Apache CXF Web Service Development Naveen Balani Rajeev Hathi Chapter No. 2 "Developing a Web Service with CXF" In this package, you will find: A. Web Service define a standard way of integrating systems using XML, SOAP, WSDL and UDDI open Apache CXF is an open source services framework. Chapter 5 – Apache CXF and Tomcat Server Figure Deployment diagram for CXF Web Service application and Oracle WebLogic server . Write a simple Web Service application using Java Development Kit (JDK) 6 or later. 5.
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Apache CXF Web Service DevelopmentDevelop and deploy SOAP and RESTful Web ServicesNaveen Balani Rajeev HathiBIRMI. Apache CXF Web Service Development Develop and deploy SOAP and Developing Web Services with Apache CXF and Axis2 5 Foreword Learn web serv. JAX-WS , JAX-RS , (TCK tests). ▫ Basic support: WS-I Basic Profile. ▫ Metadata: WS-Policy, WSDL ▫ Messaging: WS-Addressing, SOAP /
It will typically involve three steps: I owe thanks and gratitude to my family members who have supported and encouraged my writing efforts day and night. The port name signifies the endpoint name. Whenever an error condition arises, a handlefault method is invoked on each interceptor, and the chain unwinds or moves backwards. Developing web service client code We will now create a standalone Java class to invoke our OrderProcess web service. ContextLoader - Context initialization failed org.
Apache CXF framework helps you to develop a standards-based programming model and also provides a flexible deployment model for deploying web services. However, getting started with developing web services using the Apache CXF framework is not easy. It is a hands-on practical guide that simplifies working with CXF framework as it covers all major aspects with real-world examples. The chapters cover the various CXF features in detail and each has systematic steps with practical, simple examples to implement these features on your web services.
The book covers both code-first and contract-first approaches for service deployment. You will see how to develop services in a flexible deployment model offered by CXF, unit test them in a stand-alone environment, and finally promote them in an application server environment. The instructions in this book will help developers to build their application according their requirements by using any of the frontends supported by Apache CXF framework.
NET web service. These tools are standard batch files that can be easily executed from the Windows command shell by following the instructions in the book. He has over 9 years of industrial experience and has architected and implemented large scale BPM solutions. He started working with Web Services way back in and proposed the first MVC web services-based pattern http: Rajeev Hathi is a senior technology consultant specializing in J2EE architecture and design.
He has more that 10 years of industry experience in the area of design and development of J2EE-based projects. His hobbies are music and sports.
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This course flattens the learning curve with practical examples to take you from novice to expert in easy steps. Are you sure you want to claim this product using a token? Naveen Balani, Rajeev Hathi December Quick links: What do I get with a Packt subscription?
What do I get with an eBook? What do I get with a Video? Frequently bought together. Learn more Add to cart. Groovy for Domain-specific Languages - Second Edition. Paperback pages. Book Description Apache CXF framework helps you to develop a standards-based programming model and also provides a flexible deployment model for deploying web services.
Table of Contents Chapter 1: Getting Familiar with CXF. Chapter 2: Chapter 3: Working with CXF Frontends. A developer need not have to write any Java class to publish a web service. Developing a client In the previous section we discussed and illustrated how to develop and publish a web service. We now have the server-side code that publishes our OrderProcess web service. The next set of tasks will be to create the client-side code that will consume or invoke our OrderProcess web service.
To achieve this, we will perform the following steps: Develop the client-beans. The following code illustrates the client-beans. The bean will represent an SEI. In this case the endpoint is published at the URL address: The client application will make use of this SEI to invoke the web service. Developing web service client code We will now create a standalone Java class to invoke our OrderProcess web service. The following code illustrates the client invocation of a web service method: The context component's getbean method is passed the bean ID orderclient.
Using the SEI, we then invoke the web service method processorder. One thing to observe here is that the client always uses the interface to invoke a web service method.
The processorder method takes the Order bean as a parameter. The following code depicts the Order bean: The method will then process the order and return the unique order ID. To summarize, we created the OrderProcess service endpoint interface and the implementation class. We then created server and client-side Spring-based configuration files and finally we created the client application.
The relevant components are developed and we are all set to run or execute our code. But before we do that, you will have to create one final component that will integrate Spring and CXF. We need to wire Spring and CXF through web. The following code illustrates the web. The web. It defines the listener class ContextLoaderListener, which is responsible for loading the server-side configuration file beans. So upon the web server startup, the order process web service endpoint will be registered and published.
Before running the program, we will organize the code so far developed in the appropriate folder structure. You can create the folder structure, as shown in the following screenshot, and put the components in the respective sub folders The developed code will go into the following: The Java code will go into the respective package folders The beans.
It will typically involve three steps: Building the code Deploying the code Executing the code [ 36 ]. We will use the ANT tool to do this.
The following code illustrates the sample build. Please make sure that you have set up the environment variables as mentioned in Appendix A. Open the command prompt window, go to C: It will build the code and put the class files under the newly created build folder. The following figure shows the output generated upon running the ant command.
Deployment effectively means building and moving the code archive to the server deploy path. We will be using the Tomcat web container to deploy and run the application. To deploy our built code, navigate to project root folder, and enter the following command: Executing the code Following code deployment, we are all set to run the Order Process Application. You will execute the Java client program Client.
The program will invoke the processorder method that will generate the order ID if the specified order is approved. Before running the client program, we need to start the Tomcat web server. There are several ways of starting the Tomcat server depending on the Tomcat version that is installed. Once the server is started, you need to run the client program by giving the following command at the command prompt window: Upon executing this command, it will generate the following output: Thus we have successfully executed the order processing web service.
The CXF bus is comprised of a Spring-based configuration file, namely, cxf. It defines a common context for all the endpoints. It wires all the runtime infrastructure components and provides a common application context.
It builds the application context from the following files: Now, we know that CXF internally uses Spring for its configuration. The following XML fragment shows the bus definition in the cxf. The class acts more as an interceptor provider for incoming and outgoing requests to a web service endpoint. These interceptors, once defined, are available to all the endpoints in that context. The cxf. These components are made available as bus extensions.
One can access these infrastructure objects using the getextension method. These infrastructure components are registered so as to get and update various service endpoint level parameters such as service binding, transport protocol, conduits, and so on.
CXF bus architecture can be overridden, but one must apply caution when overriding the default bus behavior. Since the bus is the core component that loads the CXF runtime, many shared objects are also loaded as part of this runtime. You want to make sure that these objects are loaded when overriding the existing bus implementation. You can extend the default bus to include your own custom components or service objects such as factory managers.
You can also add interceptors to the bus bean. These interceptors defined at the bus level are available to all the endpoints. The following code shows how to create a custom bus: You can complement or overwrite the bean definitions that the original cxf. For the CXF to load the mycxf. The following code illustrates the use of interceptors at the bus level: Frontend CXF provides the concept of frontend modeling, which lets you create web services using different frontend APIs.
It also lets you create dynamic web service clients. We will look at how to use the Frontend programming model in the next chapter. JAX-WS simplifies web service development. It defines Java-based APIs that ease the development and deployment of web services. The specification supports WS-Basic Profile 1.
It effectively means a web service can be invoked or consumed by a client written in any language. JAX-WS also speeds up web service development by providing a library of annotations to turn Plain Old Java classes into web services and specifies a detailed mapping from a service defined in WSDL to the Java classes that will implement that service.
As discussed earlier, two approaches for web service development exist: Code-First and Contract-First. With JAX-WS, you can perform web service development using one of the said approaches, depending on the nature of the application. With the Code-first approach, you start by developing a Java class and interface and annotating the same as a web service.
The approach is particularly useful where Java implementations are already available and you need to expose implementations as services. The consumer of a web service uses SEI to invoke the service functions. The SEI directly corresponds to a wsdl: The methods defined by SEI correspond to the wsdl: In the above example, annotation defined above the interface declaration signifies an interface as a web service interface or Service Endpoint Interface.
In the Contract-first approach, you start with the existing WSDL contract, and generate Java class to implement the service. The advantage is that you are sure about what to expose as a service since you define the appropriate WSDL Contract-first. Again the contract definitions can be made consistent with respect to data types so that it can be easily converted in Java objects without any portability issue.
In Chapter 3 we will look at how to develop web services using both these approaches. WSDL contains different elements that can be directly mapped to a Java class that implements the service. For example, the wsdl: It has various options to generate SEI and the implementation web service class.
As a developer, you need to provide the method implementation for the generated class. The chapter will also cover a brief discussion on the wsdl2java tool. The simple frontend provides simple components or Java classes that use reflection to build and publish web services.
It is simple because we do not use any annotation to create web services. The simple frontend uses factory components to create a service and the client. It does so by using Java reflection API. In Chapter 3 we will look at how to develop simple frontend web services The following code shows a web service created using simple frontend: Interceptors are components that intercept the messages exchanged or passed between web service clients and server components.
In CXF, this is implemented through the concept of Interceptor chains. The concept of Interceptor chaining is the core functionality of CXF runtime. Each interceptor in a chain is configurable, and the user has the ability to control its execution.
It defines two abstract methods handlemessage and handlefault. Each of the methods takes the object of type Message as a parameter. A developer implements the handlemessage to process or act upon the message. The handlefault method is implemented to handle the error condition. Interceptors are usually processed in chains with every interceptor in the chain performing some processing on the message in sequence, and the chain moves forward. Whenever an error condition arises, a handlefault method is invoked on each interceptor, and the chain unwinds or moves backwards.
Interceptors are often organized or grouped into phases. Interceptors providing common functionality can be grouped into one phase. Each phase performs specific message processing. Each phase is then added to the interceptor chain. The chain, therefore, is a list of ordered interceptor phases. The chain can be created for both inbound and outbound messages. A typical web service endpoint will have three interceptor chains: Inbound messages chain Outbound messages chain Error messages chain There are built-in interceptors such as logging, security, and so on, and the developers can also choose to create custom interceptors.
The chapter will mainly focus on Interceptors. Service model The Service model, in a true sense, models your service.
It is a framework of components that represents a service in a WSDL-like model. It provides functionality to create various WSDL elements such as operations, bindings, endpoints, schema, and so on. The following figure shows the various components that form the Service model: As you can see from the above figure, the service model's primary component is ServiceInfo which aggregates other related components that make up the complete service model.
For example, by using a simple frontend, we can create, publish, and consume web services through factory components such as ServerFactoryBean and ClientProxyFactoryBean.
These factory classes internally use the service model of CXF. Data binding Data binding is the key for any web service development. Data binding means mapping between Java objects and XML elements. As we know, with web service, messages are exchanged as XML artifacts.
So there has to be some way to convert these XML into Java objects and vice versa for the application to process as service and client. Data binding components perform this mapping for you.
As a developer, you have the choice of specifying the binding discipline through a configuration file or API. If no binding is specified, then JAXB is taken as a default binding discipline.
For example, annotation specifies that the OrderProcess class will be mapped to complex XSD element type 'processorder' that contains an element 'arg0' of type 'Order' bean. Aegis allows developers to gain control of data binding through its flexible mapping system.
You do not have to rely on annotations to devise the mapping. Some of the annotations that can be used with Aegis are: Aegis reads this XML to perform the necessary binding.
Aegis also uses reflection to derive the mapping between Java object and XML. The following code fragment shows the sample Aegis mapping file: You can configure your web service to use Aegis data binding as follows: The messages, in web service terminology, are nothing but an operation with input and output parameters.
The message defined in the web service component is called a logical message. The logical message used by a service component is mapped or bound to a physical data format used by endpoints in the physical world. It lays down rules as to how the logical messages will be mapped to an actual payload sent over the wire or network.
Port types define operations and input and output parameters which are abstract in nature. They define the logical message, whereas binding translates this logical message into actual payload data defined by the underlying protocol.
The following WSDL portion shows the sample binding details: This element has two attributes, namely, name and type. The name attribute identifies the binding, and the type attribute maps it with the port type. The name attribute of the binding element is used to associate with the endpoint. In the previous case, the communication protocol used is SOAP 1.
CXF supports the following binding protocols: SOAP 1. Transport protocols are associated with the endpoints. One endpoint can communicate with another using a specific transport protocol. Transport details are nothing but networking details.
Service endpoints are a physical representation of a service interface. Endpoints are composed of binding and networking details. The port element is a child of the service element. The WSDL portion following shows the sample transport details: The service element has one child element as port element. The port element maps to binding as defined by the binding element and provides details of the transport. In Chapter 4, the various transport protocols are explained in the context of web services development.
CXF supports the following transports for its endpoints: CXF's seamless integration with Spring makes it extremely easy and convenient to build and publish a web service. We also saw how to build, deploy, and execute a web service using ANT and Tomcat. The chapter later described the CXF architecture, which is built upon the core components. These components lay down the foundation for building web services.
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