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Identify correct and incorrect statements or examples about the client view of a session bean's local and remote component interfaces.
Posted on: April 18, 2011 at 12:00 AM
This page discusses - Identify correct and incorrect statements or examples about the client view of a session bean's local and remote component interfaces.

Identify correct and incorrect statements or examples about the client view of a session bean's local and remote component interfaces.

A client NEVER DIRECTLY accesses instances of the session bean’s class. A client always uses the session bean’s COMPONENT interface to access a session bean’s instance. The class that implements the session bean’s component interface is provided by the container.

A session EJBObject supports:

  • The business logic methods of the object. The session EJBObject delegates invocation of a business method to the session bean instance.

  • Get the session object’s remote home interface.

  • Get the session object’s handle.

  • Test if the session object is identical with another session object.

  • Remove the session object.

				
public interface EJBObject extends Remote {
	EJBHome getEJBHome() throws RemoteException;
	Handle getHandle() throws RemoteException;
	Object getPrimaryKey() throws RemoteException;
	boolean isIdentical(EJBObject obj) throws RemoteException;
	void remove() throws RemoteException, RemoveException;
}
					

A session EJBLocalObject supports:

  • The business logic methods of the object. The session EJBLocalObject delegates invocation of a business method to the session bean instance.

  • Get the session object’s local home interface.

  • Test if the session object is identical with another session object.

  • Remove the session object.

public interface EJBLocalObject {
	EJBLocalHome getEJBLocalHome() throws EJBException;
	Object getPrimaryKey() throws EJBException;
	boolean isIdentical(EJBLocalObject obj) throws EJBException;
	void remove() throws RemoveException, EJBException;
}				
					

Method getPrimaryKey() on session bean will throw EJBException (local SB) or RemoteException (remote SB) because session bean does not have primary key.

EJBObject interface extends Remote (marker) interface.

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