Chapter 6. Component Contract for Container-Managed Persistence (CMP)

This page discusses - Chapter 6. Component Contract for Container-Managed Persistence (CMP)


 

Ads

Tutorials   
Chapter 5. Client View of an Entity Identify correct and incorrect statements about the Application Assembler's responsibilities, including the use of deployment descriptor elements related to transactions and the identifica Given a list of responsibilities, identify whose which are the Container's with respect to transactions, including the handling of getRollbackOnly, setRollbackOnly, getUserTransacti EJB Transactional Attributes Chapter 11. Transactions Given a list of scenarios, identify which will result in an ejbRemove method not being called on a bean instance. Given a list of responsibilities related to session beans, identify those which are the responsibility of the session bean provider and those which are the responsibility of the EJB contai Given a list of methods for a stateful or stateless session bean class, define which of the following operations can be performed from each of those methods: SessionContext interface metho Chapter 4. Session Bean Life Cycle Identify correct and incorrect statements or examples about the client view of a session bean's local and remote component interfaces. Identify the interface and method for each of the following: retrieve the session bean's remote home interface, retrieve the session bean's local component interface, determine if the sessio Match the correct description about purpose and function to which session bean type they apply: stateless, stateful, or both. Chapter 14. Security Management Given a security-related deployment descriptor tag, identify correct and incorrect statements and code related to that tag. Given a list of responsibilities, identify which belong to the deployer, bean provider, application assembler, container provider, system administrator, or any combination. From a list of responsibilities, identify which belong to the application assembler, bean provider, deployer, container provider, or system administrator. Part I. Exam Objectives Preface Identify the interfaces and methods a JMS message-driven bean must implement. Identify the use and behavior of the MessageDrivenContext interface methods. SCBCD Study Guide Given a list of responsibilities related to exceptions, identify those which are the bean provider's, and those which are the responsibility of the container provider. Be prepared to recog Given a particular method condition, identify the following: whether an exception will be thrown, the type of exception thrown, the container's action, and the client's view. Identify correct and incorrect statements or examples about application exceptions and system exceptions in entity beans, session beans, and message-driven beans. Identify correct and incorrect statements or examples about the client's view of exceptions received from an enterprise bean invocation. Identify correct and incorrect statements or examples about an entity bean's primary key and object identity. Identify the use, syntax, and behavior of, the following entity bean home method types, for Container-Managed Persistence (CMP); finder methods, create methods, remove methods, and home me Chapter 8. Entity Beans Chapter 13. Enterprise Bean Environment Chapter 2. Client View of a Session Bean Match EJB roles with the corresponding description of the role's responsibilities, where the description may include deployment descriptor information. Given a list, identify which are requirements for an EJB-jar file. Identify correct and incorrect statements or examples about the client view of a entity bean's remote component interface (EJBObject). Identify correct and incorrect conditional expressions, BETWEEN expressions, IN expressions, LIKE expressions, and comparison expressions. Identify correct and incorrect statements or examples about the purpose and use of EJB QL. Chapter 9. EJB-QL Identify correct and incorrect statements or examples about EJB programming restrictions. Chapter 1. EJB Overview Identify EJB 2.0 container requirements. Identify correct and incorrect statements or examples about the client view of an entity bean's local component interface (EJBLocalObject). Chapter 12. Exceptions Identify the use and the behavior of the ejbPassivate method in a session bean, including the responsibilities of both the container and the bean provider. Identify correct and incorrect statements about the purpose and use of the deployment descriptor elements for environment entries, EJB references, and resource manager connection factory r Chapter 10. Message-Driven Bean Component Contract Given a code listing, determine whether it is a legal and appropriate way to programmatically access a caller's security context. From a list, identify the responsibility of the container for a CMP entity bean, including but not limited to: setEntityContext, unsetEntityContext, ejbCreate, ejbPostCreate, ejbActi Identify correct and incorrect statements or examples about the rules and semantics for relationship assignment and relationship updating in a CMP bean. Chapter 7. CMP Entity Bean Life Cycle From a list, identify the purpose, behavior, and responsibilities of the bean provider for a CMP entity bean, including but not limited to: setEntityContext, unsetEntityContext, ejbC Identify correctly-implemented deployment descriptor elements for a CMP bean (including container-managed relationships).
Ads

Chapter 6. Component Contract for Container-Managed Persistence (CMP)

Identify correct and incorrect statements or examples about the entity bean provider's view and programming contract for CMP, including the requirements for a CMP entity bean.

An entity bean implements an object view of a business entity or set of business entities stored in an underlying database or implemented by an existing enterprise application

An entity bean with container-managed persistence (CMP) typically consists of its entity bean class; a component interface which defines its client view business methods; a home interface which defines the create, remove, home, and finder methods of its client view; and its abstract persistence schema as specified in the deployment descriptor (META-INF/ejb-jar.xml).

A client of an entity bean can control the lifecycle of a bean by using the bean’s HOME interface and can manipulate the bean as a business entity by using the methods defined by its COMPONENT interface. The home and component interfaces of a bean define its CLIENT VIEW.

The bean provider MUST observe the following programming contract when defining an entity bean class that uses container-managed persistence (CMP):

  • The Bean Provider must define the entity bean class as an ABSTRACT class. The container provides the implementation class that is used at RUNTIME.

  • The container-managed persistent fields and container-managed relationship fields MUST NOT be defined in the entity bean class. From the perspective of the Bean Provider, the container-managed persistent (CMP) fields and container-managed relationship (CMR) fields are VIRTUAL fields only, and are accessed through get and set accessor methods. The IMPLEMENTATION of the container-managed persistent fields and container-managed relationship fields is supplied by the Container.

  • The container-managed persistent (CMP) fields and container-managed relationship (CMR) fields MUST be specified in the deployment descriptor (DD) using the cmp-field and cmr-field elements respectively. The names of these fields MUST be valid Java identifiers and must begin with a LOWERCASE letter.

  • The Bean Provider MUST define the accessor methods for the container-managed persistent fields and container-managed relationship fields as get and set methods, using the JavaBeans conventions. The IMPLEMENTATION of the accessor methods is supplied by the Container.

  • The accessor methods MUST be public, MUST be abstract, and MUST bear the name of the container-managed persistent field (cmp-field) or container-managed relationship field (cmr-field) that is specified in the deployment descriptor (DD), and in which the first letter of the name of the cmp-field or cmr-field has been UPPERCASED and prefixed by “get” or “set”.

  • The accessor methods for a container-managed relationship (CMR) field MUST be defined in terms of the LOCAL interface of the related entity bean.

  • The accessor methods for container-managed relationship fields for one-to-many or many-to-many relationships MUST utilize one of the following Collection interfaces: java.util.Collection or java.util.Set. The Collection interfaces used in relationships are specified in the deployment descriptor. The IMPLEMENTATION of the collection classes used for the container-managed relationship fields is supplied by the Container.

  • An entity bean local interface type (or a collection of such) CAN be the type of a cmr-field. An entity bean local interface type (or a collection of such) CAN NOT be the type of a cmp-field.

  • The accessor methods for the container-managed relationship fields MUST NOT be exposed in the REMOTE interface of an entity bean.

  • The LOCAL interface types of the entity bean and of related entity beans MUST NOT be exposed through the REMOTE interface of the entity bean.

  • The collection classes that are used for container-managed relationships MUST NOT be exposed through the REMOTE interface of the entity bean.

  • Once the primary key for an entity bean has been set, the Bean Provider MUST NOT attempt to change it by use of set accessor methods on the primary key cmp-fields. The Bean Provider SHOULD therefore NOT expose the SET accessor methods for the primary key cmp-fields in the component interface of the entity bean.

  • The Bean Provider MUST ensure that the Java types assigned to the cmp-fields are restricted to the following: Java primitive types and Java serializable types.

Visit http://java.boot.by  for the updates.

Advertisements

Share on Google+Share on Google+

Chapter 6. Component Contract for Container-Managed Persistence (CMP)

Posted on: April 18, 2011 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Advertisements

 

Discuss: Chapter 6. Component Contract for Container-Managed Persistence (CMP)  

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments:0

Ads

 

Ads