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n They must not have a static or void modifier.
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Several exceptions may be thrown including the javax.ejb.CreateException and other application-specific exceptions. The ejbCreate() method will usually throw a CreateException if an input parameter is not valid. When a client invokes a create() method of a home interface, the ejbCreate() method of the session bean is called and the session bean and EJBObject are instantiated. After the session bean and EJBObject have been instantiated, the create() method returns a remote object reference of the EJBObject instance associated with the session bean instance to the client. The client can then invoke all of the business methods of this reference. Because the ejbCreate() method is able to throw both javax.ejb.CreateException when there is a problem creating an object and the javax.ejb.EJBException when there is a system problem, the create() methods must be declared to throw both of these exceptions as well. In addition to the two aforementioned exceptions, the create() method must also throw any programmer-defined applications exception that may be thrown in the ejbCreate() method.
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Business Methods The primary purpose of a session bean is to execute business methods that implement business logic for use by a client. The create() (prior to EJB 3.0) or the EJBContext lookup() (EJB 3.0) methods return object references from which clients may invoke business methods. To the client, these business methods appear to be running locally; however, they actually run remotely in the session bean container. Session bean business methods, like any other Java method, are defined with the following procedures:
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n Add a method to the bean. n Write and then save the code. n Debug the code. n Finish the bean.
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Distinguish Between Stateful and Stateless Session Beans
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It is important to note that the bean class should not implement the remote interface. The bean class code is where all of the actual business code exists. This code is not supposed to be called without a proxy; therefore, it cannot be viewed directly by the client.
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EXERCISE 7-1 Review Code for a Stateless Session Bean (Prior to EJB 3.0)
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In the following exercise, the classes and interfaces are provided for a stateless session bean. The exercise is presented step-wise in the order that the classes and interfaces would be created. Your completed code should look something like the code contained in the following sections.
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1. Create the Stateless Session Bean Class Here is an example of a stateless session bean class. As you will see, the only purpose of this bean is to pass back a simple message to the caller. The inline documentation points out the required methods along with the business methods.
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package javaee.architect.SLSession; import javax.ejb.*; // A stateless session bean. public class SLSessionBean implements SessionBean { SessionContext sessionContext; // Bean's methods required by EJB specification. public void ejbCreate() throws CreateException { log("ejbCreate()"); } public void ejbRemove() { log("ejbRemove()"); } public void ejbActivate() { log("ejbActivate()"); } public void ejbPassivate() { log("ejbPassivate()"); } public void setSessionContext(SessionContext parm) { this.sessionContext = parm; } // Bean's business methods.
7: Enterprise JavaBeans and the EJB Container Model
public String getMsg() { log("getMsg()"); return "This is a message from an stateless session bean!"; } public void log(String parm) { System.out.println(new java.util.Date() +":SLSessionBean:"+this.hashCode()+" "+parm); } }
2. Create the Stateless Session Bean Home Interface Here is a home interface for our stateless session bean example:
package javaee.architect.SLSession; import javax.ejb.*; import java.rmi.*; // This is the remote home interface, used by clients as a // factory for EJB objects (remote references). The EJB // container vendor implements this extended interface. // In this home interface there is a create() method that // corresponds to the ejbCreate() method in bean code. public interface SLSessionRemoteHome extends EJBHome { // Creates/returns the EJB Object (remote reference). public SLSessionRemote create() throws CreateException, RemoteException; }
3. Create the Stateless Session Bean Remote Interface Here is a remote interface for our stateless session bean example:
package javaee.architect.SLSession; import javax.ejb.*; import java.rmi.*; // This is the remote interface, used by clients when // they need to call an EJB objects. The EJB container // vendor implements this extended interface, which is // responsible for delegating subsequent calls to the // bean code. public interface SLSessionRemote extends javax.ejb.EJBObject { // Returns a String to caller. public String getMsg() throws RemoteException; }
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