Scenario for springboot2 -> 3 migration focussing on authentication

[savitharaghunathan]

Create a migration scenario that demonstrates how to upgrade a Spring Boot 2.x application to Spring Boot 3.x, specifically focusing on changes to authentication and security configuration.

Goals:

• Migrate a simple login application from Spring Boot 2.7.x to 3.2.x
• Update security configuration due to deprecation of WebSecurityConfigurerAdapter
• Replace javax.* imports with jakarta.*
• Ensure compatibility with Java 17+

Additional info:

• The old configure(HttpSecurity) approach is no longer valid in Spring Security 6+
• Jakarta EE namespace changes are mandatory

Associated tasks

• Research and identify the scenario
• Create an app with the identified scenario
• Create a migrated version
• Identify custom rules and create them
• run the app with custom rules in kai
• record any changes thats needed, contribute back to custom rules
• Create a scenario doc and share it with QE

[savitharaghunathan]

gh repo - https://github.com/savitharaghunathan/springboot_simplelogin

[savitharaghunathan]

Migrated branch - https://github.com/savitharaghunathan/springboot_simplelogin/tree/springboot3

Custom rules WIP - https://github.com/savitharaghunathan/custom_rules/tree/savitharaghunathan-patch-1/springlogin