alibaba/nacos · error · IllegalArgumentException

Ambiguous plugin config key '{}' matches multiple items: {}

Error message

Ambiguous plugin config key '{}' matches multiple items: {}

What it means

Error "Ambiguous plugin config key '{}' matches multiple items: {}" thrown in alibaba/nacos.

Source

Thrown at core/src/main/java/com/alibaba/nacos/core/plugin/config/PluginConfigKeyResolver.java:222

        
        ConfigKeyMapping(String itemKey, ConfigKeyPriority priority) {
            itemKeys.add(itemKey);
            this.priority = priority;
        }
        
        void merge(String itemKey, ConfigKeyPriority newPriority) {
            if (newPriority.isHigherThan(priority)) {
                itemKeys.clear();
                itemKeys.add(itemKey);
                priority = newPriority;
            } else if (newPriority == priority) {
                itemKeys.add(itemKey);
            }
        }
        
        String getItemKey(String inputKey) {
            if (itemKeys.size() > 1) {
                throw new IllegalArgumentException("Ambiguous plugin config key '" + inputKey
                    + "' matches multiple items: " + itemKeys);
            }
            return itemKeys.iterator().next();
        }
        
        ConfigKeyPriority getPriority() {
            return priority;
        }
        
    }
    
    private static class ResolvedConfigValue {
        
        private final String value;
        
        private final ConfigKeyPriority priority;
        
        private final String sourceKey;

View on GitHub (pinned to 9b989acdf1)

Solutions

1. Review the input and runtime state for ambiguous 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/PluginConfigKeyResolver.java:222 when the library encounters an invalid state.

Common situations: A plugin config key prefix matched multiple configuration items.

AI-assisted analysis of alibaba/nacos@9b989acdf1 (2026-08-14). Data as JSON: /api/errors/7712831279fea995. Report an issue: GitHub.