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I'm looking for suggestions for modern open-source Java applications and libraries for a code analysis project

You can analyse the project I'm working on, but it's not a small project: github.com/kestra-io/ke...

I'm not looking for small projects, so kestra is good

Would be happy to discuss any question you would have ;)

The two most widely-adopted CNCF projects that are implemented in Java are OpenTelemetry's Java libs & Keycloak. OTel is a complex codebase & makes use of advanced classloading / codeweaving tricks - caveat lector. Keycloak should be a good option though.