Knife4j文档请求异常 空指针
打开swagger文档报空指针异常
java.lang.NullPointerException: null
at springfox.documentation.oas.mappers.SchemaMapper.model(SchemaMapper.java:97)
at springfox.documentation.oas.mappers.SchemaMapper.mapModel(SchemaMapper.java:85)
at springfox.documentation.oas.mappers.ServiceModelToOpenApiMapperImpl.fromRepresentation(ServiceModelToOpenApiMapperImpl.java:187)
at springfox.documentation.oas.mappers.ServiceModelToOpenApiMapper.map(ServiceModelToOpenApiMapper.java:216)
at springfox.documentation.oas.mappers.ServiceModelToOpenApiMapperImpl.mapOperation(ServiceModelToOpenApiMapperImpl.java:113)
at springfox.documentation.oas.mappers.ServiceModelToOpenApiMapper.mapOperations(ServiceModelToOpenApiMapper.java:283)
at springfox.documentation.oas.mappers.ServiceModelToOpenApiMapper.lambda$mapPaths$4(ServiceModelToOpenApiMapper.java:264)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270)使用排除法，定位到是某个新加的controller方法引起的，逐渐尝试，发现是方法的返回值为void引起的，只要返回值不是void，就能正常打开，服了，还是准备换spring doc吧（哭笑）
问了ai，大概是这个原因：
-
Springfox Bug：某些版本（尤其是
3.0.0）的springfox-oas模块在解析Void类型时仍然会触发NullPointerException，因为内部SchemaMapper没有正确处理Void类型的模型映射。 -
OAS 3.0 兼容性问题：Springfox 对 OpenAPI 3.0 的支持不够完善，
void/Void方法在某些情况下无法正确生成 Schema。