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kuni katsuya

Hibernate - 0 views

what-when-how.com/...hibernate

java JPA Hibernate tutorial

shared by kuni katsuya on 13 Dec 12 - No Cached
  • what-when-how In Depth Tutorials and Information
  • Understanding object/relational persistence (Hibernate)
  • Mapping persistent classes (Hibernate)
  • ...5 more annotations...
  • Mapping collections and entity associations (Hibernate)
  • Advanced entity association mappings (Hibernate)
  • Inheritance and custom types (Hibernate)
  • Domain models and metadata (Hibernate)
  • Transactions and concurrency (Hibernate)
kuni katsuya

Inheritance and custom types (Hibernate) - 1 views

what-when-how.com/...nce-and-custom-types-hibernate

java JPA Hibernate InheritanceMapping

shared by kuni katsuya on 13 Dec 12 - No Cached
  • Choosing a strategy
  • You can apply all mapping strategies to abstract classes
  • and interfaces
  • ...8 more annotations...
  • Interfaces may have no state but may contain accessor method declarations, so they can be treated like abstract classes
  • Inheritance and custom types (Hibernate)
  • Mapping class inheritance
  • four different approaches to representing an inheritance hierarchy:
  • Table per concrete class with implicit polymorphism
  • Table per concrete class
  • Table per class hierarchy—
  • Table per subclass
kuni katsuya

Implementing the Builder Pattern using the Bean Validation API - Musings of a Programmi... - 0 views

musingsofaprogrammingaddict.blogspot.ca/...uilder-pattern-using-bean.html

database jpa EntityBeans BuilderPattern BeanValidation

shared by kuni katsuya on 03 Oct 12 - No Cached
  • invariants
  • customer's last name must not be null
  • must be between 3 and 80 characters long
  • ...23 more annotations...
  • @Size(min = 3, max = 80)
  • @NotNull
  • LastName
  • inner class Builder is in charge of creating Customer instances
  • mandatory fields – either primitive (e.g. id) or annotated with @NotNull (e.g. lastName) – are part of the builder's constructor
  • all optional fields setter methods on the builder are provided
  • newly created Customer instance is validated using the Validator#validate() method
  • impossible to retrieve an invalid Customer instance
  • extract the validation routine into a base class:
  • abstract class AbstractBuilder<T>
  • T build() throws ConstraintViolationException
  • protected abstract T buildInternal();
  • private static Validator validator
  • Concrete builder classes have to
  • extend AbstractBuilder
  • must implement the buildInternal() method:
  • Builder extends AbstractBuilder<Customer>
  • @Override protected Customer buildInternal()
  • Implementing the Builder Pattern using the Bean Validation API
  • variation of the Builder design pattern for instantiating objects with multiple optional attributes.
  • this pattern frees you from providing multiple constructors with the different optional attributes as parameters (hard to maintain and hard to read for clients)
  • or providing setter methods for the optional attributes
  • (require objects to be mutable, can leave objects in inconsistent state)
kuni katsuya

Java Persistence/Relationships - Wikibooks, open books for an open world - 0 views

en.wikibooks.org/...Relationships

jpa cascade CascadeType.PERSIST

shared by kuni katsuya on 11 Oct 12 - No Cached
  • Cascading
  • following operations can be cascaded, as defined in the CascadeType enum:
  • PERSIST
  • ...11 more annotations...
  • If persist() is called on the
  • parent
  • and the
  • child
  • is also new, it will also be persisted
  • MERGE
  • REFRESH
  • REMOVE
  • . If remove() is called on the parent then the child will also be removed
  • . If merge() is called on the parent, then the child will also be merged
  • If refresh() is called on the parent then the child will also be refreshed
kuni katsuya

Java Persistence/ManyToMany - Wikibooks, open books for an open world - 0 views

en.wikibooks.org/...ManyToMany

java JPA many-to-many @ManyToMany wikibooks book

shared by kuni katsuya on 23 Oct 12 - Cached
  • Bi-directional Many to Many
  • object model can choose if it will be mapped in both directions
  • in which direction it will be mapped
  • ...9 more annotations...
  • one direction must be defined as the owner and the other must use the mappedBy attribute to define its mapping
  • you will end up getting duplicate rows
  • If the mappedBy is not used, then the persistence provider will assume there are two independent relationships
  • As with all bi-directional relationships it is your object model's and application's responsibility to maintain the relationship in both direction
  • Mapping a Join Table with Additional Columns
  • solution is to create a class that models the join table
  • requires a composite primary key
  • To make your life simpler, I would recommend adding a generated Id attribute to the association class
  • Another usage is if you have a Map relationship between two objects, with a third unrelated object or data representing the Map key
    • kuni katsuya
      kuni katsuya on 23 Oct 12
       
      eg. map key = AuthorizationContext, map value = {Subject,Role}
kuni katsuya

Java Persistence/Persisting - Wikibooks, open books for an open world - 0 views

en.wikibooks.org/...Persisting

jpa persist merge remove find cascade

shared by kuni katsuya on 23 Oct 12 - No Cached
  • Persist
  • used to insert a new object into the database
  • it just registers it as new in the persistence context (transaction)
  • ...6 more annotations...
  • Merge
  • When the transaction is committed, or if the persistence context is flushed, then the object will be inserted into the database
  • used to merge the changes made to a detached object into the persistence context
  • it merges the changes into the persistence context (transaction)
  • When the transaction is committed, or if the persistence context is flushed, then the object will be updated in the database.
  • merge is only required when you have a detached copy of a persistence object
kuni katsuya

Hibernate - Many-to-Many example - join table + extra column (Annotation) - 0 views

www.mkyong.com/...-table-extra-column-annotation

jpa @ManyToMany n-ary

shared by kuni katsuya on 23 Oct 12 - No Cached
  • Many-to-Many example – join table + extra column (Annotation)
  • For many to many relationship with
  • NO extra column in the join table
  • ...1 more annotation...
  • please refer to this @many-to-many tutorial
kuni katsuya

Chapter 2. Mapping Entities - 0 views

docs.jboss.org/...entity.html

jpa CompositePrimaryKey @EmbeddedId @Id @IdClass @OneToOne @ManyToOne

shared by kuni katsuya on 24 Oct 12 - No Cached
  • Composite identifier
  • You can define a composite primary key through several syntaxes:
  • @EmbeddedId
  • ...66 more annotations...
  • map multiple properties as @Id properties
  • annotated the property as
  • map multiple properties as @Id properties and declare an external class to be the identifier type
  • declared on the entity via the @IdClass annotation
  • The identifier type must contain the same properties as the identifier properties of the entity: each property name must be the same, its type must be the same as well if the entity property is of a
  • basic type
  • last case is far from obvious
  • recommend you not to use it (for simplicity sake)
  • @EmbeddedId property
  • @EmbeddedId
  • @Embeddable
  • @EmbeddedId
  • @Embeddable
  • @Embeddable
  • @EmbeddedId
  • Multiple @Id properties
  • arguably more natural, approach
  • place @Id on multiple properties of my entity
  • only supported by Hibernate
  • does not require an extra embeddable component.
  • @IdClass
  • @IdClass on an entity points to the class (component) representing the identifier of the class
  • WarningThis approach is inherited from the EJB 2 days and we recommend against its use. But, after all it's your application and Hibernate supports it.
  • Mapping entity associations/relationships
  • One-to-one
  • three cases for one-to-one associations:
  • associated entities share the same primary keys values
  • foreign key is held by one of the entities (note that this FK column in the database should be constrained unique to simulate one-to-one multiplicity)
  • association table is used to store the link between the 2 entities (a unique constraint has to be defined on each fk to ensure the one to one multiplicity)
  • @PrimaryKeyJoinColumn
  • shared primary keys:
  • explicit foreign key column:
  • @JoinColumn(name="passport_fk")
  • foreign key column named passport_fk in the Customer table
  • may be bidirectional
  • owner is responsible for the association column(s) update
  • In a bidirectional relationship, one of the sides (and only one) has to be the owner
  • To declare a side as
  • not responsible for the relationship
  • the attribute
  • mappedBy
  • is used
  • mappedBy
  •  Indexed collections (List, Map)
  • Lists can be mapped in two different ways:
  • as ordered lists
  • as indexed lists
  • @OrderBy("number")
  • List<Order>
  • List<Order>
  • List<Order> 
  • To use one of the target entity property as a key of the map, use
  • @MapKey(name="myProperty")
  •  @MapKey(name"number")
  • Map<String,Order>
  • String number
    • kuni katsuya
      kuni katsuya on 24 Oct 12
       
      map key used in Customer.orders
  • @MapKeyJoinColumn/@MapKeyJoinColumns
  • if the map key type is another entity
  • @ManyToAny
  • 2.4.5.2. @Any
  • @Any annotation defines a polymorphic association to classes from multiple tables
  • this is most certainly not meant as the usual way of mapping (polymorphic) associations.
  • @ManyToAny allows polymorphic associations to classes from multiple tables
  • first column holds the type of the associated entity
  • remaining columns hold the identifier
  • not meant as the usual way of mapping (polymorphic) associations
kuni katsuya

Chapter 1. Getting Started - 0 views

www.graniteds.org/...graniteds.gettingstarted.html

graniteds helloworld ejb3

shared by kuni katsuya on 15 May 12 - No Cached
  • Hello World, revisited with EJB3
  • history is persisted in the database by means of a JPA entity bean and those objects are serialized back to the Flex client each time you enter a new name.
kuni katsuya

Chapter 10. Integration with CDI - 0 views

www.graniteds.org/...graniteds.ee6cdi.html

graniteds cdi integration

shared by kuni katsuya on 15 May 12 - No Cached
  • GraniteDS provides out-of-the-box integration with CDI via the Tide API
  • Integration with CDI
  • fully supports serialization of JPA entities from and to your Flex application, taking care of lazily loaded associations
  • ...3 more annotations...
  • GraniteDS also integrates with container security for authentication and role-based authorization
  • granite-cdi.jar
  • JBoss 6 and GlassFish v3
kuni katsuya

Spring to Java EE - A Migration Experience | OCPsoft - 0 views

ocpsoft.org/...tion-guide-cdi-jsf-jpa-jta-ejb

spring javaee migration

shared by kuni katsuya on 18 May 12 - No Cached
  • The biggest difference you’ll find is, “Java EE already does that for you.”
  • kuni katsuya on 18 May 12
     
    The biggest difference you'll find is, "Java EE already does that for you."
kuni katsuya

Around the World in Java: Deconstructing Spring myths - 0 views

hwellmann.blogspot.ca/...constructing-spring-myths.html

spring myths

shared by kuni katsuya on 25 May 12 - No Cached
  • the glory of Spring's founding myth of killing the beast that was J2EE seems to be fading. The former beast is now as manageable and easy to use as Spring ever was, or even more so
  • Deconstructing Spring myths
  • looking at the capabilities of the Spring Framework itself, where are the killer features?
  • ...4 more annotations...
  • list of reasons why I feel more productive on Java EE 6 than on Spring 3.1
  • these days there's really no reason for preferring vendor-specific APIs over JPA 2.0
  • Spring and Java EE applications mostly differ in the following areas only: the web framework (Spring MVC vs. JSF vs. Wicket vs. Vaadin vs. Struts vs.....) Spring Beans vs. EJB Spring Dependency Injection vs. CDI or Java EE 5 @EJB or @Resource injection
  • Spring MVC feels rather old-school
kuni katsuya

Around the World in Java: JBoss AS 7: Catching up with Java EE 6 - 1 views

hwellmann.blogspot.ca/...atching-up-with-java-ee-6.html

javaee6 appservers jbossas7 glassfish comparison

shared by kuni katsuya on 25 May 12 - No Cached
  • JBoss AS 7.0.2 (Full Profile)
  • JBoss AS 7, claiming to be lightning fast
  • Eclipse Integration
  • ...28 more annotations...
  • JBoss AS Tools
  • able to deploy my application directly from the workspace
  • bad news is that JBoss AS 7 does not currently support other persistence providers like Eclipselink, OpenJPA or DataNucleus
  • GlassFish and Resin, you can simply drop the JARs of your preferred provider and its dependencies in a designated folder of your server installation and edit your persistence.xml to override the default provider of the server
  • JBoss AS 7 appears to require an adapter per persistence provider, which to me looks like an unfortunate and unnecessary design decision
  • potential to take over the lead from GlassFish
  • documentation continues to be sketchy and far below the standard of JBoss AS 5
  • surprisingly lean and fast
  • top-level performance
  • classloader leaks
  • productivity issues of the Eclipse integration
  • lack of support for JPA providers other than Hibernate
  • Each of these is currently a blocker for using JBoss AS 7 in production
  • Redeployment
  • after a couple of redeployments, there was an OutOfMemoryError
  • new classloader leak
  • JBoss AS 7: Catching up with Java EE 6
  • Performance measurements
  • JBoss AS 7.0.2
  • GlassFish 3.1.1
  • Empty server startup time 1.9 s
  • 3.2 s
  • Empty server heap memory 10.5 MB
  • 26.5 MB
  • Empty server PermGen memory 36.3 MB
  • 28.4 MB
  • MyApp deployment time 5.8 s
  • JBoss AS 7 is now at a competitive level with Resin and Glassfish and actually outperforms Glassfish in almost all of these tests
kuni katsuya

Migrating from Spring to Java EE 6 - Part 4 | How to JBoss - 0 views

howtojboss.com/...rom-spring-to-java-ee-6-part-4

shared by kuni katsuya on 02 Jul 12 - No Cached
  • discuss the rationale for migrating your applications from Spring to Java EE 6 and show you real examples of upgrading the web UI, replacing the data access layer, migrating AOP to CDI interceptors, migrating JMX, how to deal with JDBC templates, and as an added bonus will demonstrate how to perform integration tests of you Java EE 6 application using Arquillian
  • EntityManagerClinicTest
  • There is also an interesting Arquillian Persistence extension that integrates DBUnit in Arquillian where you can define your test data externally
  • ...3 more annotations...
  • @RunWith(Arquillian.class)
  • JDBC Templates hardly give any abstraction on top of the database and you’re on your own for Object Relational Mapping. We strongly advise to use JPA wherever possible; it gives portability by abstracting most of the database specific SQL that you would need, and it does all the hard and painful work of object mapping
  • small part of your application
kuni katsuya

Persistence - Arquillian - Project Documentation Editor - 0 views

docs.jboss.org/...Persistence

jpa testing arquillian

shared by kuni katsuya on 03 Jul 12 - No Cached
  • Seeding database
  • Arquillian Persistence Extension is created to help you writing tests where persistence layer is involved
  • Comparing database state at the end of the test using given data sets
  • ...2 more annotations...
  •  @UsingDataSet("datasets/users.yml")
  •    @ShouldMatchDataSet("datasets/expected-users.yml")
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