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Java & Spring

89 courses 9 categories

Part of Learn Programming

Java and the Spring ecosystem together form the workhorse of enterprise backend development — banks, insurance, telecom, retail, and the public sector. The topic covers the language (Java 17 / 21 LTS), the Spring Framework family (Spring Boot, Spring Data, Spring Security, Spring Cloud), the persistence layer (Hibernate / JPA), and the Maven build tooling that ties it all together.

Java in 2026 is not the Java of 2010. Records, sealed classes, pattern matching, virtual threads (Project Loom), and the new HTTP client modernized the language considerably. Spring Boot 3.x runs on Jakarta EE 9+ namespaces, supports native compilation via GraalVM for fast startup, and ships sensible defaults for observability, configuration, and security. The Spring ecosystem still favours convention over fragmentation, which is why so much of the enterprise backend market sits here.

What you'll find under this topic

  • Modern Java: records, sealed types, pattern matching, virtual threads, the new HTTP client
  • Spring Boot: auto-configuration, starters, profiles, Actuator, native image with GraalVM
  • Spring MVC and WebFlux for REST APIs and reactive services
  • Spring Data: JPA, repositories, query methods, Spring Data JDBC, MongoDB
  • Hibernate ORM: entities, fetch strategies, caching, N+1 avoidance
  • Spring Security: authentication, OAuth2, JWT, method security, OIDC
  • Spring Cloud: service discovery, config server, gateway, resilience patterns
  • Maven and Gradle: dependency management, multi-module projects, CI integration

Java + Spring skills hire across nearly every Fortune 500: banks (JPMorgan, Goldman, every European retail bank), insurance, telecom operators, large e-commerce (Amazon, eBay, Alibaba), government and the public sector, plus the long tail of system-integrator and consulting work. Roles include backend engineer, senior / staff Java engineer, integration engineer, and platform engineer running shared Spring-based libraries across many teams.

Categories (9)

Hibernate ORM thumbnail
Hibernate ORM
Hibernate ORM is the Java object-relational mapper that became the reference implementation of the JPA standard. Most…
Java thumbnail
Java
Java is a statically-typed, object-oriented language that has powered enterprise backends since 1995 and is currently…
Maven thumbnail
Maven
What Maven Does Apache Maven is a build tool for Java projects. You use it to manage project builds in a clear and…
Spring thumbnail
Spring
Spring is one of the most widely used frameworks for developing enterprise applications, providing a robust programming…
Spring Boot thumbnail
Spring Boot
Spring Boot is an opinionated layer on top of the Spring Framework that removes the XML and the boilerplate. Pivotal…
Spring Cloud thumbnail
Spring Cloud
Spring Cloud provides tools for developers to quickly build some of the common patterns in distributed systems (e.g…
Spring Data thumbnail
Spring Data
Spring Data’s mission is to provide a familiar and consistent, Spring-based programming model for data access while…
Spring MVC thumbnail
Spring MVC
Spring MVC is the original Spring web framework — the servlet-based request/response model with controllers, views, and…
Spring Security thumbnail
Spring Security
Spring Security is the authentication and authorization framework for Spring applications. It handles every common…

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Frequently asked questions

Is Java still relevant in 2026?
Very much so. Java runs an enormous share of enterprise systems — banking, insurance, telecom, healthcare, large e-commerce — and the language itself has caught up with modern features (records, pattern matching, sealed types, virtual threads). Spring Boot is the dominant framework. Pay is strong, demand is stable, and the codebases are typically long-lived which makes the skills durable.
Spring Boot vs Quarkus vs Micronaut?
Spring Boot is the default for almost every Java job. Quarkus and Micronaut shine for serverless and low-startup-time workloads using GraalVM native image. Pick Spring Boot for maximum job-market fit; learn one of the alternatives as a second tool if you target cloud-native or serverless Java specifically — those niches pay well but hire less often.
Should I learn Kotlin instead of Java?
Kotlin is a fully-supported JVM language with better ergonomics, used heavily for Android and increasingly for server-side at companies like Expedia, Allegro, and DoorDash. Most JVM jobs still list Java first; learning Java initially gives broader market access, then picking up Kotlin in a week or two when a team uses it works well.
What about virtual threads — do they change everything?
They simplify a lot. Project Loom's virtual threads let you write blocking-style code that scales like async without callback hell or reactive operators. Many Spring teams are migrating away from WebFlux back to standard blocking controllers on virtual threads. Worth understanding deeply; reactive Java skills (Reactor, RxJava) remain valuable in existing codebases.
How long does it take to become productive in Spring Boot?
1–2 months for a Java developer to ship real Spring Boot services; 4–6 months from a cold start. The framework's surface is huge (Security, Data JPA, transactions, profiles, configuration, observability) but the day-to-day patterns are well-documented. Mastery of the more obscure corners (custom auto-configuration, conditional beans) accrues over years.

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