Ejb 2v0 Matrix printable pdf download

EJB 2.0 Matrix

Eileen Sauer

Email:

The following matrix shows:

2.0 additions:

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Interfaces

Message driven beans and integration with JMS

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Methods for those interfaces

CMP revised for entity beans, added container managed relationships

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When they occur, under what conditions

Defined local interfaces and local home interfaces for session/entity beans

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Related sections in the EJB 2.0 Final Release (8/14/01)

QL – declarative query language

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Added select methods for internal use of entity beans with CMP

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My gratitude to Gal Binyamini and Doug Bateman for their

Added support for business logic methods on home interface

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invaluable feedback for this version of the EJB matrix.

Added declarative run-as security identity functionality for enterprise beans

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Defined CORBA interoperability protocol

Clients

Remote Clients

Local Clients

general

Client of an SB or EB may be remote client or local client. Typically one or the other view will be provided. 4.2.1

ES: PFD1 had dependent objects; these local interfaces in PFD2 essentially replace dependent objects. More consistency, e.g. now create a graph of beans with same

interfaces, transactional/security/persistence behavior, etc. Issues: issues with semantic differences, best practices?

Access SBs or EBs through the remote interface and remote home interface 5.2

Collocated in the same JVM with the SB or EB 5.3

Location independent, Java RMI interfaces 5.2

Not location independent, access SBs or EBs through local interface and local

Args/results passed by value, protects against inadvertent modification, classes

home interface 5.3

decoupled from persistence layer 5.2, 5.4, 10.3.10

Args/results passed by reference, can manipulate large amount of data 5.3, 5.4

client types

Can be Java application, applet, servlet. Can be mapped to non-Java clients 5.2

May be another enterprise bean (SB, EB or MDB) 5.3

determining view

Loose coupling between client and bean, potentially expensive 5.4

Supports fine-grained component access 5.4

Requires javax.rmi.PortableRemoteObject.narrow() instead of Java casts 5.4

includes

Home/component interfaces, object identity, metadata interface, handle

Home/component interfaces, object identity

home interface

extends javax.ejb.EJBHome

extends javax.ejb.EJBLocalHome

home.createXXX() returns remote interface, unlike ejbCreate() 6.3.1

home.createXXX() returns local interface, unlike ejbCreate() 6.4.1

home lookup

Context ctx = new InitialContext();

cartHome cartHome = (CartHome)javax.rmi.PortableRemoteObject.narrow(

CartHome cartHome = (CartHome) ctx.lookup(“java:comp/env/ejb/cart”); 6.2.1

ctx.lookup(“java:comp/env/ejb/cart”), CartHome.class); 6.2.1

component interface

extends javax.ejb.EJBObject

extends javax.ejb.EJBLocalObject

Reference must not be passed out of the JVM in which it was created 6.7.2

exceptions

javax.ejb.NoSuchObjectException

javax.ejb.NoSuchObjectLocalException

java.rmi.RemoteException

javax.ejb.EJBException

_______________________________________________________________________________________________________________________________________________________

Eileen Sauer, Volantec.biz

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Ejb 2v0 Matrix

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