Test swagger-core issue: Schema annotation processing isn’t working with nullable and "null" example
Tested with JDK 17 and GlassFish 6.2.5
You can get the generated OpenAPI document from http://localhost:8080/swagger-nullable-test-1.0-SNAPSHOT/api/openapi.json