Spring Security 7 Crash Course [2026] – Everything You Need to Know

Published: 02 June 2026
on channel: Amigoscode

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Spring Security is one of those topics most developers never fully understand - until now. In this updated 2026 crash course, I'll teach you everything you need to get up and running with Spring Security 7 (on Spring Boot 4 and Java 25).

We cover the core architecture and the security filter chain, then implement real authentication step by step: Form Login, Basic Authentication, sessions & the JSESSIONID cookie, CSRF, the Authentication Manager & providers, custom UserDetailsService, and password encoding.

By the end you'll understand how Spring Security actually works under the hood — and be able to confidently put it on your CV and demonstrate it in interviews.

⭐ Get the full course + diagrams + source code: https://skool.com/amigoscode

💬 Join the free community to ask questions & grab resources: https://skool.com/amigoscode

🧰 Requirements:
• Java 25+
• Spring Boot 4
• Spring Security 7

📂 Source code & branches: https://github.com/amigoscode/spring-...

⏱️ TIMESTAMPS
00:00 Intro – what you'll learn
00:55 Spring Security architecture & the filter chain
07:14 Spring Security docs & versions (Spring Security 7)
10:49 Course repo & branches walkthrough
12:08 Requirements (Java 25, Spring Boot 4) & running the starter
16:42 Form Login – how it works (diagram)
20:38 Implementing Form Login (SecurityConfig)
27:38 Running the app & testing login
32:31 The JSESSIONID cookie explained
37:45 Storing sessions in Redis / JDBC
43:42 Customizing the login & logout
47:39 Exploring the filters in the source code
51:50 Basic Authentication – how it works (diagram)
56:10 Configuring Basic Auth (stateless + CSRF disabled)
1:01:54 Testing Basic Auth (browser, Base64, curl)
1:14:27 Realm name & WWW-Authenticate header
1:16:30 CSRF explained
1:18:45 Authentication Manager & Provider Manager
1:21:20 Debugging the DAO Authentication Provider
1:28:11 Custom users with UserDetailsService
1:36:11 Why login fails – the password encoder & NoOp
1:42:24 Password encoding & why we never store plain text
1:43:14 Wrap up

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🤝 Connect with me
• Skool: https://skool.com/amigoscode
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#springSecurity #springboot #java

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