OpenAPITools/openapi-generator · error · RuntimeException

Empty method/operation name (operationId) not allowed

Error message

Empty method/operation name (operationId) not allowed

What it means

Error "Empty method/operation name (operationId) not allowed" thrown in OpenAPITools/openapi-generator.

Source

Thrown at modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ClojureClientCodegen.java:329

    public String sanitizeTag(String tag) {
        return tag.replaceAll("[^a-zA-Z_]+", "_");
    }

    @Override
    public String apiFileFolder() {
        return outputFolder + File.separator + sourceFolder + File.separator + namespaceToFolder(apiPackage);
    }

    @Override
    public String modelFileFolder() {
        return outputFolder + File.separator + sourceFolder + File.separator + namespaceToFolder(modelPackage);
    }

    @Override
    public String toOperationId(String operationId) {
        // throw exception if method name is empty
        if (StringUtils.isEmpty(operationId)) {
            throw new RuntimeException("Empty method/operation name (operationId) not allowed");
        }

        return dashize(sanitizeName(operationId));
    }

    @Override
    public String toApiFilename(String name) {
        return underscore(toApiName(name));
    }

    @Override
    public String toModelFilename(String name) {
        return underscore(toModelName(name));
    }

    @Override
    public String toApiName(String name) {
        return dashize(name);

View on GitHub (pinned to fcec517be3)

Solutions

1. Provide a non-empty operationId for every operation in the OpenAPI spec.

When it happens

Trigger: Thrown when an operation in the OpenAPI spec has an empty or missing operationId while generating a Clojure client. Provide a non-empty operationId for every operation.

Common situations: See trigger scenarios.

AI-assisted analysis of OpenAPITools/openapi-generator@fcec517be3 (2026-08-22). Data as JSON: /api/errors/dbf5101f844d0268. Report an issue: GitHub.