java.lang.NullPointerException

Description

Getting Exception in thread "main" java.lang.NullPointerException
at io.swagger.codegen.DefaultGenerator.generateParameterId(DefaultGenerator.java:832)
at io.swagger.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:756)
at io.swagger.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:725)
at io.swagger.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:354)
at io.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:664)
at io.swagger.codegen.cmd.Generate.run(Generate.java:234)
at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:41)
when generating client python code from Master

Swagger-codegen version

Master

Swagger declaration file content or url

the spec is very long, I'll try to see if I can reduce its size, I suspect the ref "$ref": "#/paths/1api1v2~1services/post/responses/200/schema" in the response body
causes it.

Command line used for generation

java -jar ./modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i ../swagger-combine/swagger.json -l python -o ../swagger-combine/test/

Steps to reproduce

just ran the above command.

Related issues

could not find any.

Suggest a Fix

Looks like https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java#L754 checks if path.getParameters() is not null but not if it does not contain null entries.

Start in modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java around generateParameterId and the path-parameter handling near line 754. Reproduce with the provided swagger-codegen-cli command and a reduced Swagger specification focused on the referenced response schema; done means Python client generation completes without the NullPointerException.