{"record":{"id":"b289e4c157e85d6b","repo":"alibaba/spring-ai-alibaba","slug":"failed-to-invoke-copy-method","errorCode":null,"errorMessage":"Failed to invoke copy() method","messagePattern":"Failed to invoke copy\\(\\) method","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/utils/ChatOptionsProxy.java","lineNumber":128,"sourceCode":"\t\t}\n\n\t\tprivate Object createCopiedProxy() {\n\t\t\tChatOptions copiedChatOptions;\n\t\t\ttry {\n\t\t\t\tMethod copyMethod = chatOptions.getClass().getMethod(\"copy\");\n\t\t\t\t// 如果是 private 或 protected，需要 setAccessible(true)\n\t\t\t\tcopyMethod.setAccessible(true);\n\t\t\t\tObject result = copyMethod.invoke(chatOptions);\n\t\t\t\tif (!(result instanceof ChatOptions)) {\n\t\t\t\t\tthrow new IllegalStateException(\"copy() method did not return a ChatOptions instance\");\n\t\t\t\t}\n\t\t\t\tcopiedChatOptions = (ChatOptions) result;\n\t\t\t}\n\t\t\tcatch (NoSuchMethodException e) {\n\t\t\t\tthrow new IllegalStateException(\"ChatOptions implementation missing copy() method\", e);\n\t\t\t}\n\t\t\tcatch (Exception e) {\n\t\t\t\tthrow new RuntimeException(\"Failed to invoke copy() method\", e);\n\t\t\t}\n\n\t\t\t// 创建新的代理对象（深拷贝 metadata）\n\t\t\treturn ChatOptionsProxy.createProxy(\n\t\t\t\t\tcopiedChatOptions,\n\t\t\t\t\tnew HashMap<>(this.observationMetadata)\n\t\t\t);\n\t\t}\n\n\t\t/**\n\t\t * 处理观察方法 - 基于方法名动态处理\n\t\t */\n\t\tprivate Object handleObservationMethod(String methodName, Object[] args) {\n\t\t\tswitch (methodName) {\n\t\t\tcase \"getObservationMetadata\":\n\t\t\t\treturn observationMetadata;\n\n\t\t\tcase \"setObservationMetadata\":","sourceCodeStart":110,"sourceCodeEnd":146,"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/utils/ChatOptionsProxy.java#L110-L146","documentation":"After finding copy() reflectively, ChatOptionsProxy invokes it. Any failure during invocation — IllegalAccessException, IllegalArgumentException, or an InvocationTargetException wrapping an exception thrown inside the implementation's copy() — is caught and rethrown as RuntimeException('Failed to invoke copy() method', e). This signals the copy itself blew up, not that the method was missing.","triggerScenarios":"call() chain reaches ChatOptionsProxy.intercept -> createCopiedProxy; copyMethod.invoke(chatOptions) throws: the implementation's copy() raised an exception (bad field copy, null inner object), or the method/instance state made invocation illegal.","commonSituations":"A ChatOptions whose copy() dereferences uninitialized fields; proxy/CGLIB-subclassed options where the reflective call hits the wrong instance; exceptions in getters invoked during the copy constructor.","solutions":["Inspect the cause chain (e.getCause()) to find the exception thrown inside the ChatOptions copy() implementation and fix it there.","Ensure the ChatOptions instance passed to the proxy is fully initialized (no nulls copy() cannot handle).","Replace the buggy custom ChatOptions with a standard framework implementation that has a well-tested copy()."],"exampleFix":"// before\npublic MyOptions copy() { return new MyOptions(modelId.length(), ...); } // NPE if modelId null\n// after\npublic MyOptions copy() { return new MyOptions(this.modelId, this.temperature, ...); } // plain field copy","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try { return ChatOptionsProxy.createProxy(options, meta); }\ncatch (RuntimeException e) {\n    if (e.getMessage() != null && e.getMessage().contains(\"Failed to invoke copy()\")) {\n        log.error(\"copy() failed in {}\", options.getClass(), e.getCause()); // inspect the cause\n        throw e;\n    }\n    throw e;\n}","preventionTips":["Make copy() a plain field copy with no side effects or null dereferences","Fully initialize ChatOptions before handing them to the proxy","Always log/print the wrapped cause when debugging"],"tags":["reflection","chat-options","invocation-failure","spring-ai"],"backgroundTag":"internal-invariant-violation","analyzedSha":"f82da0b50f35744c13968191be2b1cd2452ef550","analyzedAt":"2026-09-09T15:32:42.421Z","contentChangedAt":"2026-09-09T15:32:42.421Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}