alibaba/nacos · error · IllegalArgumentException

Invalid label

Error message

Invalid label: {label}

What it means

Error "Invalid label: {label}" thrown in alibaba/nacos.

Solutions

1. Correct the invalid value for label validation to match the expected format or allowed set, then retry.

When it happens

Trigger: Thrown at api/src/main/java/com/alibaba/nacos/api/ai/utils/AgentValidationUtils.java:162 when the library encounters an invalid state.

Common situations: Binding or updating a version label that fails the label syntax rules.

AI-assisted analysis of alibaba/nacos@9b989acdf1 (2026-08-14). Data as JSON: /api/errors/9d2b8a92573e6025. Report an issue: GitHub.

Appendix: source

Thrown at api/src/main/java/com/alibaba/nacos/api/ai/utils/AgentValidationUtils.java:162

     */
    public static void validateProtocolVersion(String protocolVersion) {
        if (protocolVersion == null || protocolVersion.isEmpty()
            || protocolVersion.length() > MAX_PROTOCOL_VERSION_LENGTH) {
            throw new IllegalArgumentException("Invalid protocolVersion: " + protocolVersion);
        }
        validatePrintableAscii(protocolVersion, "protocolVersion");
    }
    
    /**
     * Validate a version label, including the server-managed {@code latest} label.
     *
     * @param label version label
     * @throws IllegalArgumentException when invalid
     */
    public static void validateLabel(String label) {
        if (label == null || label.length() > MAX_LABEL_LENGTH
            || !LABEL_PATTERN.matcher(label).matches()) {
            throw new IllegalArgumentException("Invalid label: " + label);
        }
    }
    
    /**
     * Validate a client-writable version label.
     *
     * @param label version label
     * @throws IllegalArgumentException when invalid or reserved
     */
    public static void validateNonLatestLabel(String label) {
        validateLabel(label);
        if ("latest".equals(label)) {
            throw new IllegalArgumentException("The latest label is server-managed");
        }
    }
    
    /**
     * Validate a transport token without changing its case.

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