{"record":{"id":"a91f70eda3256a86","repo":"alibaba/spring-ai-alibaba","slug":"chatoptions-implementation-missing-copy-method","errorCode":null,"errorMessage":"ChatOptions implementation missing copy() method","messagePattern":"ChatOptions implementation missing copy\\(\\) method","errorType":"validation","errorClass":"IllegalStateException","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":125,"sourceCode":"\t\t\treturn \"copy\".equals(method.getName())\n\t\t\t\t\t&& method.getParameterCount() == 0\n\t\t\t\t\t&& ChatOptions.class.isAssignableFrom(method.getReturnType());\n\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\":","sourceCodeStart":107,"sourceCodeEnd":143,"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#L107-L143","documentation":"ChatOptionsProxy locates the copy() method on the ChatOptions implementation via getClass().getMethod(\"copy\") for its deep-copy logic. If the implementation (or any superclass) exposes no public parameterless copy() method, a NoSuchMethodException is wrapped in this IllegalStateException: the proxy cannot proceed without a copyable options object.","triggerScenarios":"Creating a ChatOptionsProxy around a custom ChatOptions class that omits the copy() method required by the Spring AI ChatOptions interface contract, or implements it with a non-public/different-signature variant.","commonSituations":"Hand-rolled ChatOptions implementations that only partially implement the interface; old Spring AI versions where copy() was named differently or absent; classpath mixing of incompatible spring-ai-core versions so the runtime class lacks copy().","solutions":["Implement a public parameterless copy() method on the ChatOptions class returning a new instance of itself.","Align the spring-ai-alibaba and Spring AI versions (use the spring-ai-alibaba-bom) so the interface's default copy()/methods match.","As a workaround, wrap the options in a standard implementation (e.g. the framework's own options class) before proxying."],"exampleFix":"// before\nclass MyOptions implements ChatOptions { /* no copy() */ }\n// after\nclass MyOptions implements ChatOptions {\n    @Override\n    public MyOptions copy() { return new MyOptions(this); }\n}","handlingStrategy":"type-guard","validationCode":"try { options.getClass().getMethod(\"copy\"); } catch (NoSuchMethodException e) { throw new IllegalStateException(\"ChatOptions lacks copy(): \" + options.getClass()); }","typeGuard":"static boolean supportsCopy(Object o) {\n    try { o.getClass().getMethod(\"copy\"); return true; } catch (NoSuchMethodException e) { return false; }\n}","tryCatchPattern":"try { return ChatOptionsProxy.createProxy(options, meta); }\ncatch (IllegalStateException e) {\n    if (e.getMessage().contains(\"missing copy() method\")) { log.error(\"fix ChatOptions impl: {}\", options.getClass().getName()); }\n    throw e;\n}","preventionTips":["Implement the full ChatOptions interface including copy() in custom classes","Avoid mixed spring-ai-core versions on the classpath","Add a startup assertion that proxied option types expose copy()"],"tags":["reflection","chat-options","missing-method","spring-ai"],"backgroundTag":"method-not-implemented","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"}