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Local interfaces don t require any special measures in terms of either defining or implementing them. Remote interface Clients residing outside the EJB container s JVM instance must use some kind of remote interface. If the client is also written in Java, the most logical and resourceefficient choice for remote EJB access is Java Remote Method Invocation (RMI). In case you are unfamiliar with RMI, we provide a brief introduction to RMI in appendix A. For now, all you need to know is that it is a highly efficient, TCP/IPbased remote communication API that automates most of the work needed for calling a method on a Java object across a network. EJB 3 enables a stateless bean to be made accessible via RMI through the @Remote annotation. The BidManager business interface in our example uses the annotation to make the bean remotely accessible:

@Remote public interface BidManager extends Remote { ... }

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A remote business interface may extend java.rmi.Remote as we ve done here, although this is optional. Typically the container will perform byte-code enhancements during deployment to extend java.rmi.Remote if your bean interface does not extend it. Remote business interface methods are not required to throw java.rmi.RemoteException unless the business interface extends the java.rmi. Remote interface. Remote business interfaces do have one special requirement: all parameters and return types of interface methods must be Serializable. This is because only Serializable objects can be sent across the network using RMI. Web service endpoint interface The third type of interface is specific to stateless session beans that you haven t seen yet: the web service endpoint interface (also known as SEI). The ability to expose a stateless session bean as a SOAP-based web service is one of the most powerful features of EJB 3. All you need to do to make a bean SOAP accessible is mark a

The turnkey security assertions are a set of core strategies that allow software developers to easily secure a Web service. We present a brief definition of each one of them; most of them will be covered in detail later in this chapter and also in 7. UsernameOverTransportSecurity: This strategy can be used when there is an existing secure channel, such as the one provided by SSL. The Web service client will send a Username Token to the server as a way to prove its identity. The server will be responsible for the validation of the token information, which contains the username and password. Upon successful validation of the credentials, the server might check whether the user is authorized to access the requested resources. In this scenario the client and the server trust each other enough to share a secret that will be used for authentication. This shared secret is the user s password that is received by the server and validated against a local database, a legacy application, LDAP or Active Directory. ,

business interface with the @javax.jws.WebService annotation. The following defines a simple web service endpoint interface for the BidManagerBean: