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Interview Questions and Answers for 'IRIS Software' - 3 question(s) found - Order By Newest

Frequently asked question in companies using Hibernate.
  Q1. What is Lazy Initialization in Hibernate ?Hibernate
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Ans. It's a feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded.

  Sample Code for Lazy Initialization

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   Like         Discuss         Correct / Improve     hibernate   lazy loading hibernate   lazy initialization hibernate   architecture     Asked in 77 Companies      Basic        frequent

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Related Questions

  What are the ways to avoid LazyInitializationException ?
  After which Hibernate version , related Entities are initialized lazily ?
 What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?
 How does Lazy Initialization helps improving performance of an application ?
 What does the following exception means

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
 If you are given choice to avoid LazyInitializationException using any of the following measures, which are the ones you will choose and why ?

1. Set lazy=false in the hibernate config file.
2. Set @Basic(fetch=FetchType.EAGER) at the mapping.
3. Make sure that we are accessing the dependent objects before closing the session.
4. Force initialization using Hibernate.initialize


 Q2. Can we have foreign key reference to a non primary key column ?Database
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Ans. Yes, but the respective key in the foreign table should be declared Unique.

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   Like         Discuss         Correct / Improve     sql   database   oracle     Asked in 2 Companies


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  If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ?
 What is ACID ?
  What is the use of @GeneratedValue annotation in Hibernate?
 What happens to backups if we delete the RDS instance ?
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 Q3. What is ConcurrentModificationException ?Core Java
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Ans. This is the exception that is thrown when we try to modify the non concurrent collection class while iterating through it.

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   Like         Discuss         Correct / Improve     java   collections   concurrentmodificationexception   exception  concurrency     Asked in 14 Companies      intermediate


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