Spring Code Generation issue in 3.0.9 with OpenAPI 3.0 Version

[shameerkc]

Description

When I execute the code generation using version 3.0.8 is works just fine.

java -jar swagger-codegen-cli-3.0.8.jar generate -i TS29571_CommonData.yaml -l spring -o GENERATED_COMMON_08

However, when the same command is tried with latest version, it does not work.

java -jar swagger-codegen-cli-3.0.9.jar generate -i TS29571_CommonData.yaml -l spring -o GENERATED_COMMON_09

Corresponding logs can be seen below:

`
14:51:15.423 [Thread-1] WARN io.swagger.codegen.v3.generators.java.AbstractJavaCodegen - Double (reserved word) cannot be used as model name. Renamed to ModelDouble
Exception in thread "Thread-1" java.lang.RuntimeException: Could not process model 'PatchOperation'.Please make sure that your schema is correct!
at io.swagger.codegen.v3.DefaultGenerator.generateModels(DefaultGenerator.java:378)
at io.swagger.codegen.v3.DefaultGenerator.generate(DefaultGenerator.java:756)
at io.swagger.codegen.v3.cli.cmd.Generate.run(Generate.java:342)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at io.swagger.codegen.v3.generators.util.OpenAPIUtil.getSimpleRef(OpenAPIUtil.java:32)
at io.swagger.codegen.v3.generators.SchemaHandler.configureAnyOfModel(SchemaHandler.java:75)
at io.swagger.codegen.v3.generators.DefaultCodegenConfig.fromModel(DefaultCodegenConfig.java:1374)
at io.swagger.codegen.v3.generators.java.AbstractJavaCodegen.fromModel(AbstractJavaCodegen.java:895)
at io.swagger.codegen.v3.DefaultGenerator.processModels(DefaultGenerator.java:988)
at io.swagger.codegen.v3.DefaultGenerator.generateModels(DefaultGenerator.java:349)

`

Corresponding API Element

PatchOperation:
   anyOf:
     - type: string
       enum:
         - add
         - copy
         - move
         - remove
         - replace
         - test
     - type: string

Swagger-codegen version

3.0.9

Swagger declaration file content or url

https://github.com/jdegre/5GC_APIs

Common Data is giving the exception - Matching - Common Data

    PatchOperation:
      anyOf:
        - type: string
          enum:
            - add
            - copy
            - move
            - remove
            - replace
            - test
        - type: string

Command line used for generation

Below command works fine:

java -jar swagger-codegen-cli-3.0.8.jar generate -i TS29571_CommonData.yaml -l spring -o GENERATED_COMMON_08

Below line when tried with 3.0.9 breaks it:

java -jar swagger-codegen-cli-3.0.9.jar generate -i TS29571_CommonData.yaml -l spring -o GENERATED_COMMON_09
`

14:51:15.423 [Thread-1] WARN io.swagger.codegen.v3.generators.java.AbstractJavaCodegen - Double (reserved word) cannot be used as model name. Renamed to ModelDouble
Exception in thread "Thread-1" java.lang.RuntimeException: Could not process model 'PatchOperation'.Please make sure that your schema is correct!
at io.swagger.codegen.v3.DefaultGenerator.generateModels(DefaultGenerator.java:378)
at io.swagger.codegen.v3.DefaultGenerator.generate(DefaultGenerator.java:756)
at io.swagger.codegen.v3.cli.cmd.Generate.run(Generate.java:342)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at io.swagger.codegen.v3.generators.util.OpenAPIUtil.getSimpleRef(OpenAPIUtil.java:32)
at io.swagger.codegen.v3.generators.SchemaHandler.configureAnyOfModel(SchemaHandler.java:75)
at io.swagger.codegen.v3.generators.DefaultCodegenConfig.fromModel(DefaultCodegenConfig.java:1374)
at io.swagger.codegen.v3.generators.java.AbstractJavaCodegen.fromModel(AbstractJavaCodegen.java:895)
at io.swagger.codegen.v3.DefaultGenerator.processModels(DefaultGenerator.java:988)
at io.swagger.codegen.v3.DefaultGenerator.generateModels(DefaultGenerator.java:349)
`

Steps to reproduce

The corresponding JAR's hwere downloaded from Maven Central https://repo1.maven.org/maven2/io/swagger/codegen/v3/swagger-codegen-cli/

Related issues/PRs

None

Suggest a fix/enhancement

It looks specific to handling of the anyOf allOf kind of tags.

[frantuma]

fixed in swagger-api/swagger-codegen-generators#415