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Easy Learn Java: Programming Articles, Examples and Tips - Page 452


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Read Java Certification SCBCD Study Guide - 2. Identify EJB 2.0 container requir

Go to all tips in Java Certification Books and Tests

Changes in Java Certification? Probably , but not so much as we believed Smile

Happens much since Java 1.2, 1.3? Yes and not. We continue to publish SCBCD Study Guide for you who is specializing in leveraging the Java 2 Platform, Enterprise Edition (J2EE) platform technologies. Despite to fact that this guide is for J2EE 1.3 you will get 95% of knowledge to pass 1.4 exam. By the way if you did not know, this certification is just one exam, but requires that you passed any certification for Sun Certified Programmer for Java 2 Platform (any edition) already.

Identify EJB 2.0 container requirements.


The EJB Provider can rely on the EJB 2.0 Container Provider to provide the following APIs:
  • Java 2 Platform, Standard Edition, v1.3 (J2SE) APIs
  • EJB 2.0 Standard Extension
  • JDBC 2.0 Standard Extension (support for row sets only)
  • JNDI 1.2 Standard Extension
  • JTA 1.0.1 Standard Extension (the UserTransaction interface only)
  • JMS 1.0.2 Standard Extension
  • JavaMail 1.1 Standard Extension (for sending mail only)
  • JAXP 1.0

Identify correct and incorrect statements or examples about EJB programming restrictions.

An enterprise Bean must not use read/write static fields. Using read-only ( final) static fields is allowed.

An enterprise Bean must not use thread synchronization primitives to synchronize execution of multiple instances.

An enterprise Bean must not use the AWT functionality to attempt to output information to a display, or to input information from a keyboard.

An enterprise bean must not use the java.io package to attempt to access files and directories in the file system.

An enterprise bean must not attempt to listen on a socket, accept connections on a socket, or use a socket for multicast. Enterprise bean instance is allowed be a network socket client.

The enterprise bean must not attempt to use the Reflection API to access information that the security rules of the Java programming language make unavailable.

The enterprise bean must not attempt to create a class loader; obtain the current class loader; set the context class loader; set security manager; create a new security manager; stop the JVM; or change the input, output, and error streams.

The enterprise bean must not attempt to manage threads. The enterprise bean must not attempt to start, stop, suspend, or resume a thread; or to change a thread’s priority or name.

The enterprise bean must not attempt to directly read or write a file descriptor.

The enterprise bean must not attempt to obtain the security policy information for a particular code source.

The enterprise bean must not attempt to load a native library.

The enterprise bean must not attempt to gain access to packages and classes that the usual rules of the Java programming language make unavailable to the enterprise bean.

The enterprise bean must not attempt to define a class in a package.

The enterprise bean must not attempt to pass this as an argument or method result. The enterprise bean must pass the result of SessionContext.getEJBObject(), SessionContext.getEJBLocalObject(), EntityContext.getEJBObject(), or EntityContext.getEJBLocalObject() instead.

 

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Read Java Certification SCBCD Study Guide - 1

Go to all tips in Java Certification Books and Tests

Changes in Java Certification? Probably, but not so much as you believe Cool

Happens much since Java 1.2, 1.3? Yes and not. We are starting to publish SCBCD Study Guide for you who is specializing in leveraging the Java 2 Platform, Enterprise Edition (J2EE) platform technologies. Despite to fact that this guide is for J2EE 1.3 you will get 95% of knowledge to pass 1.4 exam. By the way if you did not know, this certification is just one exam, but requires that you passed any certification for Sun Certified Programmer for Java 2 Platform (any edition) already.


SCBCD Study Guide

Chapter 1. EJB Overview

Identify the use, benefits, and characteristics of Enterprise JavaBeans technology, for version 2.0 of the EJB specification.

Characteristics

Enterprise JavaBeans architecture is the standard component architecture for building distributed object-oriented business applications.

Enterprise JavaBeans architecture makes it possible to build distributed applications by combining components developed using tools from different vendors.

Application developers do not have to understand low-level transaction and state management details, multi-threading, connection pooling, and other complex low-level APIs.

Enterprise JavaBeans applications follow the Write Once, Run Anywhere™ philosophy of the Java programming language.

The Enterprise JavaBeans architecture addresses the development, deployment, and runtime aspects of an enterprise application’s life cycle.

Enterprise JavaBeans architecture defines the contracts that enable tools from multiple vendors to develop and deploy components

Enterprise JavaBeans architecture is compatible with the CORBA protocols. This allows remote invocations on session and entity beans from J2EE components that are deployed in products from different vendors.

Benefits

Defines the integration of EJB with the Java Message Service. Introduces message-driven beans (MDB) - a stateless components that are invoked by the container as a result of the arrival of a JMS message (MDB does not have home/home-local or remote/local interfaces).

Provides a local client view and support for efficient, lightweight access to enterprise beans from local clients.

Provides improved support for the persistence of entity beans.

Provides improved support for the management of relationships among entity beans (Local CMP Beans only).

Provides a query syntax (EJB QL) for entity bean finder and select methods (CMP only).

Provides support for additional methods in the home interface (business logic methods via ejbHome<MethodName>().

 

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Posted by aalex on Saturday, May 06, 2006 (19:46:34) (4070 reads)

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