book

Enterprise JavaBeans, Second Edition

Name: Enterprise JavaBeans, Second Edition
Author: Richard Monson-Haefel
ISBN: 9781565928695

by Richard Monson-Haefel

September 2001

Intermediate to advanced

489 pages

14h 44m

English

O'Reilly Media, Inc.

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Enterprise JavaBeans, 2nd Edition
Dedication
Preface
What Is Enterprise JavaBeans?
Who Should Read This Book?
Organization
Software and Versions
Conventions
Comments and Questions
Acknowledgments
1. Introduction
Setting the StageDistributed ObjectsServer-Side ComponentsComponent Transaction Monitors

Enterprise JavaBeans: Defined
Distributed Object Architectures
Rolling Your Own Distributed Object
Component Models
Component Transaction Monitors
TP MonitorsObject Request BrokersCTMs: The Hybrid of ORBs and TP MonitorsAnalogies to Relational Databases
CTMs and Server-Side Component Models
MTSEJB and CORBA CTMsBenefits of a Standard Server-Side Component Model
Titan Cruises: An Imaginary Business
What’s Next?
2. Architectural Overview
The Enterprise Bean ComponentClasses and InterfacesThe remote interfaceThe home interfaceThe bean classThe primary keyWhat about session beans?Deployment Descriptors and JAR FilesEJB 1.0: Deployment descriptorsEJB 1.1: Deployment descriptorsThe Unseen PiecesThe EJB objectThe EJB homeDeploying a bean
Using Enterprise Beans
Getting Information from an Entity BeanModeling Workflow with Session BeansStateless and stateful session beans
The Bean-Container Contract
The Container-Server Contract
Summary
3. Resource Management and the Primary Services
Resource ManagementInstance PoolingThe entity bean life cycleOverview of state transitionsInstance swappingThe Activation Mechanism
Primary Services
ConcurrencyReentranceTransactionsPersistenceObject-to-relational persistenceObject database persistenceLegacy persistenceDistributed ObjectsNamingSecurityEJB 1.1: Role-driven access controlEJB 1.0: Method-driven access control
What’s Next?
4. Developing Your First Enterprise Beans
Choosing and Setting Up an EJB ServerSetting Up Your Java IDE
Developing an Entity Bean
Cabin: The Remote InterfaceCabinHome: The Home InterfaceCabinPK: The Primary KeyCabinBean: The Bean ClassEJB 1.1: The Deployment DescriptorEJB 1.0: The Deployment Descriptorcabin.jar: The JAR FileEJB 1.1: Packaging the Cabin beanEJB 1.0: Packaging the Cabin beanCreating a CABIN Table in the DatabaseDeploying the Cabin BeanEJB 1.1 deployment toolsEJB 1.0 deployment toolsCreating a Client ApplicationEJB 1.1: Obtaining a remote reference to the home interfaceEJB 1.0: Obtaining a remote reference to the home interfaceCreating a new Cabin bean
Developing a Session Bean
TravelAgent: The Remote InterfaceTravelAgentHome: The Home InterfaceTravelAgentBean: The Bean ClassEJB 1.1: TravelAgentBeanEJB 1.0: TravelAgentBeanEJB 1.1: TravelAgent Bean’s Deployment DescriptorEJB 1.0: The TravelAgent Beans’ Deployment DescriptorEJB 1.1: The JAR FileEJB 1.0: The JAR FileDeploying the TravelAgent BeanCreating a Client Application
5. The Client View
Locating Beans with JNDI
The EJB Client-Side API
EJB 1.1: Java RMI-IIOP Conformance RequirementEJB 1.1 and 1.0: The Java RMI Programming ModelEJB 1.1: Java RMI-IIOP type restrictionsEJB 1.1: Explicit narrowing using PortableRemoteObjectThe Home InterfaceRemoving beansBean metadataEJB 1.1: The HomeHandleCreating and finding beansThe Remote InterfaceEJBObject, Handle, and Primary KeyGetting the EJBHomePrimary keyComparing beans for identityRemoving beansThe bean handleEJB 1.1: HomeHandleInside the Handle
6. Entity Beans
Container-Managed PersistenceThe Remote InterfaceSet and get methodsThe Primary KeyCompound primary keysSingle-field keyEJB 1.1: Undefined primary keysThe Home InterfaceThe find methodsJava RMI Return Types, Parameters, and ExceptionsThe ShipBean ClassImplementing the javax.ejb.EntityBean InterfaceThe EntityContextThe Create MethodsejbCreate( )ejbPostCreate( )ejbCreate() and ejbPostCreate( ) sequence of eventsUsing ejbLoad() and ejbStore( ) in container-managed beansEJB 1.1: Deploying the ShipBeanEJB 1.0: Deploying the ShipBeanThe Client Application
Bean-Managed Persistence
Making the ShipBean a Bean-Managed EntityException HandlingEntityContextEJB 1.1: EJBContextEJB 1.0: EJBContextObtaining a Connection to the DatabaseEJB 1.1: Using JDBC in EJBEJB 1.0: Using JDBC in EJBThe ejbCreate( ) MethodThe ejbLoad( ) and ejbStore( ) MethodsThe ejbRemove( ) MethodejbFind( ) MethodsEJB 1.1: Deploying the Bean-Managed Ship BeanEJB 1.0: Deploying the Bean-Managed Ship Bean
The Life Cycle of an Entity Bean
Does Not ExistThe Pooled StateThe Ready StateTransitioning from the Pooled state to the Ready State via creationTransitioning from the Pooled state to the Ready State via a find methodTransitioning from the Pooled state to the Ready State via activationTransitioning from the Ready State to the Pooled state via passivationTransitioning from the Ready State to the Pooled state via removalLife in the Ready StateEnd of the Life Cycle
7. Session Beans
The Stateless Session BeanDownloading the Missing PiecesThe ProcessPayment BeanPAYMENT: The database tableProcessPayment: The remote interfaceDependent classes: The CreditCard and Check classesPaymentException: An application exceptionProcessPaymentHome: The home interfaceProcessPaymentBean: The bean classEJB 1.1: Accessing environment propertiesEJB 1.1: EJBContextEJB 1.1: The ProcessPayment bean’s deployment descriptorEJB 1.0: The ProcessPayment bean’s deployment descriptor
The Life Cycle of a Stateless Session Bean
Does Not ExistThe Method-Ready PoolTransitioning to the Method-Ready PoolLife in the Method-Ready PoolTransitioning out of the Method-Ready Pool: The death of a stateless bean instance
The Stateful Session Bean
The TravelAgent BeanTravelAgent: The remote interfaceTravelAgentHome: The home interfaceTaking a peek at the client viewTravelAgentBean: The bean classWhy use a Reservation entity bean?listAvailableCabins( ): Listing behaviorEJB 1.1: The TravelAgent deployment descriptorEJB 1.0: The TravelAgent deployment descriptor
The Life Cycle of a Stateful Session Bean
Does Not ExistThe Method-Ready StateTransitioning to the Method-Ready stateLife in the Method-Ready stateTransitioning out of the Method-Ready stateEJB 1.1 timeoutsEJB 1.0 timeoutsPassivated StateEJB 1.1 system exceptions
8. Transactions
ACID TransactionsIs the TravelAgent Bean Atomic?Is the TravelAgent Bean Consistent?Is the TravelAgent Bean Isolated?Is the TravelAgent Bean Durable?
Declarative Transaction Management
Transaction ScopeTransaction AttributesEJB 1.1: Setting a transaction attributeEJB 1.0: Setting a transaction attributeTransaction Attributes DefinedTransaction Propagation
Isolation and Database Locking
Dirty, Repeatable, and Phantom ReadsDirty readsRepeatable readsPhantom readsDatabase LocksTransaction Isolation LevelsEJB 1.1 transaction isolation controlEJB 1.0 transaction isolation controlBalancing Performance Against ConsistencyEJB 1.1: Controlling isolation levelsEJB 1.0: Controlling isolation levels
Non-Transactional Beans
Explicit Transaction Management
Transaction Propagation in Bean-Managed TransactionsHeuristic DecisionsUserTransactionStatusEJBContext Rollback Methods
EJB 1.1: Exceptions and Transactions
Application Exceptions Versus System ExceptionsSystem exceptionsApplication exceptions
EJB 1.0: Exceptions and Transactions
Container-Initiated TransactionsClient-Initiated TransactionsBean-Managed TransactionsUnchecked Exceptions
Transactional Stateful Session Beans
The Transactional Method-Ready StateTransitioning into the Transactional Method-Ready stateLife in the Transactional Method-Ready state
9. Design Strategies
Hash Codes in Compound Primary KeysWell-Distributed Versus Unique Hash Codes
Passing Objects by Value
Dependent ObjectsValidation Rules in Dependent ObjectsBulk AccessorsRules-of-thumb for bulk accessorsEntity Objects
Improved Performance with Session Beans
Network Traffic and LatencyResource ConsumptionStriking a BalanceListing BehaviorImplementing lists as arrays of structuresImplementing lists as ResultSets
Bean Adapters
Implementing a Common Interface
Why the Bean Class Shouldn’t Implement the Remote InterfaceThe Business Interface Alternative
Entity Beans Without Create Methods
Entity Bean Relationships
Simple AssociationsMaintaining the database mappingMapping serializable to VARBINARYPreserving the primary keyPreserving the handleNative Java persistenceComplex Entity RelationshipsOne-to-many database mappingMapping serializable to VARBINARYNative Java persistence
Object-to-Relational Mapping Tools
When Entity Beans Are Not an Option
Emulating Entity Beans with Session BeansLimiting Session Beans to WorkflowDirect database access with JDBCDirect access with object-to-relational mapping tools
Avoid Chaining Stateful Session Beans
10. XML Deployment Descriptors
What Is an XML Deployment Descriptor?
The Contents of a Deployment Descriptor
The Document Header
The Descriptor’s Body
Describing Beans
Session and Entity BeansSpecifying Primary KeysDeferring primary key definitionEnvironment EntriesReferences to Other BeansReferences to External ResourcesSecurity Roles
Describing Bean Assembly
Specifying a Bean’s Transactional AttributesSpecifying Security Roles and Method PermissionsAssigning roles to methodsIdentifying Specific MethodsWildcard declarationsNamed method declarationsSpecific method declarationsRemote/home differentiation
The ejb-jar File
The client-jar File
11. Java 2, Enterprise Edition
Servlets
Java Server Pages
Web Components and EJB
J2EE Fills in the Gaps
J2EE Application Client ComponentsGuaranteed ServicesConnectivity and Interoperability
Fitting the Pieces Together
Future Enhancements
A. The Enterprise JavaBeans API
Package: javax.ejbCreateExceptionDuplicateKeyExceptionEJBContextEJBException (1.1)EJBHomeEJBMetaDataEJBObjectEnterpriseBeanEntityBeanEntityContextFinderExceptionHandleHomeHandle (1.1)NoSuchEntityException (1.1)ObjectNotFoundExceptionRemoveExceptionSessionBeanSessionContextSessionSynchronization
Package: javax.ejb.deployment (EJB 1.0 Only)
AccessControlEntryControlDescriptorDeploymentDescriptorEntityDescriptorSessionDescriptor
B. State and Sequence Diagrams
Entity BeansLife Cycle State Diagram of the Entity BeanSequence Diagrams for Container-Managed PersistenceSequence Diagrams for Bean-Managed Persistence
Session Beans
Stateless Session BeansStateful Session BeansEJB 1.1: Interactions Between Exceptions and Transactions
C. EJB Vendors
Commercial Products
Open Source Projects
D. New Features in EJB 1.1
Entity Beans
Session Beans
XML Deployment Descriptors
The Default JNDI Context
RMI over IIOP Narrowing
Security
Looking Ahead to EJB 2.0
Index
Colophon

Content preview from Enterprise JavaBeans, Second Edition

Session Beans

Stateless Session Beans

Figure B-6. Life cycle state diagram of the stateless session bean

Figure B-7. Creation and removal of the stateless session bean

Table 2.3 and Table 2.4 summarize the operations that are legal for a stateless session bean.

Table B-3. Allowed Operations for Stateless Session Beans in EJB 1.1

Allowed Operations

Method

Container-Managed Transactions

Bean-Managed Transactions

setSessionContext()

EntityContext methods:

getEJBHome()

JNDI ENC contexts:

Properties java:comp/env

EntityContext methods:

getEJBHome()

JNDI ENC contexts:

Properties java:comp/env

ejbCreate()

ejbRemove()

EntityContext methods:

getEJBHome()

getEJBObject()

JNDI ENC contexts:

Properties java:comp/env

EntityContext methods:

getEJBHome()

getEJBObject()

getUserTransaction()

JNDI ENC contexts:

Properties java:comp/env

business methods

EntityContext methods:

getEJHome()

getCallerPrincipal()

isCallerInRole()

getRollbackOnly()

setRollbackOnly()

getEJObject()

JNDI ENC contexts:

Properties java:comp/env

Resource Managers java:comp/env/jdbc

EJB references java:comp/env/ejb

EntityContext methods:

getEJHome()

getCallerPrincipal()

isCallerInRole()

getEJObject()

getUserTransaction()

JNDI ENC contexts:

Properties java:comp/env

Resource ...

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Publisher Resources

ISBN: 1565928695Catalog Page Errata

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Enterprise JavaBeans, Second Edition

by Richard Monson-Haefel

Session Beans

Stateless Session Beans

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