Web hosting companies - EJB Fundamentals 51 networkless in that it contains
EJB Fundamentals 51 networkless in that it contains no networked logic. The remote interface is a Java interface that enumerates the business methods exposed by the enterprise bean class. In EJB, client code always goes through the remote or local interface and never interacts with the enterprise bean instance directly. The remote interface is network-aware in that the interface obeys the rules for Java RMI-IIOP. The local interface is the high-performing version of the remote interface. Use the local interface when you are calling enterprise beans that live in the same process. Your calls will not undergo stubs, skeletons, network calls, or the marshaling/demarshaling of parameters. The EJB object is the container-generated implementation of the remote interface. The EJB object is a network-aware intermediary between the client and the bean instance, handling necessary middleware issues. All client invocations go through the EJB object. The EJB object delegates calls to enterprise bean instances and implements the remote interface. The local object is the high-performing version of the EJB object. The local object implements the local interface. The home interface is a Java interface that serves as a factory for EJB objects. Client code that wants to work with EJB objects must use the home interface to retrieve them. The home interface is network-aware because clients use it across the network. The local home interface is the high-performing version of the home interface. The home object is the container-generated implementation of the home interface. The home object is also network-aware, and it obeys the RMIIIOP rules. The local home object is the high-performing version of the home object. The local home object implements the local home interface. The deployment descriptor is an XML file that specifies the middleware requirements of your bean. You use the deployment descriptor to inform the container about the implicit middleware you want, such as how to manage your bean, your bean s life cycle needs, your transactional needs, your persistence needs, and your security needs. The vendor-specific files enable you to take advantage of vendor-specific features. These files are not portable between application servers. The Ejb-jar file is the finished, complete ZIP file that contains the above files. It is the unit of deployment and is given to the application server. The application server unpacks the Ejb-jar file and loads the bean.
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