This section focuses on Java exception handling concepts including checked and unchecked exceptions, try-catch-finally, custom exceptions, transaction rollback behavior, resource management, and best practices for building reliable enterprise backend applications.
This section focuses on Java Stream API concepts including functional programming, lazy evaluation, stream operations, Optional, lambda expressions, collectors, parallel streams, and common performance considerations in modern Java applications.
This section focuses on Java concurrency and multithreading concepts, including threads, synchronization, thread safety, race conditions, locks, concurrent collections, thread pools, and modern concurrency features such as virtual threads in Java 21.
This section focuses on core Java concepts including JVM internals, memory management, collections, concurrency, exceptions, streams, generics, multithreading, and modern Java features commonly used in enterprise backend development.
This section focuses on core Object-Oriented Programming concepts in Java, including encapsulation, inheritance, polymorphism, abstraction, interfaces, composition, SOLID principles, and how OOP supports scalable and maintainable backend application design.
This section focuses on real JPA problems that often appear in backend interviews, including lazy loading, N+1 queries, transactions, cascading, concurrency, pagination, rollback issues, and production database behavior.
This section focuses on designing backend systems with real production concerns, including authentication, transactions, scalability, reliability, consistency, retries, rate limiting, pagination, idempotency, and distributed system patterns.
This section focuses on Kafka fundamentals, including topics, partitions, consumer groups, message delivery guarantees, event-driven architecture, serialization, failure handling, and how Kafka integrates with Spring Boot in distributed systems.
This section focuses on Spring Security fundamentals, including authentication, authorization, JWT-based security, password protection, endpoint security, filters, and how modern Spring Boot applications secure REST APIs.
