java barcode generator library Methods in the session bean remote interface in Java

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Methods in the session bean remote interface
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7: Enterprise JavaBeans and the EJB Container Model
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The home interface is implemented in a container through an object called the home object. The container makes visible an instance of the home object to clients that want to instantiate a session bean. In addition to create() methods that are to be defined in the home interface, the methods listed here and shown in Figure 7-4 are to be contained in the home interface:
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n getEJBMetaData()
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This method is used to obtain the EJBMetaData interface of an EJB. EJB deployment tools are responsible for implementing classes that provide metadata to the remote client. The EJBMetaData interface enables the client to get information about the enterprise bean. This metadata may be used to give access to the enterprise bean clients that use a scripting language to access these enterprise beans. Development tools may also use this metadata. The EJBMetaData interface is not a remote interface, so its class must be serializable.
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n getHomeHandle()
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This method is used to obtain a handle of a home object. The EJB specification allows a client to obtain a handle for the remote home interface. The client can use the home handle to store a reference to an entity bean s remote home interface in stable storage and recreate the reference later. This handle functionality may be useful to a client who needs to use the remote home interface in the future but does not know the JNDI name of the remote home interface. This method is used to remove EJBObjects that are identified by their handles. A handle may be retrieved by using the getHandle() method. This method should not be used for session beans. It is used to remove EJBObjects that are identified by their primary key. Because session objects do not have primary keys that are accessible to clients, invoking this method on a session bean will result in a RemoveException. A container may also remove the session object automatically when the session object s lifetime expires.
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n remove(Handle h)
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n remove(Object primaryKey)
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Since all session objects keep their identity anonymous, finder() methods for session beans should not be defined. The finder() methods for entity beans are covered later on in this chapter, in the section Home Interfaces and finder( ) Methods.
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Distinguish Between Stateful and Stateless Session Beans
FIGURE 7-4
Methods in the session bean home interface
Again, note that the methods in the preceding list are included automatically by virtue of inheritance. Here is an example of a home interface definition for an EJB:
import javax.ejb.*; import java.rmi.*; public interface AccountRemoteHome extends EJBHome { Account create() throws CreateException, RemoteException; }
Session Bean Class Methods (Prior to EJB 3.0)
Session bean classes are used as the molds for instantiating session bean instances. These instances are indirectly called as local and remote clients via home and remote interfaces. EJBCreate() methods correspond with the create() methods of the session bean s home interface and are used for initializing the session bean s instance. The business methods created in a session bean class are a superset of those defined for the session bean s local or remote interface. These business methods implement the core business logic for session beans.
create() Methods (Prior to EJB 3.0) The EJB specification requires the session bean class to contain one or more ejbCreate() methods. These ejbCreate() methods are normally used to initialize the bean.
7: Enterprise JavaBeans and the EJB Container Model
As many ejbCreate() methods as necessary may be added to the bean (only one ejbCreate() method for stateless session beans, however), as long as their signatures meet the following requirements:
n They must have a public access control modifier. n They must have a return type of void. n They must have RMI compliant arguments, in that they are serializable
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