barcode 128 generator vb.net 7: Enterprise JavaBeans and the EJB Container Model in Java

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7: Enterprise JavaBeans and the EJB Container Model
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Locating an entity bean s local home interface using JNDI is accomplished in a similar manner. It doesn t, however, involve the APIs for remote access. For example, if the Item entity bean provided a local home interface rather than a remote home interface, a local client might use the following code segment:
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Context initialContext = new InitialContext(); ItemLocalHome itemHome = (ItemLocalHome) initialContext.lookup("java:ucny/um2z8/items");
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Local clients access entity beans through local and local home interfaces with the arguments of the local and local home methods being passed by reference. The enterprise bean provider should be aware that argument objects shared between local clients and entity beans can be modified by either the local clients or the entity beans. A local client can get a reference to an existing entity object s local interface in either of the following ways:
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n Receive the reference as a result of a method call. n Find the entity object using a finder() method defined in the entity bean s
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local home interface. A local client that has a reference to an entity object s local interface can invoke business methods on the entity object through the local interface.
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The CMP entity bean has been overhauled with EJB 3.0. Entity beans are now Plain Old Java Objects (POJOs) and component interfaces are no longer required. The bean class is now a concrete class and entity beans now support inheritance and polymorphism. Here is a summary of the major enhancements for EJB 3.0 entity beans:
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n Java language annotations (including Object Relational Mapping) n Support for inheritance and polymorphism n Simpler lightweight persistence model for Create, Read, Update and Delete
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(CRUD) operations using Java Persistence Layer s EntityManager API
n Enhanced query capabilities
State the Transactional Behavior in a Given Scenario
CERTIFICATION OBJECTIVE 7.06
State the Transactional Behavior in a Given Scenario for an Enterprise Bean Method with a Specif ied Transactional Deployment Descriptor
In this section, we review transactions, transaction management, and distributed transactions. Then we discuss the objective concerning transaction attribute settings as well as multiple transactions, the Java Transaction Service (JTS), the Java Transaction API (JTA), and the effect of the transaction attribute on entity and session bean methods.
Transactions and Transaction Management
A transaction is one or more tasks that execute as a single atomic operation or unit of work. If all tasks involved in a transaction do not proceed successfully, an inverse task or rollback procedure for all tasks is performed, setting all resources back to their original state. Transactions are characterized by the acronym ACID, which stands for Atomic, Consistent, Isolated, and Durable. The EJB container provides the services and management functions required to support transaction demarcation, transactional resource management, synchronization, and transaction context propagation. Since JDBC operates at the level of an individual database connection, it does not support transactions that span across multiple data sources. To compensate for this, the JTA provides access to the services offered by a transaction manager. If an EJB requires control of global transaction, it can get access to JTA via the container.
Distributed Transactions
Although the EJB framework can be used to implement a nontransactional system, the model was designed to support distributed transactions. EJB framework requires the use of a distributed transaction management system that supports two-phase commit protocols for flat transactions. In addition to container-managed transactions, an EJB may participate in clientmanaged and bean-managed transactions.
7: Enterprise JavaBeans and the EJB Container Model
The EJB architecture provides automatic support for distributed transactions in component-based applications. Such distributed transactions can automatically update data in multiple databases or even data distributed across multiple sites. The EJB model shifts the complexities of managing these transactions from the application developer to the container provider.
Transaction-Management Paradigms The Java Platform EE platform supports two transaction-management paradigms: declarative transaction demarcation and programmatic transaction demarcation. Declarative transaction management refers to a nonprogrammatic demarcation of transaction boundaries, achieved by specifying within the deployment descriptor the transaction attributes for the various methods of the container-managed EJB component. This is a flexible approach that facilitates changes in the application s transactional characteristics without modifying any code. Container-managed transaction demarcation must be used by entity EJB components.
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