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Spring Security

You're reading from   Spring Security Secure your web applications, RESTful services, and microservice architectures

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781787129511
Length 542 pages
Edition 3rd Edition
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Authors (3):
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Robert Winch Robert Winch
Author Profile Icon Robert Winch
Robert Winch
Peter Mularien Peter Mularien
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Peter Mularien
Mick Knutson Mick Knutson
Author Profile Icon Mick Knutson
Mick Knutson
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Toc

Table of Contents (19) Chapters Close

Preface 1. Anatomy of an Unsafe Application FREE CHAPTER 2. Getting Started with Spring Security 3. Custom Authentication 4. JDBC-Based Authentication 5. Authentication with Spring Data 6. LDAP Directory Services 7. Remember-Me Services 8. Client Certificate Authentication with TLS 9. Opening up to OAuth 2 10. Single Sign-On with the Central Authentication Service 11. Fine-Grained Access Control 12. Access Control Lists 13. Custom Authorization 14. Session Management 15. Additional Spring Security Features 16. Migration to Spring Security 4.2 17. Microservice Security with OAuth 2 and JSON Web Tokens 18. Additional Reference Material

Common problems with concurrency control

There are a few common reasons that logging in with the same user does not trigger a logout event. The first occurs when using custom UserDetails (as we did in Chapter 3, Custom Authentication) while the equals and hashCode methods are not properly implemented. This occurs because the default SessionRegistry implementation uses an in-memory map to store UserDetails. In order to resolve this, you must ensure that you have properly implemented the hashCode and equals methods.

The second problem occurs when restarting the application container while the user sessions are persisted to a disk. When the container has started back up, the users who were already logged in with a valid session are logged in. However, the in-memory map of SessionRegistry that is used to determine if the user is already logged in will be empty. This means that Spring...

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