' operation element (described in the model) has no 'verb' attribute so runtime will identify it as a subresource locator.

The runtime will introspect the org.apache.cxf.systest.jaxrs.BookStoreNoAnnotations class and check the return types for both 'getBook' and 'getBookChapter' methods.  BookStoreNoAnnotations.getBookChapter() method's return type is org.apache.cxf.systest.jaxrs.ChapterNoAnnotations so the model will be checked if it contains the resource element with the 'name' attribute equal to 'org.apache.cxf.systest.jaxrs.ChapterNoAnnotations'. After this resource has been found, the  ChapterNoAnnotations class is recognized as a sub-resource and then its 'getItself' method is checked.  

Additionally the BookStoreNoAnnotations resource declares that all its resource methods produce 'application/json' mediaTypes, while its 'getBook' method overrides its with its own 'produces' value. BookStoreNoAnnotations resource also has a 'consumes' attribute which requires all of the resource methods (such as 'updateBook') to consume "application/json" formats. The ChapterNoAnnotations 'updateChapter' resource operation requires 'application/xml' formats.

You can use a comma-seperated list of media type values if needed, for example, produces("application/xml;charset=utf-8,application/json") or consumes("application/xml;charset=utf-8,application/json").

Please also see this model file for an example. Providing this file will let all implementations of the interface described in this model instance be exposed as RESTful services supported by the JAX-RS runtime. 

Configuration 

A user model can be referenced in a number of ways. It can be embedded in a jaxrs:server endpoint definition or linked to through a jaxrs:server modelRef attribute as a classpath resource. 

Please see this bean Spring configuration file, look at jaxrs server beans with 'bookservice6' and 'bookservice7' names.

Note that when registering a model from Spring you do not need to declare a jaxrs server serviceBeans section - the runtime will instantiate the beans itself. If you do need to inject certain properties into your service bean from Spring then you do need to declare a service bean too. In this case this bean will be instantiated twice - once by the runtime during the model introspection and once by Spring, however in the end it will be the bean created by Spring that will be used, the one created by the runtime will be removed.

You can avoid this double instantiation by having your model describing the interfaces which the actual root resource beans will implement. In this case only Spring will create a bean and the runtime will apply the model description to this injected bean. Note that if Spring proxifies your bean (for example by applying transaction aspects to it) then the model does have to describe an interface for a match between the model and the injected bean proxy to succeed.

Please have a look at this Spring bean. The jaxrs endpoint with id 'bookservice2' will have BookStoreWithNoAnnotations created twice but it will be the Spring created BookStoreWithNoAnnotations bean that will serve as a resource class instance. The jaxrs endpoint with id 'bookservice3' will have BookStoreWithNoAnnotationsImpl class instantiated only by Spring, with the model describing BookStoreWithNoAnnotationsInterface only that this class implements.


You can also register a model programmatically, for example :


JAXRSServerFactoryBean sf = new JAXRSServerFactoryBean();
            sf.setAddress("http://localhost:9080/");
String modelRef = "classpath:/org/apache/cxf/systest/jaxrs/resources/resources2.xml";
sf.setModelRef(modelRef);

// or if you have interface classes described in the model already loaded, ex : OSGI
// sf.setModelRefWithServiceClass(modelRef, BookStoreNoAnnotationsInterface.class);

// register an actual bean only if the model describes interfaces
sf.setServiceBeans(new BookStoreNoAnnotationsImpl());



Please also see this system test for the example of how model beans like UserResource can be created and registered programmatically.

Similarly, you can register a user model on the client side, either from jaxrs:client or programmatically, example :


JAXRSClientFactoryBean cf = new JAXRSClientFactoryBean();
cf.setAddress("http://localhost:9080/");
String modelRef = "classpath:/org/apache/cxf/systest/jaxrs/resources/resources2.xml";
sf.setModelRef(modelRef);
BookStoreNoAnnotations proxy = cf.create(BookStoreNoAnnotations.class);



At the moment it is only possible to register a user model with CXFNonSpringJAXRSServlet using the latest 2.2.3-SNAPSHOT like the way it is done in this web.xml. See CXFServlet3 and CXFServlet4 servlet declarations. Note that CXFServlet4 registers a model containing interfaces so it also registers a BookStoreNoAnnotationsImpl service class.

The workaround is to create a custom servlet :


public class JAXRSUserModelServlet extends CXFNonSpringJaxrsServlet  {

@Override
public void loadBus(ServletConfig servletConfig) throws ServletException {

super.loadBus(servletConfig);

JAXRSServerFactoryBean sf = new JAXRSServerFactoryBean();
String address = servletConfig.getInitParameter(SERVICE_ADDRESS_PARAM); //jaxrs.address
if (address == null) {
address = "/";
}
sf.setAddress(address);

// modelRef needs to start from 'classpath:', ex 'classpath:/WEB-INF/models/model1.xml
String modelRef = servletConfig.getInitParameter("user.model");
sf.setModelRef(modelRef);
sf.create();
}

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[CONF] Apache CXF Documentation > JAX-RS Advanced Features

JAX-RS Advanced Features

Page added by Sergey Beryozkin

JMS Support

Oneway invocations

RESTful services without annotations

Configuration

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