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Java - Backend

Questions

Spring Beans9

Spring stereotype annotations
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Spring bean lifecycle
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Spring bean scopes
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@Configuration and @Bean
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@PostConstruct
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What is a Spring bean
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@Lazy
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Singleton bean thread safety
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Default bean scope
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JPA & Hibernate11

Hibernate persistence context
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Lazy vs eager loading
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N+1 query problem
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@OneToMany and @ManyToOne
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JpaRepository vs CrudRepository
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Spring Data repository
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JPA entity
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Hibernate dirty checking and flushing
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What is JPA
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What is Hibernate
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Hibernate L1 vs L2 cache
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Transactions6

@Transactional
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Transactional proxies and self-invocation
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Read anomalies (dirty, non-repeatable, phantom)
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Rollback-only transactions
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Transaction propagation
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Transaction isolation levels
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IoC & DI8

@Qualifier
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Spring IoC container
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@Autowired and dependency injection
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Component scanning
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Constructor vs setter injection
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@Value annotation
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ApplicationContext
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Spring application events
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Spring MVC5

@RestController vs @Controller
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@RequestMapping and @GetMapping
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DispatcherServlet
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Jackson
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DTO
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Build Tools1

Maven and Gradle
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Async & Scheduling2

@Async methods
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@Scheduled annotation
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