[BUG] SolonMcp v3.8.0 STREAMABLE_STATELESS模式 和 MCP Inspector v0.18.0有兼容问题，无法连接测试

[EddyPan]

关联版本

您当前正在使用我们框架的哪个版本？
SolonMcp v3.8.0

问题描述

升级到v3.8.0版本，使用STREAMABLE_STATELESS模式，通过MCP Inspector v0.18.0连接失败
后端报错：
ERROR 2025-12-31 10:57:17.995 #75044 [-smarthttp-12] reactor.core.publisher.Operators#console:
Operator called default onErrorDropped
reactor.core.Exceptions$ErrorCallbackNotImplemented: io.modelcontextprotocol.spec.McpError: Missing handler for request type: logging/setLevel
Caused by: io.modelcontextprotocol.spec.McpError: Missing handler for request type: logging/setLevel
at io.modelcontextprotocol.server.DefaultMcpStatelessServerHandler.handleRequest(DefaultMcpStatelessServerHandler.java:35)
at io.modelcontextprotocol.server.transport.WebRxStatelessServerTransport.lambda$doHandlePost$2(WebRxStatelessServerTransport.java:113)
at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:153)
at reactor.core.publisher.MonoFlatMap.subscribeOrReturn(MonoFlatMap.java:53)
at reactor.core.publisher.Flux.subscribe(Flux.java:8876)
at reactor.core.publisher.Flux.subscribeWith(Flux.java:9012)
at reactor.core.publisher.Flux.subscribe(Flux.java:8856)
at reactor.core.publisher.Flux.subscribe(Flux.java:8780)
at reactor.core.publisher.Flux.subscribe(Flux.java:8698)
at org.noear.solon.web.rx.integration.RxHandlerImpl.lambda$handle$4(RxHandlerImpl.java:88)
at org.noear.solon.rx.impl.CompletableImpl.subscribe(CompletableImpl.java:75)
at org.noear.solon.rx.impl.CompletableImpl.lambda$doOnError$0(CompletableImpl.java:98)
at org.noear.solon.rx.impl.CompletableImpl.subscribe(CompletableImpl.java:75)
at org.noear.solon.rx.impl.CompletableImpl.lambda$doOnComplete$2(CompletableImpl.java:164)
at org.noear.solon.rx.impl.CompletableImpl.subscribe(CompletableImpl.java:75)
at org.noear.solon.rx.impl.CompletableImpl.subscribe(CompletableImpl.java:224)
at org.noear.solon.web.rx.integration.RxReturnValueHandler.returnHandle(RxReturnValueHandler.java:80)
at org.noear.solon.core.handle.Context.returnValue(Context.java:1197)
at io.modelcontextprotocol.server.transport.WebRxStatelessServerTransport.handlePost(WebRxStatelessServerTransport.java:91)
at org.noear.solon.core.route.RouterHandler.handleMain(RouterHandler.java:51)
at org.noear.solon.core.route.RouterHandler.handle1(RouterHandler.java:71)
at org.noear.solon.core.route.RouterInterceptorChainImpl.doIntercept(RouterInterceptorChainImpl.java:54)
at org.noear.solon.core.ChainManager.doRouterIntercept(ChainManager.java:261)
at org.noear.solon.core.route.RouterHandler.handle(RouterHandler.java:103)
at org.noear.solon.core.handle.HandlerPipeline.handle(HandlerPipeline.java:53)
at org.noear.solon.core.handle.FilterChainImpl.doFilter(FilterChainImpl.java:51)
at com.cmsr.devops.mcpserver.McpServerAuth.doFilter(McpServerAuth.java:89)
at org.noear.solon.core.handle.FilterChainImpl.doFilter(FilterChainImpl.java:49)
at com.cmsr.devops.config.WebConfig.doFilter(WebConfig.java:29)
at org.noear.solon.core.handle.FilterChainImpl.doFilter(FilterChainImpl.java:49)
at org.noear.solon.logging.integration.MdcClearFilter.doFilter(MdcClearFilter.java:33)
at org.noear.solon.core.handle.FilterChainImpl.doFilter(FilterChainImpl.java:49)
at org.noear.solon.core.ChainManager.doFilter(ChainManager.java:119)
at org.noear.solon.SolonApp.lambda$tryHandle$6(SolonApp.java:624)
at org.noear.solon.util.ScopeLocalJdk8.withOrThrow(ScopeLocalJdk8.java:81)
at org.noear.solon.core.handle.ContextHolder.currentWith(ContextHolder.java:43)
at org.noear.solon.SolonApp.tryHandle(SolonApp.java:619)
at org.noear.solon.server.smarthttp.http.SmHttpContextHandler.handleDo(SmHttpContextHandler.java:123)
at org.noear.solon.server.smarthttp.http.SmHttpContextHandler.handle0(SmHttpContextHandler.java:101)
at org.noear.solon.server.smarthttp.http.SmHttpContextHandler.lambda$handle$0(SmHttpContextHandler.java:86)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)

如何复现

请详细告诉我们如何复现您遇到的问题，并附上可复现的代码示例

1. 基于SolonMcp v3.8.0 开发STREAMABLE_STATELESS类型MCP
2. 使用MCP Inspector v0.18.0 测试MCP功能，提示连接失败，后端报错

//可在此输入示例代码

@McpServerEndpoint(channel = McpChannel.STREAMABLE_STATELESS, name = "xxx-mcp", mcpEndpoint = "/mcp/xxx")

预期结果

请告诉我们您预期会发生什么。
希望STREAMABLE_STATELESS仍然可以使用MCP Inspector进行测试

实际结果

请告诉我们实际发生了什么。
希望STREAMABLE_STATELESS模式使用MCP Inspector连接报错

截图或视频

[noear]

MCP Inspector 是用什么方式链接 mcp-server 的？

---

solon-ai 相关的问题。后面发到 solon-ai 仓库

[EddyPan]

MCP Inspector 是用什么方式链接 mcp-server 的？

使用streamable-http协议连接MCP，截图中可以看到

solon-ai 相关的问题。后面发到 solon-ai 仓库

好的

[noear]

从代码上看，是合理的（以下是 sdk 代码）。。。可能 MCP Inspector 是用来测试完整 STREAMABLE 协议了。。。可以不用管它，日常使用是 ok 的。

这是产生那个异常的代码：

return Mono.error(new McpError("Missing handler for request type: " + request.method()));

STREAMABLE_STATELESS 的话，有些功能不支持。。。//如果 sdk 有新的变化，我们会持续跟进的。

	public DefaultMcpStatelessServerHandler(Map<String, McpStatelessRequestHandler<?>> requestHandlers,
											Map<String, McpStatelessNotificationHandler> notificationHandlers) {
		this.requestHandlers = requestHandlers;
		this.notificationHandlers = notificationHandlers;
	}

	@Override
	public Mono<McpSchema.JSONRPCResponse> handleRequest(McpTransportContext transportContext,
														 McpSchema.JSONRPCRequest request) {
		McpStatelessRequestHandler<?> requestHandler = this.requestHandlers.get(request.method());
		if (requestHandler == null) {
			return Mono.error(new McpError("Missing handler for request type: " + request.method()));
		}
		return requestHandler.handle(transportContext, request.params())
				.map(result -> new McpSchema.JSONRPCResponse(McpSchema.JSONRPC_VERSION, request.id(), result, null))
				.onErrorResume(t -> {
					McpSchema.JSONRPCResponse.JSONRPCError error = null;
					if (t instanceof McpError) {
						McpError mcpError = (McpError) t;
						if (mcpError.getJsonRpcError() != null) {
							error = mcpError.getJsonRpcError();
						}
					}

					if (error == null) {
						error = new McpSchema.JSONRPCResponse.JSONRPCError(McpSchema.ErrorCodes.INTERNAL_ERROR,
								t.getMessage(), null);
					}

					return Mono.just(new McpSchema.JSONRPCResponse(McpSchema.JSONRPC_VERSION, request.id(), null, error));
				});
	}

[noear]

下次有问题，发到 solon-ai 仓库。帮忙加个星：

https://github.com/opensolon/solon-ai

[noear]

"McpSchema.METHOD_xxx" 是提供的方法，确实没有 log 相关。

---

McpStatelessAsyncServer(McpStatelessServerTransport mcpTransport, McpJsonMapper jsonMapper,
							McpStatelessServerFeatures.Async features, Duration requestTimeout,
							McpUriTemplateManagerFactory uriTemplateManagerFactory, JsonSchemaValidator jsonSchemaValidator) {
		this.mcpTransportProvider = mcpTransport;
		this.jsonMapper = jsonMapper;
		this.serverInfo = features.serverInfo();
		this.serverCapabilities = features.serverCapabilities();
		this.instructions = features.instructions();
		this.tools.addAll(withStructuredOutputHandling(jsonSchemaValidator, features.tools()));
		this.resources.putAll(features.resources());
		this.resourceTemplates.putAll(features.resourceTemplates());
		this.prompts.putAll(features.prompts());
		this.completions.putAll(features.completions());
		this.uriTemplateManagerFactory = uriTemplateManagerFactory;
		this.jsonSchemaValidator = jsonSchemaValidator;

		Map<String, McpStatelessRequestHandler<?>> requestHandlers = new HashMap<>();

		// Initialize request handlers for standard MCP methods

		// Ping MUST respond with an empty data, but not NULL response.
		requestHandlers.put(McpSchema.METHOD_PING, (ctx, params) -> Mono.just(new HashMap<>()));

		requestHandlers.put(McpSchema.METHOD_INITIALIZE, asyncInitializeRequestHandler());

		// Add tools API handlers if the tool capability is enabled
		if (this.serverCapabilities.tools() != null) {
			requestHandlers.put(McpSchema.METHOD_TOOLS_LIST, toolsListRequestHandler());
			requestHandlers.put(McpSchema.METHOD_TOOLS_CALL, toolsCallRequestHandler());
		}

		// Add resources API handlers if provided
		if (this.serverCapabilities.resources() != null) {
			requestHandlers.put(McpSchema.METHOD_RESOURCES_LIST, resourcesListRequestHandler());
			requestHandlers.put(McpSchema.METHOD_RESOURCES_READ, resourcesReadRequestHandler());
			requestHandlers.put(McpSchema.METHOD_RESOURCES_TEMPLATES_LIST, resourceTemplateListRequestHandler());
		}

		// Add prompts API handlers if provider exists
		if (this.serverCapabilities.prompts() != null) {
			requestHandlers.put(McpSchema.METHOD_PROMPT_LIST, promptsListRequestHandler());
			requestHandlers.put(McpSchema.METHOD_PROMPT_GET, promptsGetRequestHandler());
		}

		// Add completion API handlers if the completion capability is enabled
		if (this.serverCapabilities.completions() != null) {
			requestHandlers.put(McpSchema.METHOD_COMPLETION_COMPLETE, completionCompleteRequestHandler());
		}

		this.protocolVersions = new ArrayList<>(mcpTransport.protocolVersions());

		McpStatelessServerHandler handler = new DefaultMcpStatelessServerHandler(requestHandlers, new HashMap<>());
		mcpTransport.setMcpHandler(handler);
	}