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This concludes our discussion of invoking a web service from an EJB. You ve now seen how to expose your web service for potential clients to consume, as well as how to access other web services on the network regardless of what technology was used to develop them. The new JAX-WS 2.0 annotations make defining and working with web services significantly easier than previous web service standards. Next we ll discuss some best practices you can use to build web services that maximize their interoperability opportunities.
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15.5 Best practices for web service development
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In this section we outline some of the best practices for building web services. Determine whether you really need your application to be exposed as a web service and that your application requires interoperability. If not, then consider using alternative technologies and protocols because you will most likely find better performance in using alternative protocols such as RMI. Regardless of the technology used, at this
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point in the SOAP web service paradigm, messing around with all that XML can put a real strain on your network. Options for sending binary web service messages are just now emerging, but they are still a few years away from being widely available. So the first recommendation is for you not to expose all your EJBs as web services. In addition, whenever considering methods to expose, only expose coarse-grained EJBs as web services. Either build a service endpoint interface for your EJB, or use the @WebMethod annotation to limit the methods exposed in the web service. Analyze whether you need RPC-oriented or document-oriented web services. You can use the @SOAPBinding annotation to control the style for your EJB web service. RPC-style web services may perform better than document style web services. However, document style web services provide more flexibility because you can use XML schemas to define the messages. Similarly, avoid using message encoding because it makes your services less interoperable, as well as less portable between SOAP implementations. Document/literal is the recommended combination for an interoperable web service. Design your EJB web service so that it creates very minimal network traffic. Avoid sending large objects over the wire. It s better to send an Id or reference to an object instead of sending the entire object. All objects sent via SOAP are serialized into XML. The XML representation of data can be quite large, making SOAP messages much more expensive than retrieving the object in the target location. In addition, if your EJB involves a long-running transaction, avoid exposing it as a web service, or mark it as not returning a value so that it can be invoked in a more asynchronous manner. Use JAX-WS data types as the method parameters for your web service to give it interoperability with heterogeneous web services. Suppose you have an object graph involving Collections, HashMaps, and Lists as web service parameters. Using these data types in the WSDL makes your application less interoperable. Test your applications to make sure they comply with the WS-I Basic Profile if interoperability is important for your application. There are several mechanisms to secure your web services. You must weigh your security requirements against performance, because security comes with a high cost. The performance costs of end-to-end security are commonly higher than the initial perceived costs. This is true in general of system/application security, but even more so with regard to web services that are designed to be shared with unknown client applications.
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In this chapter you learned how to expose a stateless session bean as a web service. First, we walked through a brief review of web service components and approaches to web service development. You saw that web service metadata greatly simplifies the development of EJB 3 web services by turning an EJB into a web service using one annotation: @WebService. JAX-WS 2.0 compliant containers dynamically generate endpoint interfaces, WSDL, and mapping files, and don t require that you perform the mundane task of packaging several deployment descriptors and mapping files. You saw that different annotations supported by web services metadata can be used for controlling specific elements of the WSDL. It s also possible to use an existing WSDL with an EJB 3 web service. EJB 3 web services provide several benefits compared with regular Java class web services, although there is hardly any difference in coding style. Your EJB application may require invoking a web service, and you can use either a SEI or service interface via the @WebServiceRef annotation. Finally, we reviewed some best practices in using EJB 3 with web services. Following these guidelines can make your web services more interoperable and better performing.
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