{"record":{"id":"78b478903df7a8d6","repo":"alibaba/spring-ai-alibaba","slug":"failed-to-resolve-nacos-reference-cause-message","errorCode":null,"errorMessage":"Failed to resolve Nacos reference: <cause message>","messagePattern":"Failed to resolve Nacos reference: <cause message>","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"spring-boot-starters/spring-ai-alibaba-starter-config-nacos/src/main/java/com/alibaba/cloud/ai/agent/nacos/tools/NacosMcpGatewayToolCallback.java","lineNumber":177,"sourceCode":"\t\t\tif (!org.springframework.util.StringUtils.hasText(configContent)) {\n\t\t\t\tlogger.warn(\"[resolveNacosReference] No content found for dataId: {}, group: {}\", dataId, group);\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\t// 如果没有点语法，直接返回配置内容\n\t\t\tif (!org.springframework.util.StringUtils.hasText(dotNotation)) {\n\t\t\t\treturn configContent;\n\t\t\t}\n\n\t\t\t// 如果有点语法，去掉开头的点号，然后解析JSON并提取指定字段\n\t\t\tString jsonPath = dotNotation.startsWith(\".\") ? dotNotation.substring(1) : dotNotation;\n\t\t\treturn extractJsonValueFromNacos(configContent, jsonPath);\n\n\t\t}\n\t\tcatch (Exception e) {\n\t\t\t// 记录日志但不中断处理\n\t\t\tlogger.error(\"[resolveNacosReference] Failed to resolve Nacos reference: {}\", e.getMessage(), e);\n\t\t\tthrow new RuntimeException(\"Failed to resolve Nacos reference: \" + e.getMessage(), e);\n\t\t}\n\t}\n\n\t/**\n\t * 获取Nacos配置内容\n\t * @param dataId 配置ID\n\t * @param group 分组\n\t * @return 配置内容\n\t * @throws NacosException Nacos异常\n\t */\n\tprivate String getConfigContent(String dataId, String group) throws NacosException {\n\t\tString cacheKey = dataId + \"@@\" + group;\n\t\tif (nacosConfigContent.containsKey(cacheKey)) {\n\t\t\treturn nacosConfigContent.get(cacheKey);\n\t\t}\n\t\telse {\n\t\t\tAbstractListener listener = new AbstractListener() {\n\t\t\t\t@Override","sourceCodeStart":159,"sourceCodeEnd":195,"githubUrl":"https://github.com/alibaba/spring-ai-alibaba/blob/f82da0b50f35744c13968191be2b1cd2452ef550/spring-boot-starters/spring-ai-alibaba-starter-config-nacos/src/main/java/com/alibaba/cloud/ai/agent/nacos/tools/NacosMcpGatewayToolCallback.java#L159-L195","documentation":"Generic wrapper thrown by NacosMcpGatewayToolCallback.resolveNacosReference when any step of resolving a Nacos reference (parsing the reference, fetching config content, extracting a JSON path value) throws. The message carries the underlying cause message and the cause is preserved; the log line '[resolveNacosReference] Failed to resolve Nacos reference' is emitted first.","triggerScenarios":"Any Exception from resolveNacosReference internals — invalid reference format (965), Nacos client failing to fetch the dataId/group (config absent, Nacos unreachable), or JSON-path extraction errors — propagates through this wrapper.","commonSituations":"Nacos server unreachable or wrong server address configured; dataId/group does not exist; auth (username/password) missing for the Nacos namespace; referenced config is not valid JSON.","solutions":["Inspect the wrapped cause message in this exception to identify the actual failure (format, network, or JSON).","Verify the Nacos server address, namespace, and credentials in the application configuration.","Confirm the dataId/group exists in the target Nacos namespace and the content is valid JSON.","Test Nacos connectivity from the deployment environment (network/firewall/DNS)."],"exampleFix":"// before: placeholder never resolves because config is missing\nString ref = \"nonexistent-config/DEFAULT_GROUP\";\n// after: create the dataId in the namespace or fix the reference\nString ref = \"user-service-config/DEFAULT_GROUP\"; // published in the configured namespace","handlingStrategy":"try-catch","validationCode":"// Pre-flight: check Nacos connectivity and config existence via the Nacos client\nConfigService cs = NacosFactory.createConfigService(serverAddr);\nString content = cs.getConfig(dataId, group, 3000);\nif (content == null) throw new IllegalStateException(\"Config missing: \" + dataId + \"/\" + group);","typeGuard":null,"tryCatchPattern":"try {\n    return callback.call(input);\n} catch (RuntimeException e) {\n    if (e.getMessage().startsWith(\"Failed to resolve Nacos reference\")) {\n        logger.error(\"Nacos resolution failed; cause: {}\", e.getCause());\n        // fallback to default value or rethrow after diagnostics\n    }\n    throw e;\n}","preventionTips":["Pre-fetch the referenced config at startup to validate server address, namespace, and credentials.","Log e.getCause() — the wrapper message only repeats the cause message.","Monitor Nacos availability from the deployment environment."],"tags":["nacos","config","resolution","wrapper"],"backgroundTag":"config-file-not-found","analyzedSha":"f82da0b50f35744c13968191be2b1cd2452ef550","analyzedAt":"2026-09-09T15:32:42.421Z","contentChangedAt":"2026-09-09T15:32:42.421Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}