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Interview Questions and Answers for 'Lazy initialization' - 9 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.

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 Q2. What are the ways to avoid LazyInitializationException ?Hibernate
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Ans. 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

5. Using Fetch Join in HQL.

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 Q3. After which Hibernate version , related Entities are initialized lazily ?Hibernate
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Ans. After Hibernate 3.0

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 Q4. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?Hibernate2017-01-20 16:00:11

Ans. Make sure that the properties of dependent Hibernate entities are not accessed and if yes, better wrap the whole code within single transaction.

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 Q5. How does Lazy Initialization helps improving performance of an application ?Hibernate2017-01-20 16:18:52

Ans. Lazy Initialization means , Load Dependencies when required. Which means less load on application resources as only required data is loaded upfront. It's not only good for better performance but for better resource utilization too.

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 Q6. What does the following exception means

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
Hibernate2017-02-16 11:28:15

Ans. The error states that Hibernate is not able to initialize proxy / dependent entity objects as there is no session or transaction present. Very likely we are trying to load the dependent entities lazily but the call to dependent object property is not wrapped within the session or transaction.

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 Q7. 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
Hibernate2017-02-16 13:32:41

Ans. First resolution is a big No as it conveys no lazy loading in complete app. even second is advocating the same but for a particular mapping.

third one is most appropriate if loading and dependent entity property access is closer to each other in code and can be accomplished.

I don't mind using 4th too.

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 Q8. What is Lazy Initialization in Hibernate ?Hibernate
a. Feature to load the dependencies from Cache
b. Feature to load all objects and relationships in advance before they can be used
c. Feature to not load dependencies and relationship in advance and load when required
d. Feature to not load the dependencies and relationships at all

Ans.c. Feature to not load dependencies and relationship in advance and load when required

 Q9. Which of the following is not the benefit of Lazy Initialization in Hibernate ?Hibernate
a. Laod When required provides better performance
b. Object stays lighter
c. Less number of Database calls
d. Less load on Database

Ans.c. Less number of Database calls



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