An introduction to creating Web services applications in Rational Application Developer Version 8.0

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1 An introduction to creating Web services applications in Rational Application Developer Version 8.0 September 2010 Copyright IBM Corporation

2 Overview A Web service is a set of related application functions that can be programmatically invoked over the Internet. Businesses can dynamically mix and match Web services to perform complex transactions with minimal programming. Web services allow buyers and sellers all over the world to discover each other, connect dynamically, and execute transactions in real time with minimal human interaction. Web services are self-contained, self-describing modular applications that can be published, located, and invoked across the Web. Web services are self-contained. On the client side, no additional software is required. A programming language with XML and HTTP client support is enough to get you started. On the server side, a Web server and servlet engine are required. The client and server can be implemented in different environments. It is possible to Web service enable an existing application without writing a single line of code. Web services are self-describing. The client and server need to recognize only the format and content of request and response messages. The definition of the message format travels with the message; no external metadata repositories or code generation tools are required. Web services are modular. Simple Web services can be aggregated to form more complex Web services either by using workflow techniques or by calling lower layer Web services from a Web service implementation. Web Services are platform independent. Web services are based on a concise set of open, XML-based standards designed to promote interoperability between a Web service and clients across a variety of computing platforms and programming languages. Web services might be anything, for example, theatre review articles, weather reports, credit checks, stock quotations, travel advisories, or airline travel reservation processes. Each of these self-contained business services is an application that can easily integrate with other services, from the same or different companies, to create a complete business process. This interoperability allows businesses to dynamically publish, discover, and bind a range of Web services through the Internet. Categories of Web services Web services can be grouped into three categories: Copyright IBM Corporation

3 Business information. A business shares information with consumers or other businesses. In this case, the business is using Web services to expand its scope. Examples of business informational Web services are news streams, weather reports, or stock quotations. Business integration. A business provides transactional, "for fee" services to its customers. In this case, the business becomes part of a global network of value-added suppliers that can be used to conduct commerce. Examples of business integration Web services include bid and auction e-marketplaces, reservation systems, and credit checking. Business process externalization. A business differentiates itself from its competition through the creation of a global value chain. In this case, the business uses Web services to dynamically integrate its processes. An example of business process externalization Web services is the associations between different companies to combine manufacturing, assembly, wholesale distribution, and retail sales of a particular product. Service roles and interactions A network component in a Web Services architecture can play one or more fundamental roles: service provider, service broker, and service client. Service providers create and deploy their Web services and can publish the availability of their WSDL-described services through a service registry, such as a UDDI Business Registry. Service brokers register and categorize published services and provide search services. For example, UDDI acts as a service broker for WSDL-described Web services. Service clients use broker services such as the UDDI Business Registry to discover a needed WSDL-described service and then bind to and call the service provider. Binding involves establishing all environmental prerequisites that are necessary to successfully complete the services. Examples of environmental prerequisites include security, transaction monitoring, and HTTP availability. The relationships between these roles are described in Figure 1. Copyright IBM Corporation

4 Web services standards One of the key attributes of Internet standards is that they focus on protocols and not on implementations. The Internet is composed of heterogeneous technologies that successfully interoperate through shared protocols. This prevents individual vendors from imposing a standard on the Internet. Open Source software development plays a crucial role in preserving the interoperability of vendor implementations of standards. The following standards play key roles in Web services: Universal Description, Discovery and Integration (UDDI), Web Services Description Language (WSDL), Web Services Inspection Language (WSIL), SOAP, and Web Services Interoperability (WS-I). The relationship between these standards is described in Figure 2. The UDDI specification defines open, platform-independent standards that enable businesses to share information in a global business registry, discover services on the registry, and define how they interact over the Internet. For more information on UDDI, refer to WSIL is an XML-based open specification that defines a distributed service discovery method that supplies references to service descriptions at the service provider's point-of-offering, by specifying how to inspect a Web site for available Web services. A WSIL document defines the locations on a Web site where you can look for Web service descriptions. Since WSIL focuses on distributed service discovery, the WSIL specification complements UDDI by facilitating the discovery of services that are available on Web sites that may not be listed yet in a UDDI registry. For more information on WSIL, refer to developerworks/webservices/library/ws-wsilspec.html Copyright IBM Corporation

5 WSDL is an XML-based open specification that describes the interfaces to and instances of Web services on the network. It is extensible, so endpoints can be described regardless of the message formats or network protocols that are used to communicate. Businesses can make the WSDL documents for their Web services available though UDDI, WSIL, or by broadcasting the URLs to their WSDL via or Web sites. WSDL is described as a separate topic in this documentation. For more information on WSDL, refer to SOAP is an XML-based standard for messaging over HTTP and other Internet protocols. It is a lightweight protocol for the exchange of information in a decentralized, distributed environment. It is based on XML and consists of three parts: An envelope that defines a framework for describing what is in a message and how to process it. A set of encoding rules for expressing instances of application-defined data types. A convention for representing remote procedure calls and responses. SOAP enables the binding and usage of discovered Web services by defining a message path for routing messages. SOAP may be used to query UDDI for Web services. For more information on SOAP 1.1 (SOAP 1.2 is not supported by the Web services tools), refer to Copyright IBM Corporation

6 A service provider hosts a Web service and makes it accessible using protocols such as SOAP/HTTP or SOAP/JMS. The Web service is described by a WSDL document that is stored on the provider's server or in a special repository. The WSDL document may be referenced by the UDDI business registry and WSIL documents. These contain pointers to the Web service's WSDL files. The WS-I Simple SOAP Binding Profile and WS-I Attachments Profile are outlines of requirements to which WSDL and Web service protocol (SOAP/ HTTP) traffic must comply in order to claim WS-I conformance. The Web services WS-I validation tools currently support WS-I Simple SOAP Binding Profile 1.0 and the Attachment Profile 1.0. To view the specifications, refer to the WS-I Web site, and under Resources select Documentation: Several new Web services standards are also supported by this development environment. These include: Copyright IBM Corporation

7 JAX-RPC JAX-RPC stands for Java API for XML-based RPC, also known as JSR 101. It is a specification that describes Java Application Programming Interfaces (APIs) and conventions for building Web services and Web service clients that use remote procedure calls (RPC) and XML. It standardizes the Java to WSDL and WSDL to Java mappings, and provides the core APIs for developing and deploying Web services and Web service clients on the Java platform. For more information refer to the official specifications. JSR-109 JSR-109 (Implementing Enterprise Web Services) defines the programming model and run-time architecture to deploy and look up Web services in the Java EE environment; more specifically, in the Web, EJB, and Client Application containers. One of its main goals is to ensure vendors' implementations interoperate. For more information, refer to the official specifications: JSR-109 JSR-921 WS-S These tools support the OASIS Web Services Security 1.0 standard. For more information on the various components of this standard, refer to: Web Services Security: SOAP Message Security V1.0 Web Services Security: Username Token Profile V1.0 Web Services Security: X.509 Token Profile V1.0 Web Services Description Language (WSDL) Web Services Description Language (WSDL) is a standard specification for describing networked, XML-based services. It provides a simple way for service providers to describe the basic format of requests to their systems regardless of the underlying run-time implementation. WSDL defines an XML format for describing network services as a set of endpoints that operate on messages that contain either document-oriented or procedure-oriented information. The operations and messages are first described abstractly and then bound to a concrete network protocol and message format in order to define an endpoint. Related concrete endpoints are combined into abstract endpoints (services). WSDL is extensible to allow description of endpoints and their messages, regardless of which message formats or network protocols are used to communicate. This means that interfaces are defined abstractly using XML schema and then bound to concrete representations that are appropriate for the protocol. Copyright IBM Corporation

8 WSDL allows a service provider to specify the following characteristics of a Web service: The name of the Web service and addressing information The protocol and encoding style to be used when accessing the public operations of the Web service The type information such as operations, parameters, and data types comprising the interface of the Web service WSDL documents allow developers to expose their applications as networkaccessible services on the Internet. Through UDDI and WSIL, other applications can discover WSDL documents and bind with them to execute transactions or perform other business processes. This development platform supports and encourages the development and use of WS-I compliant WSDL. Business service providers can deploy Java beans and enterprise beans as a Web service and generate a WSDL document that describes the service. They can also generate Java and enterprise bean skeletons from an existing WSDL file. A business service client can generate a Java proxy from a WSDL document, thereby providing an easy-to-use Java interface to the Web service. The Java interface hides the network communications details from the client enabling the business service provider to focus on business and process portions of the application. In addition to providing tools to create Web services, the workbench provides a WSDL editor that allows you to create WSDL files using a graphical interface, a WSDL validator that ensures that your WSDL file is semantically correct and optionally checks for WS-I compliance, and the Web Services Explorer which allows you to dynamically test Web services without requiring you to generate a proxy. Rational Application Developer supports WSDL 1.1. For more information on the WSDL specification, refer to JAX-WS Java API for XML-Based Web Services (JAX-WS), which is also known as JSR-224, is the next generation Web services programming model that extends the foundation provided by the Java API for XML-based RPC (JAX-RPC) programming model. Using JAX-WS, developing Web services and clients is simplified with greater platform independence for Java applications by the use of dynamic proxies and Java annotations. The Web services tools included in this product support JAX-WS 2.0 and 2.1. JAX-WS is a new programming model that simplifies application development Copyright IBM Corporation

9 through support of a standard, annotation-based model to develop Web Service applications and clients. The JAX-WS programming standard strategically aligns itself with the current industry trend toward a more document-centric messaging model and replaces the remote procedure call programming model as defined by JAX-RPC. Although this product still supports the JAX-RPC programming model and applications, JAX-RPC has limitations and does not support many current document-centric services. JAX-WS is the strategic programming model for developing Web services and is a required part of the Java EE 5 platform. Implementing the JAX-WS programming standard provides the following enhancements for developing Web services and clients: Better platform independence for Java applications Using JAX-WS APIs, developing Web services and clients is simplified with better platform independence for Java applications. JAX-WS takes advantage of dynamic proxies whereas JAX-RPC uses generated stubs. The dynamic proxy client invokes a Web service based on a Service Endpoint Interface (SEI) which is generated or provided. The dynamic proxy client is similar to the stub client in the JAX-RPC programming model. Although the JAX-WS dynamic proxy client and the JAX-RPC stub client are both based on the Service Endpoint Interface (SEI) that is generated from a WSDL file, there is a major difference. The dynamic proxy client is dynamically generated at run time using the Java 5 dynamic proxy functionality, while the JAX-RPC-based stub client is a nonportable Java file that is generated by tooling. Unlike the JAX-RPC stub clients, the dynamic proxy client does not require you to regenerate a stub prior to running the client on an application server for a different vendor because the generated interface does not require the specific vendor information. Refer to Chapter 4 of the JAX-WS 2.0 specification for more information on using dynamic proxy clients. Annotations JAX-WS introduces support for annotating Java classes with metadata to indicate that the Java class is a Web service. JAX-WS supports the use of annotations based on the Metadata Facility for the Java Programming Language (JSR 175) specification, the Web Services Metadata for the Java Platform (JSR 181) specification and annotations that are defined by the JAX-WS 2.0 specification. Using annotations in the Java source and in the Java class simplifies development of Web services by defining some of the additional information that is typically obtained from deployment descriptor files, WSDL files, or mapping metadata from XML and WSDL files into the source artifacts. For example, you can embed a tag in the Java source to expose the bean as a Web service. Copyright IBM Corporation

10 The tells the server runtime environment to expose all public methods on that bean as a Web service. Additional levels of granularity can be controlled by adding additional annotations on individual methods or parameters. Using annotations makes it much easier to expose Java artifacts as Web services. In addition, as artifacts are created from using some of the topdown mapping tools starting from a WSDL file, annotations are included within the source and Java classes as a way of capturing the metadata along with the source files. Invoking Web services asynchronously With JAX-WS, Web services can be called both synchronously and asynchronously. JAX-WS adds support for both a polling mechanism and callback mechanism when calling Web services asynchronously. Using a polling model, a client can issue a request, get a response object back, which is polled to determine whether the server has responded. When the server responds, the actual response is retrieved. Using the polling model, the client can continue to process other work without waiting for a response to return. Using the callback model, the client provides a callback handler to accept and process the inbound response object. Both the polling and callback models enable the client to focus on continuing to process work while providing for a more dynamic and efficient model to invoke Web services. For example, a Web service interface has methods for both synchronous and asynchronous requests. Asynchronous requests are identified in bold in the following example: Copyright IBM Corporation

11 The asynchronous invocation that uses the callback mechanism requires an additional input by the client programmer. The callback handler is an object that contains the application code that will be executed when an asynchronous response is received. The following is a code example for an asynchronous callback handler: The following is a code example for an asynchronous polling client: Copyright IBM Corporation

12 Data binding with JAXB 2.0 and 2.1 JAX-WS leverages the JAXB API and tools as the binding technology for mappings between Java objects and XML documents. JAX-WS tooling relies on JAXB tooling for default data binding for two-way mappings between Java objects and XML documents. JAXB data binding replaces the data binding described by the JAX-RPC specification. WebSphere Application Server Version 7.0 supports the JAXB 2.1 specification. JAX-WS 2.1 requires JAXB 2.1 for data binding. JAXB 2.1 provides enhancements such as improved compilation support and support for annotation, and full schema 1.0 support. Dynamic and static clients The dynamic client programming API for JAX-WS is called the dispatch client (javax.xml.ws.dispatch). The dispatch client is an XML messaging oriented client. The data is sent in either PAYLOAD or MESSAGE mode. When using the PAYLOAD mode, the dispatch client is only responsible for providing the contents of the <soap:body> element and JAX-WS adds the <soap:envelope> and <soap:header> elements. When using the MESSAGE mode, the dispatch client is responsible for providing the entire SOAP envelope including the <soap:envelope>, <soap:header>, and <soap:body> elements and JAX-WS does not add anything additional to the message. The dispatch client supports asynchronous invocations using a callback or polling mechanism. </ soap:body></soap:header></soap:envelope></soap:header></ soap:envelope></soap:body> The static client programming model for JAX-WS is the called the proxy client. The proxy client invokes a Web service based on a Service Endpoint interface (SEI) which is generated or provided. Copyright IBM Corporation

13 MTOM support Using JAX-WS, you can send binary attachments such as images or files along with Web services requests. JAX-WS adds support for optimized transmission of binary data as specified by Message Transmission Optimization Mechanism (MTOM). Multiple payload structures JAX-WS exposes the following binding technologies to the user: XML Source, SOAP Attachments API for Java (SAAJ) 1.3, and Java Architecture for XML Binding (JAXB) 2.0. XML Source enables a user to pass a javax.xml.transform.source into the runtime which represents the data in a Source object to be passed to the runtime. SAAJ 1.3 now has the ability to pass an entire SOAP document across the interface rather than just the payload itself. This is done by the client passing the SAAJ SOAPMessage object across the interface. JAX-WS leverages the JAXB 2.0 support as the data binding technology of choice between Java and XML. SOAP 1.2 support Support for SOAP 1.2 was added to JAX-WS 2.0. JAX-WS supports both SOAP 1.1 and SOAP 1.2. SOAP 1.2 provides a more specific definition of the SOAP processing model, which removes many of the ambiguities that sometimes led to interoperability problems in the absence of the Web Services-Interoperability (WS-I) profiles. SOAP 1.2 should reduce the chances of interoperability issues with SOAP 1.2 implementations between different vendors. It is not interoperable with earlier versions. JAX-WS When a JAX-WS Web service is created from a Java class, the class's public methods are exposed as operations and become part of the Web service's WSDL contract. The mapping between these methods and operations is governed mainly by JSR-181 and JSR-250. With these rules, a public method in a Java class and its hierarchy up to but excluding java.lang.object are exposed when the following conditions are true: The method is annotated and the containing class has annotation The method has annotation but the containing class has annotation and no other methods are annotated JAX-WS alters the rules for how a Java class's methods are exposed on the Web service interface. Now, a public method in a Java class and its hierarchy up to but excluding java.lang.object are exposed when the following Copyright IBM Corporation

14 conditions are true: The method has annotation. The method has annotation but the containing class has annotation. Example: Before JAX-WS 2.1.6, the only exposed method would be public void exposed (String s). In JAX-WS and later the following methods will be exposed: WebSphere Application Server will be picking up these changes in version through IBM JDK 6 SR6. To enable the workbench to provide guidance on using JAX-WS 2.1.6, go to Window > Preferences > General > Service policies > WebSphere Programming Models > JAX-WS and set the JAX-WS method exposure guidance setting to true. For more information on JAX-WS, refer to the official JSR-224 specification: JSR 224: Java API for XML-Based Web Services (JAX-WS) 2.0 Tools for Web services development Rational Application Developer provides a set of tools to assist with the following aspects of Web services development: Copyright IBM Corporation

15 Discover. Browse the UDDI Business Registries or WSIL documents to locate existing Web services for integration. Create or Transform. Create bottom-up Web services from existing artifacts, such as Java beans and enterprise beans. Create top-down Web services from WSDL discovered from others or created using the WSDL Editor. Build. Wrap existing artifacts as SOAP accessible services and describe them in WSDL. The Web services wizards assist you in generating a Java client proxy to Web services described in WSDL and in generating Java bean skeletons from WSDL. Deploy. Deploy Web services into a variety of test environments. Test. Test Web services running locally or remotely in order to get instant feedback. Develop. Generate sample applications to assist you in creating your own Web service client application. Publish. Publish Web services to a UDDI v2 or v3 Business Registry, advertising your Web services so that other businesses and clients can access them. Services view The Services view within the Java EE and Web perspectives of Rational Application Developer allows Web services developers to quickly access a variety of tools which simplify Web services development. Although these tasks can also be performed in the Enterprise Explorer view, the Services view only shows the Web services and clients making it easier to find what you are looking for. The JAX-WS tools you can launch from the Services view include the following: WSDL interface editor You can launch the WSDL file for your Web service or client in the WSDL editor in order to view or edit it. This is available for both static WSDL files in your workspace, and dynamic WSDL files generated by the runtime. Note that dynamic WSDL files cannot be edited. Deployment descriptor editors If your Web service or client has deployment descriptors available, you can launch the Deployment Descriptor Editor to edit the webservices.xml file. Generate deployment descriptors If you have not previously generated a deployment descriptor, you can do so Copyright IBM Corporation

16 from this view. Although deployment descriptors are not required for JAX-WS Web services because the runtime can generate this information on the fly, by generating deployment descriptors into your workspace you can customize the deployment settings. Generate a Web service or client Depending on the object selected, you may be able to generate a top-down or bottom-up Web service, or a Web service client. Test with the Web Services Explorer You can test the function of your Web service based on either a static or dynamic WSDL file using the Web Services Explorer. Manage the policy sets for the Web service or client You can apply and edit WebSphere policy sets which regulate the qualities of service for your Web services and clients. Configure JAX-WS Web service handlers This launches the JAX-WS Service Handlers Configuration wizard, which enabled you to add or edit handlers for your JAX-WS Web service. Create router modules This option is available for EJB Web services. The Create Router Modules wizard enables a set of Web services within an Enterprise Application Archive (EAR) file. For each Web service-enabled EJB JAR in the EAR file, it adds an HTTP router, a JMS router, or both to the EAR. Each router module provides a Web service endpoint for a particular transport. Web services runtime environments Rational Application Developer supports the following runtime environments Web service generation: IBM WebSphere JAX-WS runtime environment IBM WebSphere JAX-RPC runtime environment Apache Axis 1.4 runtime environment The IBM WebSphere JAX-WS runtime environment is the strategic Web services runtime supported by IBM. The IBM WebSphere JAX-RPC runtime is a legacy environment which is still supported, however new applications should use JAX-WS whenever possible. The Apache Axis 1.4 runtime is an open source runtime supported by the tools, however it is not recommended for use in a production environment. Copyright IBM Corporation

17 For more information To learn more about Web Services and Rational Application Developer, see these resources: Rational Application Developer Web site: Rational Application Developer Information Center: Rational Application Developer wiki: https://www.ibm.com/developerworks/wikis/display/rad/home Copyright IBM Corporation

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