{"record":{"id":"b90da8400a426098","repo":"alibaba/spring-ai-alibaba","slug":"copy-method-did-not-return-a-chatoptions-instanc","errorCode":null,"errorMessage":"copy() method did not return a ChatOptions instance","messagePattern":"copy\\(\\) method did not return a ChatOptions instance","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":120,"sourceCode":"\t\t\t// 处理父类方法 - 转发到原始对象\n\t\t\treturn method.invoke(chatOptions, args);\n\t\t}\n\n\t\tprivate boolean isCopyMethod(Method method) {\n\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/**","sourceCodeStart":102,"sourceCodeEnd":138,"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#L102-L138","documentation":"ChatOptionsProxy.createCopiedProxy deep-copies a ChatOptions via reflection by invoking its copy() method and expects the result to be a ChatOptions. If the implementation's copy() returns something else (a subtype wrapper, null, or a differently typed object), the instanceof check fails and an IllegalStateException is thrown, since the proxy cannot build a safe copy to attach observation metadata to.","triggerScenarios":"Creating a ChatOptionsProxy around a ChatOptions implementation whose copy() method returns null or a non-ChatOptions object — typically a custom/legacy ChatOptions class whose copy() signature or return type was changed.","commonSituations":"Upgrading Spring AI so a custom ChatOptions copy() no longer returns ChatOptions; a hand-written ChatOptions where copy() returns a builder or a record of a different type; copy() throwing internally and returning null via a catch block.","solutions":["Fix the ChatOptions implementation so copy() returns a proper ChatOptions (usually 'return new DeepSeekChatOptions(this);' style copy constructor).","Update to the Spring AI version whose ChatOptions API matches what ChatOptionsProxy expects (Spring AI 1.1.x per the BOM).","If copy() cannot be fixed, return the original options instance instead of proxying, or register the options type in ChatOptionsProxy with a dedicated copy strategy."],"exampleFix":"// before\npublic Object copy() { return toBuilder(); } // returns builder, not ChatOptions\n// after\n@Override\npublic MyChatOptions copy() { return new MyChatOptions(this); }","handlingStrategy":"type-guard","validationCode":"Object copied = options.getClass().getMethod(\"copy\").invoke(options);\nif (!(copied instanceof ChatOptions)) { throw new IllegalStateException(\"copy() returns non-ChatOptions\"); }","typeGuard":"static boolean hasValidCopy(ChatOptions o) {\n    try { return o.copy() instanceof ChatOptions; } catch (Exception e) { return false; }\n}","tryCatchPattern":"try { return ChatOptionsProxy.createProxy(options, meta); }\ncatch (IllegalStateException e) {\n    if (e.getMessage().contains(\"did not return a ChatOptions\")) { return callWithoutProxy(options, meta); }\n    throw e;\n}","preventionTips":["Keep custom ChatOptions copy() implementations returning the concrete options type","Pin Spring AI versions via the spring-ai-alibaba-bom","Write a reflection test asserting copy() return types for all ChatOptions classes"],"tags":["reflection","chat-options","type-mismatch","spring-ai"],"backgroundTag":"type-mismatch","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"}