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Session Bean: is a non-persistent object that provides some business logic running on the server. Session beans do not provide system break down. There are two kinds of session beans
1. Stateless session beans
2. Stateful session beans
Entity Bean: is a persistent object that presents object views of the data, generally a row in a database. They have the primary key as a unique key identifier. Multiple EJB clients can give each entity bean. Entity beans may provide system shutdowns. Entity beans can have two kinds of persistence
1. Container-Managed Persistence (CMP) - The container is responsible for providing the bean's state.
2. Bean-Managed Persistence (BMP) - The entity bean is responsible for giving its own state.
Message-driven Bean: is added with the Java Message Service (JMS) to give the ability to react as a message consumer and perform asynchronous processing between the message producer and the server.
Elaborate with examples Vector or Object oriented graphics? Vector or Object-Oriented Graphics treats everything which is drawn as an object. Objects retain their identity afte
String concatenation and comparison public class StringTest { public static void main(String[] args) { int i = 4; int j = 5; System.out.println ("Hello" + i); // wi
Java Message Service: An interface executed by most J2EE containers to give point-to-point queueing and topic (publish/subscribe) behavior. JMS is frequently used by EJB's that req
The report: Your report must describe the requirements of the application, outline the design of the solution, and provide a testing procedure to prove the application works. In yo
What is numeric promotion? Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place.
Why do we call JavaScript an Object-based Language? In java language an JavaScript shares several similarities with object-oriented languages, and thus is known as an object-ba
Implement a class Book (Book.java). A book will have three instance variables: a title (a String, for example: "Big Java" or "The Hitchhiker's Guide to the Galaxy"), an author
(CarbonFootprint Interface: Polymorphism) Using interfaces, as you learned in this chapter, you can specify similar behaviors for possibly disparate classes. Governments and compan
What limitations are placed on method overriding ?
What is static in java? Static means one per class, not one for each object no matter how many example of a class might exist. This means that you can use them without making a
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