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Distinguish Between Stateful and Stateless Session Beans
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via the EJBs return object. It is not possible to maintain a reference to an input argument of an EJB, change that argument s values inside of the EJB, and then have access to those changes at the client.
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Calling Session Bean Methods from a Client After all the components of a session bean have been created and a remote reference to the EJB is made available to a client, the exposed business methods of the EJBObject and the life cycle methods of the EJBHome are available to the client as if the EJB were local to that client. Coding Clients to Call EJBs After the session bean reference has been made available to a client, it is up to the client to instantiate the bean components through the bean s home interface. Only then can the business logic methods of the bean class be accessed via the exposed methods of the EJBObject. For Java Platform EE applications to run in an efficient and stable fashion, both client and server developers should adhere to standard programming policy practices and procedures, two of which are mentioned next. Session Beans, Reentrance, and Loop-Back Calls If a bean is allowed to invoke methods on itself or another bean that invokes methods on the initial bean, the initial bean is said to be reentrant. This type of self-accessing call is referred to as a loop-back call. As opposed to an entity bean, a session bean is never allowed to be reentrant. If a session bean attempts to make a loop-back, the EJB container should throw a java.rmi.RemoteException. Remove the Bean When Done When a client no longer has use for a session bean, it should remove the session object using the javax.ejb.EJBObject. remove() method or the javax.ejb.EJBHome.remove(Handle handle) method. If the javax.ejb.EJBHome.remove(Object primaryKey) method is called on a session by mistake, the javax.ejb.RemoveException will be thrown because session beans, unlike entity beans, do not have a primary key.
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The EJB framework allows many different types of clients to instantiate EJBs and takes advantage of the business logic that they implement. For the rest of this section, examples of different types of clients calling a session bean will be presented along with some of the necessary tasks that must be completed to support these different clients. This section concentrates on how clients can be integrated with EJBs.
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7: Enterprise JavaBeans and the EJB Container Model
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Servlets Calling Session Beans A servlet is a Java program that runs within a Web or application server and implements the javax.servlet.Servlet interface. Servlets are designed to receive and respond to requests from Internet clients or browsers. The standard protocols used for communication between a browser and a servlet are usually Hypertext Transfer Protocol (HTTP) or secure Hypertext Transfer Protocol (HTTPS). Servlets receive and respond to requests from Internet clients using methods defined by the javax.servlet.Servlet interface. After the web or application server constructs the servlet, the servlet gets initialized by the life cycle method init().
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EXERCISE 7-2 Review Code for a Stateful Session Bean (Prior to EJB 3.0)
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To become more familiar with developing and coding, let s review the code for a stateful session bean. Your code should look something like the code shown next. Again, we use a step-wise approach that covers all the steps required to create, package, deploy, and call the bean.
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1. Create the Stateful Session Bean Class Following is an example of a stateful session bean class. The purpose of this bean is to create and initialize a counter and have a business method increment the counter. The in-line documentation points out the required methods along with the business methods.
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package javaee.architect.SFSession; import javax.ejb.*; // A stateful session bean. // When bean is created a counter is initialized with the // parameter value. A business method increments the counter. public class SFSessionBean implements SessionBean { private SessionContext sessionContext; // The counter. private int ctr; // Bean's methods required by EJB specification public void ejbCreate(int parm) throws CreateException { this.ctr = parm; log("ejbCreate("+parm+")"); } public void ejbRemove() { log("ejbRemove() ctr="+ctr); }
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