Is there a production-ready Java/Spring Boot MCP server template with OAuth 2.0 + PKCE?

I've built a remote MCP server in production (Spring Boot + OAuth 2.0 + PKCE + RFC 8414 discovery + tool access control) and I'm thinking of open sourcing it as a starter template.
Everything I've found is either Node.js, Python, or only covers the basic stdio transport with no auth. Is this something Java devs are actually struggling with? Would a Spring Boot starter with auth baked in be useful to you?

Open to feedback and suggestions.