Chapter 8. Entity Beans

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Chapter 8. Entity Beans

Chapter 8. Entity Beans
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Chapter 8. Entity Beans

From a list of behaviors, match them with the appropriate EntityContext method responsible for that behavior.

A CONTAINER provides the entity bean instances with an EntityContext, which gives the entity bean instance access to the instance’s context maintained by the container. The EntityContext interface has the following methods:

  • The getEJBObject method returns the entity bean’s REMOTE [component] interface.

  • The getEJBHome method returns the entity bean’s REMOTE HOME interface.

  • The getEJBLocalObject method returns the entity bean’s LOCAL [component] interface.

  • The getEJBLocalHome method returns the entity bean’s LOCAL HOME interface.

  • The getCallerPrincipal method returns the java.security.Principal that identifies the invoker of the bean instance’s EJB object.

  • The isCallerInRole method tests if the entity bean instance’s caller has a particular role.

  • The setRollbackOnly method allows the instance to mark the current transaction such that the only outcome of the transaction is a rollback (EntityBeans support ONLY CMT).

  • The getRollbackOnly method allows the instance to test if the current transaction has been marked for rollback. (EntityBeans support ONLY CMT).

  • The getPrimaryKey method returns the entity bean’s primary key.

  • The getUserTransaction method returns the javax.transaction.UserTransaction interface. Entity bean instances MUST NOT call this method. It is derived from EJBContext interface, which is parent for contexts for all 3 types of EJB, but it is used ONLY with BMT in Session Beans and Messages Driven Beans.

public interface EntityContext extends EJBContext {
	EJBLocalObject getEJBLocalObject() throws IllegalStateException;
	EJBObject getEJBObject() throws IllegalStateException;
	Object getPrimaryKey() throws IllegalStateException;
}
					
public interface EJBContext {
	EJBHome getEJBHome();
	EJBLocalHome getEJBLocalHome();
	Principal getCallerPrincipal();
	boolean isCallerInRole(String roleName);
	UserTransaction getUserTransaction() throws IllegalStateException;
	void setRollbackOnly() throws IllegalStateException;
	boolean getRollbackOnly() throws IllegalStateException;
}

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From a list, identify the responsibility of the container for a CMP entity bean, including but not limited to: setEntityContext, unsetEntityContext, ejbCreate, ejbPostCreate, ejbActivate, ejbPassivate, ejbRemove, ejbLoad, ejbStore, ejbFind, ejbHome, and ejbSelect.  Home Identify correct and incorrect statements or examples about an entity bean's primary key and object identity.

Tutorials

  1. Appendix A. First Appendix
  2. Second Section
  3. Third Section
  4. Part II. Appendixes
  5. From a list, identify the responsibility of the bean provider and the responsibility of the container provider for a message-driven bean.
  6. Chapter 6. Component Contract for Container-Managed Persistence (CMP)
  7. Identify correct and incorrect statements or examples about persistent relationships, remove protocols, and about the abstract schema type of a CMP entity bean.
  8. Identify the interfaces and methods a CMP entity bean must and must not implement.
  9. Match the name with a description of purpose or functionality, for each of the following deployment descriptor elements: ejb-name, abstract-schema-name, ejb-relation, ejb-relat
  10. Identify correctly-implemented deployment descriptor elements for a CMP bean (including container-managed relationships).
  11. 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
  12. Chapter 7. CMP Entity Bean Life Cycle
  13. Identify correct and incorrect statements or examples about the rules and semantics for relationship assignment and relationship updating in a CMP bean.
  14. From a list, identify the responsibility of the container for a CMP entity bean, including but not limited to: setEntityContext, unsetEntityContext, ejbCreate, ejbPostCreate, ejbActi
  15. Given a code listing, determine whether it is a legal and appropriate way to programmatically access a caller's security context.
  16. Chapter 10. Message-Driven Bean Component Contract
  17. 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
  18. 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.
  19. Chapter 12. Exceptions
  20. Identify correct and incorrect statements or examples about the client view of an entity bean's local component interface (EJBLocalObject).
  21. Identify EJB 2.0 container requirements.
  22. Chapter 1. EJB Overview
  23. Identify correct and incorrect statements or examples about EJB programming restrictions.
  24. Chapter 9. EJB-QL
  25. Identify correct and incorrect statements or examples about the purpose and use of EJB QL.
  26. Identify correct and incorrect conditional expressions, BETWEEN expressions, IN expressions, LIKE expressions, and comparison expressions.
  27. Identify correct and incorrect statements or examples about the client view of a entity bean's remote component interface (EJBObject).
  28. Given a list, identify which are requirements for an EJB-jar file.
  29. Match EJB roles with the corresponding description of the role's responsibilities, where the description may include deployment descriptor information.
  30. Chapter 2. Client View of a Session Bean
  31. Chapter 13. Enterprise Bean Environment
  32. Chapter 8. Entity Beans
  33. 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
  34. Identify correct and incorrect statements or examples about an entity bean's primary key and object identity.
  35. Identify correct and incorrect statements or examples about the client's view of exceptions received from an enterprise bean invocation.
  36. Identify correct and incorrect statements or examples about application exceptions and system exceptions in entity beans, session beans, and message-driven beans.
  37. 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.
  38. 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
  39. SCBCD Study Guide
  40. Identify the use and behavior of the MessageDrivenContext interface methods.