The method or(() -> {}) is undefined for the type Optional<OpenAPI>

[taufiquealam007]

Hi,

Could you please help how to compile this project. As i have gone through your instrictions, but it seems this method is not available in Optional class.

I am using jdk 1.8-144 and IDE is eclipse.

changed the copiler to 1.8.144.

OpenApiRoutePublisher.java

Optional spec = Optional.ofNullable(generatedSpecs.get(path)).or(() -> {
OpenAPI openAPI = OpenApiSpecGenerator.generateOpenApiSpecFromRouter(router, title, version, serverUrl);
generatedSpecs.put(path, openAPI);
return Optional.of(openAPI);
});

HeadHandler.java

uploadManager.findUploadInfo(uploadID).or(() -> {
response.setStatusCode(404);
return Optional.empty();
}).ifPresent(info -> {