Learn SPRING-SECURITY with Real Code Examples

Updated Nov 27, 2025

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Installation Setup

Add `spring-boot-starter-security` dependency to project

Configure WebSecurityConfigurerAdapter (Spring Boot 2) or SecurityFilterChain (Spring Boot 3)

Define authentication providers (in-memory, JDBC, LDAP, OAuth2, etc.)

Secure endpoints using HTTP security or method-level annotations

Run application and verify authentication/authorization

Environment Setup

Install Java JDK 17+

Add Spring Boot and Security dependencies

Configure authentication and authorization

Run and verify app locally

Integrate with external identity providers if needed

Config Files

application.properties/yml - security settings

pom.xml/gradle.build - dependencies

src/main/java/.../security - config and filters

src/main/java/.../service - user auth logic

src/main/java/.../controller - secured endpoints

Cli Commands

./mvnw spring-boot:run - run app

mvn clean install - build project

gradlew bootRun - for Gradle builds

mvn test - run unit/integration tests

mvn dependency:tree - view dependency tree

Internationalization

Error and login messages externalized for i18n

Supports locale-specific messages via MessageSource

UTF-8 encoding by default

Customizable security messages per language

Integrate with Spring MVC i18n support

Accessibility

Endpoints secured via roles/permissions

CSRF tokens included in forms for web security

Ensure APIs handle authentication errors gracefully

Error responses should not leak sensitive info

Integrate with accessibility-compliant front-end frameworks

Ui Styling

Form-based login pages can be styled via Thymeleaf or JSP

Error pages for unauthorized access

Optional SPA integration with REST APIs

Custom login/logout pages configurable

Minimal UI concern; mostly backend-focused

State Management

SecurityContext stores per-request authentication

Sessions can be stateful or stateless

JWT tokens for stateless REST APIs

Method-level security accesses SecurityContext

Filters manage request lifecycle and auth state

Data Management

UserDetailsService retrieves user info from DB or LDAP

Roles/authorities mapped to endpoints

PasswordEncoder ensures secure storage

Optional caching of authentication info