J2EE - Basic

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J2EE

Memory Leakage

JProbe

Pay attention to those lead area

Event Listener class

Member variable not set to Null

Static Class

EJB3

JNDI

Naming Context: All name in java:comp/env

Resource Manager Type

Connection Factory Type

JNDI Subcontext

JDBC

javax.sql.DataSource

java:comp/env/jdbc

JMS

javax.jms.TopicConnectionFactory

javax.jms.QueueConnectionFactory

java:comp/env/jms

JavaMail

javax.mail.Session

java:comp/env/mail

URL

java.net.URL

java:comp/env/url

Connector

javax.resource.cci.ConnectionFactory

java:comp/env/eis

JAXR Resource Adapter

javax.xml.registry.ConnectionFactory

java:comp/env/eis/JAXR

Archieve to .jar

-com

-classes

-META-INF

-MANIFEST.MF

Eclipse

Ant

<?xml version="1.0"?>

<project name="jartest" default="jar basedir=".">

<property name="build.dir" value="${basedir}/build" />

<property name="build.classes.dir" value="${basedir}/classes" />

<target name="jar" description="Archieve to jar">

<jar jarfile="${basedir}/ejbfile.jar">

Annotation

BeanStructure

Package

META-INF

ejb-jar.xml (Deployment Descriptor)

Can use annotation instead!

MessageDrivenBean

EJB Managed - MessageListener

Handle JMS

EntityBean

JDBC+JavaBean

OR Mapping

SessionBean

Interceptor(@AroundInvoke)

InvocationContext

Local

Remote

Stateful

Stateless

Life-Cycle

newInstance()

JBoss

Object Container

Collection

Set

TreeSet

HashSet

No Duplicate

List

LinkedList

removeLast()

removeFirst()

getLast()

getFirst()

addLast()

addFirst()

More transaction..

ArrayList

list.size()

list.add()

list.get()

Iterator iterator = list.iterator();

while(iterator.hasNext())

List list = new ArrayList();

Ordering

Map

TreeMap

HashMap

Map map = new HashMap();