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| Interview Questions and Answers for 'Dun' - 3 question(s) found - Order By Rating | ||||
 Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions. | ||||
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| Ans. A Class must override the hashCode method if its overriding the equals method. | ||||
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 Discuss Correct / Improve  java collections hashcode hash code equals collections  Asked in 44 Companies  intermediate  frequent | ||||
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 Related Questions | ||||
 Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object? | ||||
| Write a class and override the equals and hashcode method ? | ||||
| How many threads can access a concurrent hashmap when the hashcode is overridden and always returns a zero. | ||||
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| Ans. Lazy fetching is the technique of not loading the child objects when parent objects are loaded. By default Hibernate does not load child objects. One can specify whether to load them or not while doing the association. | ||||
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| Discuss Correct / Improve hibernate lazy fetching architecture Asked in 11 Companies frequent | ||||
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| Frequently asked question in companies using 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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| Discuss Correct / Improve hibernate lazy loading hibernate lazy initialization hibernate architecture Asked in 77 Companies Basic frequent | ||||
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| 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 | ||||
