After clone codgen go to codegen folder and run
mvn clean package
java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i <path to swagger file> -l mercurius-go-server -o <generated code output folder>
swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.
HTMLNOASSERTION
After clone codgen go to codegen folder and run
mvn clean package
java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i <path to swagger file> -l mercurius-go-server -o <generated code output folder>