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How to Fix LazyInitializationException in Spring Boot with SecurityContextHolder

Learn how to efficiently handle `LazyInitializationException` in Spring Boot when fetching user authentication via `SecurityContextHolder`. This guide details the steps using `CustomUserDetails` for improved session management. --- This video is based on the question https://stackoverflow.com/q/77818477/ asked by the user 'jcleow' ( https://stackoverflow.com/u/14564427/ ) and on the answer https://stackoverflow.com/a/77833873/ provided by the user 'jcleow' ( https://stackoverflow.com/u/14564427/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, comments, revision history etc. For example, the original title of the Question was: Adding Transactional to fix LazyInitializationException when fetching SecurityContextHolder.getContext().getAuthentication() doesnt work Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Resolving LazyInitializationException When Using SecurityContextHolder in Spring Boot When working with Spring Boot, developers may often encounter what is known as a LazyInitializationException. This commonly occurs when trying to access lazily loaded collections outside of an active Hibernate session. A frequent situation that leads to this exception is when fetching user authentication with SecurityContextHolder, specifically in relation to user details through filters. This guide will explore a typical scenario where you may encounter this issue and provide a step-by-step solution. The Problem: Understanding LazyInitializationException In a recent development experience, I faced the issue while trying to retrieve user details using the following code snippet: [[See Video to Reveal this Text or Code Snippet]] This code is executed in a Spring Boot Controller: [[See Video to Reveal this Text or Code Snippet]] The Encountered Error While debugging, the error log displayed the following message: [[See Video to Reveal this Text or Code Snippet]] This indicates that the Hibernate session was closed before attempting to access the articles association of the User entity, leading to a LazyInitializationException. The Solution To resolve this issue, we can create a custom UserDetails implementation that not only helps manage user authentication more effectively but also ensures that all necessary information is readily available when needed. Step 1: Create CustomUserDetails The first step involves creating a CustomUserDetails class that extends Spring Security's User class. This class should encapsulate all required user properties. [[See Video to Reveal this Text or Code Snippet]] Step 2: Modify JwtAuthenticationFilter Next, you need to update your JwtAuthenticationFilter. This adjustment will involve loading the custom user details instead of the standard user details (which might not encapsulate all necessary data). Here's the updated doFilterInternal method: [[See Video to Reveal this Text or Code Snippet]] Conclusion By implementing a CustomUserDetails class, we defined a way to manage user attributes better and ensured that necessary details are always loaded within an active session. This approach prevents LazyInitializationException by maintaining a consistent state of user data throughout the request lifecycle. In summary, if you are new to Spring Boot and facing issues with LazyInitializationException while dealing with user authentication, follow these steps to effectively manage your user details. Implementing a custom UserDetails class can provide the data you need and help maintain a seamless user experience. Make sure to test your implementation thoroughly. Happy coding!