Win a copy of 97 Things Every Java Programmer Should Know this week in the Java in General forum!
  • 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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Paul Clapham
  • Jeanne Boyarsky
  • Junilu Lacar
  • Henry Wong
Sheriffs:
  • Ron McLeod
  • Devaka Cooray
  • Tim Cooke
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Frits Walraven
  • Tim Holloway
  • Carey Brown
Bartenders:
  • Piet Souris
  • salvin francis
  • fred rosenberger

A question form Sun's Free Proficiency Assessment System

 
Ranch Hand
Posts: 131
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator


20. Which method of the EntityManager API is used to control the life-cycle of an application-managed persistence context?
1, EntityManager.remove
2, EntityManager.refresh
3, EntityManager.joinTransaction
4, EntityManager.getReference


If the answer is 3?
 
Ranch Hand
Posts: 413
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
JPA Spec
3.1.1 EntityManager Interface
P.47
The methods close, isOpen, joinTransaction, and getTransaction are used to manage application-managed entity managers and their lifecycle.

Also If you only need to find the answer not the explanation, You can easily use elimination technique.
You must know the functionality of remove, refresh, getReference methods. neither is used to control the life cycle of em, then we can eliminate all 3. So answer is joinTransaction.
[ December 10, 2008: Message edited by: Chaminda Amarasinghe ]
 
Morning came much too soon and it brought along a friend named Margarita Hangover, and a tiny ad.
Devious Experiments for a Truly Passive Greenhouse!
https://www.kickstarter.com/projects/paulwheaton/greenhouse-1
    Bookmark Topic Watch Topic
  • New Topic