Transaction represents a group of activities that must be performed as a single work unit. This clarifies that a transaction is complete if and only if all the work items within a work group results in success. If any of the work items fails, then the transaction as a whole will be treated as a …
EJB
Entity Beans in EJB(BMP)
ENTITY BEAN WITHBEAN-MANAGED PERSISTENCE Thus far, we acquainted ourselves with Sessionbeans ( both stateless & stateful) and also CMP Entity bean. also read: Java EE Tutorials EJB Interview Questions EJB 3 Web Services Annotation and Dependency Injection in EJB 3 Query API in EJB 3 In this instalment, we take up the most difficult type, …
Entity Beans in EJB(CMP)
Entity beans are characterized by the following 3 features. They are 'Persistent'. ( they are stored inhard-disk) They are shared by many clients. They have ,'Primary key'. also read: Java EE Tutorials EJB Interview Questions EJB 3 Web Services Annotation and Dependency Injection in EJB 3 Query API in EJB 3 As already mentioned ,Entity …
Introduction to Java Persistence API(JPA)
Introduction Java Persistence API (JPA) provides POJO (Plain Old Java Object) standard and object relational mapping (OR mapping) for data persistence among applications. Persistence, which deals with storing and retrieving of application data, can now be programmed with Java Persistence API starting from EJB 3.0 as a result of JSR 220. This API has borrowed …