[BUG] C# GenerericHost - Exception

[marcselman]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?

Description

When trying to generate C# output using the GenericHost library I get an exception.
java.lang.IllegalArgumentException: Comparison method violates its general contract!
If I remove some property from the component schema or if I remove some required properties, the error goes away.
It looks like the specific combination of properties in the file somehow cause the error.

This is the whole error:

Exception in thread "main" java.lang.RuntimeException: Could not process model 'MixLog'.Please make sure that your schema is correct!
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:542)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:1228)
        at org.openapitools.codegen.cmd.Generate.execute(Generate.java:535)
        at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: java.lang.IllegalArgumentException: Comparison method violates its general contract!
        at java.base/java.util.TimSort.mergeLo(TimSort.java:781)
        at java.base/java.util.TimSort.mergeAt(TimSort.java:518)
        at java.base/java.util.TimSort.mergeCollapse(TimSort.java:448)
        at java.base/java.util.TimSort.sort(TimSort.java:245)
        at java.base/java.util.Arrays.sort(Arrays.java:1308)
        at java.base/java.util.ArrayList.sort(ArrayList.java:1804)
        at java.base/java.util.Collections.sort(Collections.java:178)
        at org.openapitools.codegen.languages.CSharpClientCodegen.fromModel(CSharpClientCodegen.java:469)
        at org.openapitools.codegen.DefaultGenerator.processModels(DefaultGenerator.java:1683)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:537)
        ... 4 more

openapi-generator version

7.5.0

OpenAPI declaration file content or url

https://gist.github.com/marcselman/78b1516e5a15c92da70a31c851c11c6c

Generation Details

openapi-generator-cli generate -g csharp -o "./client" --package-name "Demonstration" -i "openapi.2023.11.0.json" --additional-properties "library=generichost,nullableReferenceTypes=true,netCoreProjectFile=true,disallowAdditionalPropertiesIfNotPresent=false,targetFramework=net8.0,generateAliasAsModel=false,useDateTimeOffset=true,validatable=true,equatable=false,modelPropertyNaming=PascalCase,useCollection=false,returnICollection=false"

[wing328]

thanks for reporting the issue

cc @devhl-labs

[devhl-labs]

@marcselman The fix for this issue was just moved behind an option. To use the fix now, please add an additional property modelPropertySorting with value either alphabetical or default. The default value for this property is currently legacy (old broken way), but it will be changed in version 8.0.