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I just noticed there are several java classes with the same hard-coded class name. If it's okay I will go ahead and clean them up as a part of this PR.

can you show us the difference between the two approaches? btw those code are machine generated, you need to edit on the code-template then re-gen.

No difference actually, just more from the java coding standard point of view. Also, since it's auto-generated this need not be corrected. So feel free to close this PR

This is generated code (and we're about to switch the generator) if you want to fix this, it should be done in the openapi code generator project https://github.com/OpenAPITools/openapi-generator/tree/master/modules/openapi-generator/src/main/resources/Java.

I'm going to close this, since we shouldn't modify generated code in this project.