• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

GWT + entities + JPA + DTO + Dozer

 
Ranch Hand
Posts: 563
Google Web Toolkit Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,
I am wondering what is the best way to handle mapping of entity beans (JPA 2) to DTOs.
Since you cannot use entity beans "directly" with GWT, you need to handle DTOs instead.

I have several entities with various relationships (OneToOne, OneToMany, ManyToMany with a join table etc).
Initially i started converting all entities to DTOs by hand with the help of a class MyEntityTransform.java with methods like :


Other methods are : persistent2BeanCollection(...), persistent2BeanMap(...), bean2Persistent(...), bean2PersistentCollection(...)

That becomes a fastidious task when handling collections, especially when the same entity has references to several other entities;

I have been thinking about using the DOZER framework to handle the mapping between entities and DTOs.
It is mentionned here : http://code.google.com/intl/fr/webtoolkit/articles/using_gwt_with_hibernate.html

However i am not sure how well it handles the various JPA mappings (manytomany for instance) and how much work it is to configure it in the dozer-bean-mappings.xml file.
Also i guess this framework is intensively using reflection to perform mapping operations. Such approach is much slower than mapping performed "by hands", e.g. when i use the methods in my MyEntityTransform.java class.

What do you suggest ? i'm interested in everybody's experience handling JPA entities with GWT.

Thanks.
 
author
Posts: 4335
39
jQuery Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Have you reviewed the new RequestFactory feature starting in GWT 2.1.0? The is still experimental but provides direct interactions with GWT + JPA.
reply
    Bookmark Topic Watch Topic
  • New Topic