easyjpaannotationsmapping@Entity, @Table, @Column annotationsWhat do the @Entity, @Table, and @Column annotations do in JPA?▾
easyjpalifecyclefundamentalsEntity lifecycle statesWhat are the four lifecycle states of a JPA entity?▾
easyspring-datarepositoriesfundamentalsSpring Data JPA repository interfacesWhat are CrudRepository, JpaRepository, and PagingAndSortingRepository? When would you use each?▾
easyjpafetchperformanceEAGER vs LAZY fetch typesWhat is the difference between FetchType.EAGER and FetchType.LAZY in JPA?▾
easyspringtransactionsfundamentals@Transactional basicsWhat does the @Transactional annotation do in Spring?▾
mediumjparelationshipsmappingJPA relationship annotationsExplain @OneToMany, @ManyToOne, and @ManyToMany with bidirectional vs unidirectional mappings.▾
mediumhibernaten+1performancejpqlN+1 problem and solutionsWhat is the N+1 select problem in Hibernate and what are the main ways to solve it?▾
mediumjpqlcriteria-apinative-queryspring-dataJPQL vs Criteria API vs native queriesCompare JPQL, the Criteria API, and native SQL queries in Spring Data JPA.▾
mediumspring-datarepositoriesjpqlquery-methodsSpring Data derived query methods and @QueryHow do derived query method names work in Spring Data JPA, and when should you use @Query instead?▾
mediumspringtransactionspropagationTransaction propagation levelsExplain the transaction propagation levels available in Spring's @Transactional annotation.▾
mediumjpalockingconcurrencyversionOptimistic locking with @VersionWhat is optimistic locking in JPA and how do you implement it with @Version?▾
mediumjpalockingconcurrencydatabasePessimistic locking in JPAHow does pessimistic locking work in JPA and when would you use it?▾
mediumhibernatecacheperformanceHibernate second-level cacheWhat is the Hibernate second-level cache and how does it differ from the first-level cache?▾
mediumhikaricpconnection-poolingspring-bootperformanceConnection pooling with HikariCPHow does HikariCP work in Spring Boot and what are the key configuration properties?▾
mediumjpacascaderelationshipshibernateJPA cascade typesWhat are JPA cascade types and when should you use CascadeType.ALL vs specific cascade operations?▾
hardhibernatedirty-checkingperformanceinternalsHibernate dirty checking mechanismHow does Hibernate's automatic dirty checking work, and what are its performance implications?▾
hardhibernatespringosivanti-patternperformanceOpen Session in View anti-patternWhat is the Open Session in View pattern, why is it considered an anti-pattern, and how do you disable it?▾
hardspring-dataspecificationscriteria-apidynamic-querySpring Data SpecificationsWhat are Spring Data JPA Specifications and how do you use them for dynamic queries?▾
hardflywayliquibasemigrationsspring-bootFlyway vs Liquibase for database migrationsCompare Flyway and Liquibase for managing database schema migrations in a Spring Boot application.▾
hardjpainheritancemappinghibernateJPA inheritance mapping strategiesWhat are the JPA inheritance mapping strategies and what are the trade-offs of each?▾
hardjpaentity-graphperformancefetch@EntityGraph for controlling fetch plansWhat is @EntityGraph in JPA, how do you define one, and when should you use it over JOIN FETCH?▾
hardspring-databulk-operationsperformancehibernateBulk updates and deletes in Spring Data JPAHow do you perform efficient bulk updates and deletes in Spring Data JPA, and what pitfalls should you watch for?▾
hardspring-dataprojectionsdtoperformanceSpring Data projectionsWhat types of projections does Spring Data JPA support and when would you use each?▾
hardtransactionsisolationdatabaseconcurrencyTransaction isolation levelsExplain the four SQL transaction isolation levels and the concurrency anomalies they prevent.▾