alibaba/spring-ai-alibaba · error · RuntimeException

Failed to invoke copy() method

Error message

Failed to invoke copy() method

What it means

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.

Source

Thrown at spring-boot-starters/spring-ai-alibaba-starter-config-nacos/src/main/java/com/alibaba/cloud/ai/agent/nacos/utils/ChatOptionsProxy.java:128

		}

		private Object createCopiedProxy() {
			ChatOptions copiedChatOptions;
			try {
				Method copyMethod = chatOptions.getClass().getMethod("copy");
				// 如果是 private 或 protected，需要 setAccessible(true)
				copyMethod.setAccessible(true);
				Object result = copyMethod.invoke(chatOptions);
				if (!(result instanceof ChatOptions)) {
					throw new IllegalStateException("copy() method did not return a ChatOptions instance");
				}
				copiedChatOptions = (ChatOptions) result;
			}
			catch (NoSuchMethodException e) {
				throw new IllegalStateException("ChatOptions implementation missing copy() method", e);
			}
			catch (Exception e) {
				throw new RuntimeException("Failed to invoke copy() method", e);
			}

			// 创建新的代理对象（深拷贝 metadata）
			return ChatOptionsProxy.createProxy(
					copiedChatOptions,
					new HashMap<>(this.observationMetadata)
			);
		}

		/**
		 * 处理观察方法 - 基于方法名动态处理
		 */
		private Object handleObservationMethod(String methodName, Object[] args) {
			switch (methodName) {
			case "getObservationMetadata":
				return observationMetadata;

			case "setObservationMetadata":

View on GitHub (pinned to f82da0b50f)

Solutions

1. Inspect the cause chain (e.getCause()) to find the exception thrown inside the ChatOptions copy() implementation and fix it there.
2. Ensure the ChatOptions instance passed to the proxy is fully initialized (no nulls copy() cannot handle).
3. Replace the buggy custom ChatOptions with a standard framework implementation that has a well-tested copy().

Example fix

// before
public MyOptions copy() { return new MyOptions(modelId.length(), ...); } // NPE if modelId null
// after
public MyOptions copy() { return new MyOptions(this.modelId, this.temperature, ...); } // plain field copy

try { return ChatOptionsProxy.createProxy(options, meta); }
catch (RuntimeException e) {
    if (e.getMessage() != null && e.getMessage().contains("Failed to invoke copy()")) {
        log.error("copy() failed in {}", options.getClass(), e.getCause()); // inspect the cause
        throw e;
    }
    throw e;
}

When it happens

Trigger: 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.

Common situations: 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.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

• copy() method did not return a ChatOptions instance
• ChatOptions implementation missing copy() method
• Tool message not supported
• ChatClient error
• Could not find executeAgent method in AgentToolExecutor clas

AI-assisted analysis of alibaba/spring-ai-alibaba@f82da0b50f (2026-09-09). Data as JSON: /api/errors/b289e4c157e85d6b. Report an issue: GitHub.