OpenAPITools/openapi-generator · error · IllegalArgumentException

packageName must not be blank

Error message

packageName must not be blank

What it means

Error "packageName must not be blank" thrown in OpenAPITools/openapi-generator.

Source

Thrown at modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CppBoostBeastClientCodegen.java:192

            return name;
        }

        name = toVarName(name);

        if (name.startsWith("_")) {
            return "_" + camelize(name);
        }

        return camelize(name);
    }

    @Override
    public void processOpts() {
        super.processOpts();
        packageName = additionalProperties.getOrDefault(
                CodegenConstants.PACKAGE_NAME, DEFAULT_PACKAGE_NAME).toString();
        if (StringUtils.isBlank(packageName)) {
            throw new IllegalArgumentException("packageName must not be blank");
        }
        additionalProperties.put(CodegenConstants.PACKAGE_NAME, packageName);
        additionalProperties.put("modelNamespaceDeclarations", modelPackage.split("\\."));
        additionalProperties.put("modelNamespace", modelPackage.replaceAll("\\.", "::"));
        additionalProperties.put("apiNamespaceDeclarations", apiPackage.split("\\."));
        additionalProperties.put("apiNamespace", apiPackage.replaceAll("\\.", "::"));
    }

    /**
     * Location to write model files. You can use the modelPackage() as defined
     * when the class is instantiated
     */
    @Override
    public String modelFileFolder() {
        return (outputFolder + "/model").replace("/", File.separator);
    }

    /**

View on GitHub (pinned to fcec517be3)

Solutions

1. Set a non-blank packageName via '--additional-properties packageName=com.example'.

When it happens

Trigger: Thrown when the 'packageName' option for the C++ Boost.Beast client generator is empty or blank. Set a non-empty packageName.

Common situations: See trigger scenarios.

AI-assisted analysis of OpenAPITools/openapi-generator@fcec517be3 (2026-08-22). Data as JSON: /api/errors/0869e41777a30ac1. Report an issue: GitHub.