JPA Interview Questions

Q1 How to fetch children in JPA with association? ✓ Answered → Q2 What is the difference between Lazy and Eager fetching? ✓ Answered → Q3 When should we use Lazy loading vs Eager loading? ✓ Answered → Q4 How can you fetch a LAZY association as EAGER in a NamedQuery? ✓ Answered → Q5 What is NamedEntityGraph? ✓ Answered → Q6 Explain entity states in JPA and the transitions between them. ✓ Answered → Q7 Explain what the merge() method does in JPA and how it differs from persist(). ✓ Answered → Q8 What is the difference between merge() and update() in Hibernate? ✓ Answered → Q9 What is Flush Mode in JPA and how does it affect persistence context synchronization? ✓ Answered → Q10 How can you tune Hibernate or JPA for high throughput systems? ✓ Answered → Q11 What is StatelessSession in Hibernate and when would you use it for bulk migration? ✓ Answered → Q12 Explain composite keys in JPA and how they are implemented. ✓ Answered → Q13 How do you implement composite keys using Spring Data JPA repositories? ✓ Answered → Q14 Explain the different inheritance mapping strategies in JPA. ✓ Answered → Q15 What are Hibernate event listeners and when are they used? ✓ Answered → Q16 How do you configure Ehcache as a second-level cache provider in Hibernate or JPA? ✓ Answered → Q17 How can Redis be used as a second-level cache provider in Hibernate or JPA? ✓ Answered → Q18 Where is cache stored in JPA when second-level caching is enabled? ✓ Answered → Q19 When using Ehcache as a second-level cache, where is the cache stored and how is it managed? ✓ Answered → Q20 What is the difference between JOIN FETCH and Entity Graph in JPA? ✓ Answered →