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Yes Yes Yes Most EJB containers do not require this. No
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When this chapter was written, most Java EE containers required regular Java classes using web services metadata to run through an annotation processor before deployment. This is in contrast to EJB 3 annotations, which are dynamically processed during deployment, thus greatly simplifying the development process. This optimization is yet another reason to consider using EJB 3 for your web service implementations. Next we ll see how to expose a stateless EJB as a web service, as defined in the Web Services Metadata 2.0 specification. This isn t the only way to expose an EJB as a web service (you could use deployment descriptors), but you ll go this route if you re using the JAX-WS 2.0 approach. If you like annotations, this one s for you!
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15.3 Developing EJB web services with JAX-WS 2.0
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Using JAX-RPC web services with EJB 2.1 makes exposing a simple EJB as a web service a lot more difficult than it should be. You have to perform the following steps, typically by hand:
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Exposing EJBs as web services
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Generate the WSDL describing the service. Build a service endpoint interface (SEI) the actual service portion of the web service. Identify the endpoint interface in ejb-jar.xml. Package all of these with webservices.xml.
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If you prefer that approach, you can certainly use it every time you want to publish a new service! The good news is that EJB 3 and JAX-WS 2.0 tremendously simplify the whole process. You don t piddle around with WSDL, mapping files, or descriptors, as these are automatically generated for you during deployment. Web service metadata makes bottom-up development much simpler. Let s first see a straightforward EJB 3 example exposed as a web service, and then dive into the details of some commonly used annotations that can make defining web services even easier. Listing 15.2 shows the PlaceBid bean exposed as a web service.
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Listing 15.2 PlaceBid EJB as a web service Exposes web service @WebService(targetNamespace = "urn:ActionBazaarPlaceBidService") @SOAPBinding(style = SOAPBinding.Style.DOCUMENT) @Stateless(name = "PlaceBid") Defines binding style public class PlaceBidBean implements PlaceBid { @PersistenceContext private EntityManager em; public PlaceBidBean() { }
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@WebMethod @WebResult(name = "bidNumber") Customizes name for return parameter public Long addBid( @WebParam(name = "User") String userId, Customizes name for @WebParam(name = "Item") Long itemId, passed parameter @WebParam(name = "Price") Double bidPrice) { return persistBid(userId, itemId, bidPrice); }
private Long persistBid(String userId, Long itemId, Double bidPrice) { } }
In listing 15.2, we used the @javax.jws.WebService annotation b to expose PlaceBidBean as a web service. You can use the annotation with an endpoint interface or
Developing EJB web services with JAX-WS 2.0
the bean class itself. As in our example, if you use the @WebService annotation in the bean class the endpoint interface will be generated automatically. We ll elaborate on the details of this annotation in the next section. We specified that the web service is a document-style web service by using the @javax.jws.SOAPBinding annotation c. We used the @javax.jws.WebMethod annotation to expose the addBid method in the web service d. You can use the @javax.jws.WebResult e and @javax.jws.WebParam f annotations to control the parameter names generated in the WSDL.
NOTE
Using the @WebService annotation creates a stateless EJB to a web service. The rest of the annotations are optional.
In this section you ll learn how to use web services metadata annotations. We ll start with using the @WebService annotation to convert an EJB to a web service. You ll then see how to use the @SOAPBinding annotation to specify the web service style. You ll also learn about other annotations, such as @WebMethod, @WebParam, and @WebResult.
15.3.1 Using the @WebService annotation
The @WebService annotation is used on a bean or an interface class. If you use this annotation on the bean class, the annotation processor or the EJB container will generate the interface for you. If you already have a bean interface, then you can mark the @WebService annotation on the interface and the bean class will look like this:
@WebService public interface PlaceBidWS { public Long addBid(String bidderId, Long itemId, Double bidPrice); } @Stateless(name = "PlaceBid") public class PlaceBidBean implements PlaceBidWS, PlaceBid { ... }
If you use the @WebService annotation on the interface, then all public methods on the web service endpoint will be exposed in the web service. In our example we have only one method (addBid), and it will be exposed in the web service. A careful look at the code reveals that the @WebService endpoint interface looks similar to the remote interface. You might be tempted to mark the same interface as both a web service and a remote interface, like this:
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