[BUG][JAVA] Unable to generate mailpit openapi spec

[carolosf]

When trying to generate this spec:
https://raw.githubusercontent.com/axllent/mailpit/refs/tags/v1.22.0/server/ui/api/v1/swagger.json

In this project:
https://github.com/carolosf/quarkus-mailpit/blob/openapi_spec_update/testing/pom.xml
Copy swagger.json over https://github.com/carolosf/quarkus-mailpit/blob/openapi_spec_update/testing/src/conf/openapi.json

Run mvn compile in the testing sub project.

OR using the latest snapshot
java -jar ~/Downloads/openapi-generator-cli-8.0.0-20240727.184357-6.jar generate -g java -i https://raw.githubusercontent.com/axllent/mailpit/refs/tags/v1.22.0/server/ui/api/v1/swagger.json -o /var/tmp/java-client-test --skip-validate-spec

[main] INFO  o.o.codegen.DefaultGenerator - Model MessageHeadersResponse not generated since it's an alias to map (without property) and `generateAliasAsModel` is set to false (default)
Exception in thread "main" java.lang.StackOverflowError
	at java.base/java.lang.StringLatin1.replace(StringLatin1.java:453)
	at java.base/java.lang.String.replace(String.java:3142)
	at org.openapitools.codegen.utils.ModelUtils.getSimpleRef(ModelUtils.java:405)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1351)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1397)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1397)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1397)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1397)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1397)
	at org.openapitools.codegen.utils.ModelUtils.unaliasSchema(ModelUtils.java:1397)