Dive into a comprehensive introduction to Spring Security in this 57-minute conference talk from Spring I/O 2019 in Barcelona. Explore defense-in-depth strategies and learn how to secure applications using open-source software. Follow along with live coding demonstrations as the speaker guides you through implementing various security measures, including request filtering, form-based authentication, password encoding, and authorization. Discover how to integrate OAuth2, create resource servers, work with JSON Web Tokens, and customize security configurations. Access accompanying slides and GitHub repository for additional resources and code examples. Gain practical insights into protecting applications from security breaches and implementing robust security measures using Spring Security.