Enterprise java beans(ejb)

Enterprise Java Beans(EJB) With EJBs, you can develop building blocks ‘ejb components ’ – that u and someone else can assemble and reassemble into different applications. For example , you might create a customer bean that represents a customer in database. You can use that Customer bean in an accouting program, an e-commerce shopping cart and a tech support application. One beauty of EJBs is that you take code reuse to a whole new level, instead of just code it reuses whole functionality and allows you modify that way bean behaves at runtime with touching its java code. 06/17/10 JavaTruths by Vikram Singh

Enterprise Java Beans: What really EJBs gives you ,[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

How does it all works? ,[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

Type of Beans ,[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

Session Bean can be stateless or stateful ,[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

FIVE THING YOU DO TO BUILD A BEAN ,[object Object],[object Object],[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

Write the Bean Class ,[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

AdviceGuy Bean ,[object Object],[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

BEAN CLASS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],You need this package These four methos are from SessionBean interface, so you have to put them here,for now worry about what these are for! You must have an ejbCreate() method. Its an ejb rule we’ll learn about later. But it doesn’t come from SessionBean interface. You must implemet one of three bean type interfaces: 06/17/10 JavaTruths by Vikram Singh

Write two interfaces for the Bean ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],It must extend either the EJBObject or EJBLocalObject. This is the actual business method. It MUST correspond to a method in the bean class. 06/17/10 JavaTruths by Vikram Singh

Home Interface ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The create() method must return your component interface type!! The home must extend either the EJBHome interface or EJBLocalHome 06/17/10 JavaTruths by Vikram Singh

Create an XML DD ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Specify home interface name Remote interface 06/17/10 JavaTruths by Vikram Singh

Put the Bean, the interface and the DD into ejb-jar file META-INF EJB-JAR.XML MYPACKAGE AdvcieBean.class AdviceHome.class Advice.class MYEJB.JAR ejb-jar.xml must be in a directory named META-INF 06/17/10 JavaTruths by Vikram Singh

Deploy the bean into the server,using the tools provided by the server vendor 06/17/10 JavaTruths by Vikram Singh

How to call a bean from Client Side? ,[object Object],[object Object],[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

The Client Code(AdviceClient.java) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Finally we get to the actual business methods. Lookup the AdviseBean using the JNDI name we gave during deployment. Initialcontext is our entrypoint into JNDI directory 06/17/10 JavaTruths by Vikram Singh

EJB ARCHITECTURE 06/17/10 JavaTruths by Vikram Singh

EJB uses RMI 06/17/10 JavaTruths by Vikram Singh

How EJB uses RMI 06/17/10 JavaTruths by Vikram Singh

EJB uses RMI ,[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

*** ,[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

*** ,[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

Tricky Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/17/10 JavaTruths by Vikram Singh

06/17/10 JavaTruths by Vikram Singh

Enterprise java beans(ejb)

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Enterprise java beans(ejb)

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