NPE thrown in AnnotationUtils due to "API backwards compatibility fix" introduced in 2.2.21 about swagger-core

[frantuma]

Thanks for reporting this. Can you please share the stack trace and ideally a test case reproducing the issue?

[joloto]

Hello,

below is the stack trace.

This error occurred after updating springdoc-openapi from 2.4.0 -> v2.5.0, not directly invoking swagger ourselves. But I will try to create a small sample project that reproduces the error and will respond again here.

[joloto]

here is a small demo spring boot app created with Spring Initializr.
demo.zip

It uses springdoc-openapi 2.5.0 which includes swagger-core 2.2.21.

The test ApiDocsTest fails with the aforementioned NullPointerException
(also demonstrated when manually attempting to load the swagger or api-docs endpoints in the browser when running the application).

Everything works when reverting to swagger-core v2.2.20

The problem appears to be with the processing of response headers.

[frantuma]

fixed in #4650