Flexible path9 sections

Java & Spring Backend

Java and Spring Boot interview preparation grounded in real backend work.

A backend-focused Java and Spring preparation path covering language fundamentals, the JVM, collections, concurrency, Spring Boot, web APIs, persistence, security, testing, reliability, and production diagnosis.

Recommended start

Java Language & Object Model

Java execution, values and references, identity and equality, object-oriented design, modern data types, exceptions, and resource ownership.

24 drillsSection 1 of 9

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Learning path

9 active sections / 204 drills

1Java Language & Object ModelRecommended startJava execution, values and references, identity and equality, object-oriented design, modern data types, exceptions, and resource ownership.24 drillsSection 1Open section 2Java Collections, Generics & StreamsCollection choice, hashing, generics, wildcards, lambdas, stream execution, Optional, and practical data transformation.24 drillsSection 2Open section 3JVM Memory & ConcurrencyMemory and garbage collection, thread safety, executors, futures, locks, concurrent collections, virtual threads, and runtime diagnosis.24 drillsSection 3Open section 4Spring Core & BootDependency injection, bean lifecycle and scope, configuration, auto-configuration, application startup, and framework boundaries.24 drillsSection 4Open section 5Spring Web APIs & ValidationSpring MVC request flow, controllers, validation, errors, serialization, filters, and reliable HTTP API boundaries.24 drillsSection 5Open section 6JPA, Hibernate & TransactionsPersistence context, entity state, fetching, query behavior, transaction boundaries, locking, migrations, and production data access.24 drillsSection 6Open section 7Spring Security & TestingSecurity filter chains, authentication and authorization, unit and integration boundaries, test slices, and reliable test suites.24 drillsSection 7Open section 8Java Production Reliability & ObservabilityTimeouts, retries, health, metrics, traces, deployment behavior, incident diagnosis, and resilient Spring services.24 drillsSection 8Open section 9Java & Spring Practical LabsWorked Java and Spring implementation exercises covering language design, concurrency, APIs, JPA, security, testing, and production correctness.12 drillsSection 9Open section