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kuni katsuya

java - what is difference between EntityManager.find() and EntityManger.getReference()? - Stack Overflow - 0 views

stackoverflow.com/...-and-entitymanger-getreference

java JPA EntityManager find getReference

shared by kuni katsuya on 20 Nov 12 - No Cached
  • what is difference between EntityManager.find() and EntityManger.getReference()?
  • find()
  • return an initialized instance of your object
  • ...6 more annotations...
  • If it is not already loaded in the EntityManager, it is retrieved from the database
  • getReference()
  • is allowed to return a proxy instread of an initialized instance, if the entity has not been loaded in the EntityManager before
  • In this proxy,
  • only the primary key attribute is initialized
  • Proxies can be created without hitting the database
kuni katsuya

VineetReynolds / Java EE 6-Galleria / wiki / DataModel - Bitbucket - 1 views

bitbucket.org/...DataModel

javaee6 example jpa ejb jsf junit4 arquillian DomainDrivenDesign ddd DataModel

shared by kuni katsuya on 21 Nov 12 - No Cached
  • Many users can be associated with a group
    • kuni katsuya
      kuni katsuya on 21 Nov 12
       
      user:group = n:m (ie. many-to-many)
  • Groups
  • groupId.
  • ...5 more annotations...
  • A User
  • userId
  • Users can have many Albums
    • kuni katsuya
      kuni katsuya on 21 Nov 12
       
      user:album = 1:n
  • Album containing Photos
    • kuni katsuya
      kuni katsuya on 21 Nov 12
       
      album:photo = 1:n
  • Physical Data Model
    • kuni katsuya
      kuni katsuya on 21 Nov 12
       
      ie. er model in database
  • kuni katsuya on 21 Nov 12
     
    Logical Data Model
kuni katsuya

Dependency injection discourages object-oriented programming? @ Blog of Adam Warski - 0 views

www.warski.org/...es-object-oriented-programming

java javaee6 CDI CdiDependencyInjection OO Object-Oriented procedural DI DependencyInjection

shared by kuni katsuya on 12 Dec 12 - No Cached
  • Dependency injection discourages object-oriented programming?
  • if you’re using DI, and you have an X entity, do you have an XService or XManager with lots of method where X is the first argument?
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      evidence of the anti-pattern of procedural design in a java ee6 cdi application
  • previous way is more procedural
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      ie. ProductService.ship(Product,Customer)
  • ...12 more annotations...
  • service/manager is a set of procedures you can run, where the execution takes a product and a customer as arguments
  • better
  • OO approach
  • not saying that achieving the above is not possible with a DI framework
  • only that DI
  • encourages the ProductService approach
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      well, dependency injection, but moreover, the soa approach to service design tends to force otherwise intelligent software engineers into doing procedural design the services just end up being bags of method calls that implement any type of behavior, with the domain objects or entity beans being reduced to mere data structures with little responsibility or behavior beyond persistence. (which, in this anti-pattern, is typically mostly provided by the repository or dao class! ie. domain object crud)
  • it’s just easier
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      ... if you just blindly follow the anti-pattern, of course  ;)
  • many benefits
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      with the procedural approach, you also cannot implement polymorphic behavior, for instance
  • builder
  • fluent interface
  • it’s not for small projects
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      fuckwhat? small or big matters not. if di is applied poorly, regardless of project size, it's an anti-pattern! disregard these comments!
  • problems with DI frameworks:
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      not sure i agree with these points, but will refuse in a later sticky note
kuni katsuya

Listing Directory Contents with JDK 1.7 and NIO.2 : Adam Bien's Weblog - 0 views

www.adam-bien.com/...ng_directory_contents_with_jdk

java lazy-loading java7 NIO.2

shared by kuni katsuya on 12 Dec 12 - No Cached
kuni katsuya

jsonschema2pojo - 0 views

www.jsonschema2pojo.org

JSON JSONSchema Java CodeGeneration

shared by kuni katsuya on 20 Mar 13 - No Cached
  • Generate Plain Old Java Objects from JSON or JSON-Schema.
kuni katsuya

fernandezpablo85/scribe-java · GitHub - 0 views

github.com/...scribe-java

shared by kuni katsuya on 27 Mar 13 - No Cached
  • Configuring scribe
    • kuni katsuya
      kuni katsuya on 27 Mar 13
       
      fluent builder-style api
kuni katsuya

Getting Started · UnquietCode/Flapi Wiki - 0 views

github.com/...Getting-Started

Java generics FluentAPI DesignPatterns ApiDesign builder Flapi intro

shared by kuni katsuya on 27 Mar 13 - No Cached
  • UnquietCode / Flapi
  • Getting Started
  • include a block chain
  • ...29 more annotations...
  • builds what is called a descriptor
  • blocks
  • methods
  • Blocks can be reused by using their name later in a addBlockReference(...) method
  • block contains methods
  • block can in turn nest other blocks
  • last()
  • Invocation Tracking
  • allowed invocations:
  • any()
  • exactly(int x)
  • atLeast(int x)
  • atMost(int x)
  • uses to build the Java code model and generate the classes and interfaces of a builder
  • between(int x, int y)
  • last(Class c)
  • Creating a Descriptor
  • Flapi.builder()
  • setPackage(String)
  • setStartingMethodName(String)
  • setDescriptorName(String)
  • setReturnType(Class)
  • enableCondensedClassNames()
  • addMethod(...)
  • startBlock(...)
  • addBlockChain(...)
  • addBlockReference(...)
  • Implementing the Helpers
  • Flapi creates only the interfaces for the helpers
kuni katsuya

Getting Started with JSON-P (The Aquarium) - 0 views

blogs.oracle.com/...getting_started_with_json_p

javaee7 JSON JSON-P JAX-RS

shared by kuni katsuya on 27 Mar 13 - No Cached
  • JSON-P is now in the proposed final draft stage
    • kuni katsuya
      kuni katsuya on 27 Mar 13
       
      now == 2013.03.25
  • Getting Started with JSON-P
  • Mar 25, 2013
  • ...4 more annotations...
  • JSON-P
  • new API being added to Java EE 7
  • Java API for JSON Processing
  • API to enable developers to parse, generate, transform and query JSON, particularly in JAX-RS and WebSocket powered next-generation HTML 5 applications
kuni katsuya

Polymorphism and Interfaces: Chapter 7 of Objects and Java - 0 views

www.artima.com/...PolymorphismInterfaces1.html

java Interface NamingConvention BestPractices

shared by kuni katsuya on 19 Dec 12 - No Cached
  • Interface Naming Conventions
  • leave off redundant modifiers in member declarations of interfaces
  • either a noun or noun phrase
  • ...3 more annotations...
  • if you are using the interface to represent an abstract base class
  • adjective
  • if you are using the interface to represent a behavior
kuni katsuya

Advanced Searching - JIRA 5.1 - Atlassian Documentation - Confluence - 0 views

confluence.atlassian.com/...Advanced+Searching

jira search

shared by kuni katsuya on 04 Feb 13 - No Cached
  • It is safer to search by Custom Field ID than by Custom Field nameIt is possible for a Custom Field to have the same name as a built-in JIRA system field, in which case JIRA will search on the system field (not your custom field). It is also possible for your JIRA administrator to change the name of a Custom Field, which could break any saved filters which rely on that name. Custom Field IDs, however, are unique and cannot be changed.
  • Custom Field
  • It is safer to search by filter ID than by filter nameIt is possible for a filter name to be changed, which could break a saved filter that invokes another filter by name. Filter IDs, however, are unique and cannot be changed.
  • ...3 more annotations...
  • Alias: ?cf[CustomFieldID]
  • An Advanced Searching statement in your typed query will override an ORDER BY statement in the saved filter.
  • Original Estimate
kuni katsuya

Release Notes - GraniteDS - Version 3.0.0.M1 - HTML format - Granite Data Services - 0 views

www.graniteds.org/...ReleaseNote.jspa

java javaee javaee6 graniteds GraniteDS3 ReleaseNotes

shared by kuni katsuya on 13 Dec 12 - No Cached
  • Release Notes - GraniteDS - Version 3.0.0.M1
  • GAS3 does not handle Java generics with abstract class implementations
  • Generated as3 has compilation warnings: missing constructor
  • ...1 more annotation...
  • Rename flex-filter to server-filter and @FlexFilter to @ServerFilter
kuni katsuya

Advanced entity association mappings (Hibernate) - 0 views

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

java JPA AssociationMapping TernaryAssociation PolymorphicAssociation

shared by kuni katsuya on 13 Dec 12 - No Cached
  • Ternary associations
  • Figure 7.12 A ternary association with a join table between three entities
  • Polymorphic associations
  • ...11 more annotations...
  • Polymorphic many-to-one associations
  • Polymorphic collections
  • Polymorphic associations to unions
  • Polymorphic table per concrete class
  • Fully polymorphic behavior is available, but there is no annotation support for any mappings.
  • Hibernate supports fully polymorphic behavior. It provides extra support for any association mappings to an inheritance hierarchy mapped with implicit polymorphism.
  • Hibernate Core
  • Table 7.1 Hibernate and JPA comparison chart
  • Java Persistence and EJB 3.0
  • Advanced entity association mappings (Hibernate)
  • Mapping maps
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
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