alibaba/nacos · error · IllegalArgumentException

Unknown plugin config key: {}

Error message

Unknown plugin config key: {}

What it means

Error "Unknown plugin config key: {}" thrown in alibaba/nacos.

Source

Thrown at core/src/main/java/com/alibaba/nacos/core/plugin/config/PluginConfigBasicChecker.java:101

        }
    }
    
    private Map<String, ConfigItemDefinition> indexDefinitions(
        List<ConfigItemDefinition> definitions) {
        Map<String, ConfigItemDefinition> result = new LinkedHashMap<>();
        for (ConfigItemDefinition definition : definitions) {
            if (StringUtils.isNotBlank(definition.getKey())) {
                result.put(definition.getKey(), definition);
            }
        }
        return result;
    }
    
    private void validateDefinedKeys(Map<String, String> config,
        Map<String, ConfigItemDefinition> definitions) {
        for (Map.Entry<String, String> entry : config.entrySet()) {
            if (!definitions.containsKey(entry.getKey())) {
                throw new IllegalArgumentException(
                    "Unknown plugin config key: " + entry.getKey());
            }
            if (entry.getValue() == null) {
                throw new IllegalArgumentException(
                    "Plugin config value cannot be null: " + entry.getKey());
            }
        }
    }
    
    private void validateRuntimeChangedKeys(Map<String, String> currentConfig,
        Map<String, String> newConfig, Map<String, ConfigItemDefinition> definitions) {
        Map<String, String> current = currentConfig == null ? Collections.emptyMap()
            : currentConfig;
        Set<String> changedKeys = new LinkedHashSet<>(current.keySet());
        changedKeys.addAll(newConfig.keySet());
        for (String key : changedKeys) {
            if (Objects.equals(current.get(key), newConfig.get(key))
                && current.containsKey(key) == newConfig.containsKey(key)) {

View on GitHub (pinned to 9b989acdf1)

Solutions

1. Review the input and runtime state for unknown plugin config key, correct the reported problem, and retry.

When it happens

Trigger: Thrown at core/src/main/java/com/alibaba/nacos/core/plugin/config/PluginConfigBasicChecker.java:101 when the library encounters an invalid state.

Common situations: A plugin configuration update used an unknown key.

AI-assisted analysis of alibaba/nacos@9b989acdf1 (2026-08-14). Data as JSON: /api/errors/d6d8afd0dec1374c. Report an issue: GitHub.