LCM: Spring Boot 3

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Spring Boot 2.7 Support Ends in November: https://spring.io/projects/spring-boot#support

We should upgrade all services to the newest SB Version (Currently 3.1)

Preparations

• Upgrade to Spring Boot 2.7.x
• Upgrade Spring Security to 5.8 in digiwf-spring-security and use digiwf-spring-security lib in each application (Migrate digiwf-spring-security to Spring Security 5.8 #758)
• Migrate Autoconfigurations (Lifecycle spring boot autoconfigurations #634)
• Remove deprecated libs
  • Remove digiwf-spring-cloudstream-utils (Remove digiwf-spring-cloudstream-utils #757)
  • Remove digiwf-asyncapi-docs (Remove digiwf-asyncapidocs from digiwf #647)
• Use aggregation for digiwf-integrations (Use aggregation for digiwf-integrations #760)

Migration

• Use Aggregation to split parent module into multiple modules to migrate each part of the application separately (Split maven parent in multiple modules to simplify SB3 migration #759)

For each module (#767, #762, #761, #763, #764, #765, #766, #768):

• Upgrade Spring Boot to v3.x
• Upgrade Spring Security
• Configure Properties
• Upgrade dependencies for each application

Finish migration (#770)

Ref Arch refactoring (#769)

In addition to that we should remove/add some RefArch Legacy:

• GracefullShutdown -> SB Probes with proper Openshift Config - RefArch MR
• ErrorMapping to 4xx - RefArch MR
• Maybe more: https://git.muenchen.de/groups/ccse/refarch-archetype/-/merge_requests?scope=all&state=merged

Additional Info

• Spring Boot Migration Guide
• [RefArch Migration Guide: https://git.muenchen.de/ccse/refarch-archetype/refarch-archetype-apigateway/-/wikis/Migrationsguide-Spring-Boot-3-&-Java-17

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