A Stateful Session Bean is a bean that is designed to service business processes that span multiple method requests or transactions. Stateful Session beans retain state on behalf of an individual client.
Latest Answer : stateful A stateful bean contains a conversational state that is retained across method calls and transactions. The create method takes arguments e.g. create(String id) , create(int I , String id) There can be one or more arguments in a create method ...
CMP: Tx behaviour in beans are defined in transaction attributes of the methods BMP: Programmers has to write a code that implements Tx behaviour to the bean class. Tuned CMP entity beans offer better
Latest Answer : Bean-managed persistence is more complicated than container-managed persistence because you must explicitly write the persistence logic into the bean class. In order to write the persistence handling code into the bean class, you must know what type of ...
Servlets maintain session in ServleContext and EJB’s in EJBContext.
Latest Answer : Serlvelts maintain session using HttpSession object and EJB's maintain session using Session Bean ...
Session beans > Associated with a client and keeps states for a client Entity Beans > Represents some entity in persistent storage such as a database
Latest Answer : Types of Enterprise Bean are:1. Session Bean i) Stateless Session Bean ii) Stateful Session Bean2. Entity Bean ...
Server side reusable java component Offers services that are hard to implement by the programmer Sun: Enterprise Bean architecture is a component architecture for the deployment and development of componentbased
Latest Answer : In simple terms Enterprise beans are nothing but Java programs (Objects written in Java)They are specifically used to implement business logic - for example(In a Banking software): customers are allowed to draw a maximum of 5000 rupees per time ...
ejbjar.xml + serverspecific xml file Which is then Packed in a jar – file together with bean classes. Beans are packaged into EJB JAR file , Manifest file is used to list EJB’s and jar file
Latest Answer : it is very good for interviews ...
Developer programs three classes: –Home interface, contains methods for creating (and locating for entity beans) bean instances. –Remote interface, contains business methods the bean offers.
Represents one row in the database: –Easy way to access database –business logic concept to manipulate data. Container managed persistence vs. bean managed persistence: Programmer creates three
Entity beans are effective when application wants to access one row at a time. If many rows needs to be fetched, using session beans can be better alternative Java class (for example, Integer). Entity
Normally, thinclient multitiered applications are hard to write because they involve many lines of intricate code to handle transaction and state management, multithreading, resource pooling, and other
