Found part of my answer.  

 //syntax check the specification
//SwaggerDeserializationResult res = new 
SwaggerParser().readWithInfo(out.toString());  // supports swagger 2
SwaggerParseResult res = new OpenAPIV3Parser().readContents(out.toString(), 
null, null);  //supports openapi3 and requires swagger-parser 2.0
System.out.println(res.getMessages().size() + " Errors");
    for (String msg : res.getMessages()) {

On Friday, March 2, 2018 at 10:40:24 AM UTC-6, Heather Gulledge wrote:
> I'm looking for a way to validate that a swagger/openapi3 interface 
> specification is syntactically correct.  What I am wanting to do is have a 
> pre-commit git hook script that ensures any interface checked into our 
> repository is clean.  Java or python would be preferable.  I know I can do 
> this interactively with swagger ui, but I'm looking for a way to do it as a 
> background process. If it fails I would like to be able to capture the 
> errors to kick back to the submitter.  If it passes I would ideally like to 
> generate the html documentation similar to what swagger ui creates so that 
> can be put in the repository and pushed out to where it is hosted.  
> I see lots of efforts to validate incoming json payloads against a swagger 
> specification, but that is not what I'm looking for here.
> Any suggestions would be appreciated.
> Heather

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