S04L07 – Spring security login, overide loadUserByUsername
Implementing and Debugging Spring Security Login in a Spring Boot Application Table of Contents
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1. <a href="#introduction-to-spring-security-login">Introduction to Spring Security Login</a> ..........................................................................................................................................1
2. <a href="#common-issues-in-spring-security-login-implementation">Common Issues in Spring Security Login Implementation</a> ............................................................................................................................2
2.1. <a href="#ui-issues-fixing-the-login-page">UI Issues: Fixing the Login Page</a> ...........................................................................................................................................2
2.2. <a href="#backend-issues-missing-name-attributes-in-form-elements">Backend Issues: Missing 'name' Attributes in Form Elements</a> ..................................................................................................................................................3
3. <a href="#implementing-userdetailservice-in-spring-security">Implementing UserDetailsService in Spring Security</a> .........................................................................................................................................4
3.1. <a href="#overview-of-userdetailservice">Overview of UserDetailsService</a> ........................................................................................................................................4
3.2. <a href="#implementing-loaduserbyusername-method">Implementing <strong>loadUserByUsername</strong> Method</a> ........................................................................................................................................5
4. <a href="#handling-granted-authorities-and-roles-in-spring-security">Handling Granted Authorities and Roles in Spring Security</a> ...................................................................................................................................................6
4.1. <a href="#understanding-granted-authority">Understanding Granted Authority</a> ........................................................................................................................................6
4.2. <a href="#configuring-granted-authorities">Configuring Granted Authorities</a> ........................................................................................................................................7
5. <a href="#debugging-spring-security-login-errors">Debugging Spring Security Login Errors</a> ........................................................................................................................................8
5.1. <a href="#common-errors-and-their-causes">Common Errors and Their Causes</a> ..........................................................................................................................................8
5.2. <a href="#debugging-techniques-in-spring-boot">Debugging Techniques in Spring Boot</a> ..........................................................................................................................................9
6. <a href="#testing-the-login-functionality">Testing the Login Functionality</a> ..................................................................................................................................................10
6.1. <a href="#running-the-application-in-debug-mode">Running the Application in Debug Mode</a> ..........................................................................................................................................10
6.2. <a href="#verifying-successful-login">Verifying Successful Login</a> ........................................................................................................................................................11
7. <a href="#conclusion-and-best-practices">Conclusion and Best Practices</a> ................................................................................................................................................12
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Introduction to Spring Security Login Spring Security is a powerful and highly customizable authentication and access-control framework for the Spring ecosystem. Implementing a secure login…