openapi-generator: [BUG] Error processing OpenAPI json file for python client

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What’s the actual output vs expected output? (just errors out)
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Description

Trying to process the OpenAPI spec from the Owlery system, https://github.com/phenoscape/owlery (spec posted below) with the python and python-experimental systems, I get errors processing the files.

Using the command-line locally I get:

Exception in thread "main" java.lang.RuntimeException: Could not process operation:
  Tag: class Tag {
    name: Knowledgebases
    description: null
    externalDocs: null
}
  Operation: null
  Resource: get /kbs
  Schemas: {}
  Exception: Cannot read field "isEnum" because "cp" is null

Using the docker image I get:

Exception in thread "main" java.lang.RuntimeException: Could not process operation:
  Tag: class Tag {
    name: Knowledgebases
    description: null
    externalDocs: null
}
  Operation: null
  Resource: get /kbs
  Schemas: {}
  Exception: null
	at org.openapitools.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:1163)
	at org.openapitools.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:1054)
	at org.openapitools.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:549)
	at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:891)
	at org.openapitools.codegen.cmd.Generate.execute(Generate.java:441)
	at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
	at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: java.lang.NullPointerException
	at org.openapitools.codegen.languages.PythonClientCodegen.fromProperty(PythonClientCodegen.java:440)
	at org.openapitools.codegen.DefaultCodegen.getContent(DefaultCodegen.java:6755)
	at org.openapitools.codegen.DefaultCodegen.fromOperation(DefaultCodegen.java:4011)
	at org.openapitools.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:1131)
	... 6 more

openapi-generator version

5.4.0

OpenAPI declaration file content or url

YAML is available here: https://gist.github.com/rpgoldman/a65d85f15a9f8b08298cb19446c1b7f0

Generation Details

I believe “steps to reproduce,” below, has all the required information, but happy to collect more if needed.

Steps to reproduce

CLI:

 openapi-generator generate --package-name owlery_client -v --generator-name python --output owlery-client -i swagger.json

Docker:

docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli generate -i /local/swagger.json -g python-experimental -o /local/owlery-client

Related issues/PRs

Suggest a fix

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 16 (6 by maintainers)

Most upvoted comments

Aha! For my sub-issue 2 above, the magical answer is to prepend

_JAVA_OPTIONS="--add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED"

to the invocation of openapi-generator. I can use the python-experimental generator as follows:

_JAVA_OPTIONS="--add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED" openapi-generator generate --package-name owlery_client -vv --generator-name python-experimental --output owlery-client -i swagger.yaml 2>&1 | tee openapi-generator-experimental.out

Then it runs to completion successfully.

+20

rpgoldman on Apr 13, 2022

Just leaving this here, mainly in case it helps someone or might provide a clue.

So, I was using Java 17 with the python generator with the petstore.json and got the java.lang.reflect.InaccessibleObjectException error.

I was able to run other generators, confirmed this by testing with the javascript, java, go generators.

Then I swapped to Java 11 and was able to generate a python SDK when using Java 11, haven’t tried other versions of Java, but perhaps someone might be able to comment on the Java version compatibility…

corrigancd on Mar 1, 2023

Great, thanks. I have worked around that for now by adding schemas everywhere. I was having the error reported above when using python-experimental, but with the _JAVA_ARGS workaround now both of the code generators work for me!

rpgoldman on Apr 13, 2022