Dubbo MCP Integration

[RainYuY]

What is the purpose of the change?

Ref: #15332

Checklist

• [x] Make sure there is a GitHub_issue field for the change.
• [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• [x] Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• [x] Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

:x: Patch coverage is 36.83867% with 967 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 60.77%. Comparing base (dea0206) to head (6076567).

Files with missing lines	Patch %	Lines
...transport/DubboMcpStreamableTransportProvider.java	28.53%	228 Missing and 20 partials :warning:
...va/org/apache/dubbo/mcp/core/McpServiceFilter.java	12.00%	153 Missing and 1 partial :warning:
...ache/dubbo/mcp/tool/DubboOpenApiToolConverter.java	30.09%	120 Missing and 24 partials :warning:
...e/dubbo/mcp/core/McpApplicationDeployListener.java	12.28%	97 Missing and 3 partials :warning:
...pache/dubbo/mcp/tool/DubboServiceToolRegistry.java	57.61%	71 Missing and 18 partials :warning:
...ava/org/apache/dubbo/mcp/util/TypeSchemaUtils.java	51.38%	77 Missing and 11 partials :warning:
...bo/mcp/transport/DubboMcpSseTransportProvider.java	61.72%	30 Missing and 1 partial :warning:
...pache/dubbo/mcp/core/McpServiceExportListener.java	48.14%	25 Missing and 3 partials :warning:
...g/apache/dubbo/mcp/tool/DubboMcpGenericCaller.java	47.16%	25 Missing and 3 partials :warning:
...java/org/apache/dubbo/config/nested/McpConfig.java	0.00%	23 Missing :warning:
... and 5 more

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15406      +/-   ##
============================================
- Coverage     61.06%   60.77%   -0.30%     
- Complexity    11700    11729      +29     
============================================
  Files          1924     1938      +14     
  Lines         87086    88617    +1531     
  Branches      13115    13378     +263     
============================================
+ Hits          53182    53858     +676     
- Misses        28460    29239     +779     
- Partials       5444     5520      +76     

Flag	Coverage Δ
integration-tests-java21	32.46% <1.37%> (-0.40%)	:arrow_down:
integration-tests-java8	32.53% <0.39%> (-0.43%)	:arrow_down:
samples-tests-java21	32.05% <1.17%> (-0.53%)	:arrow_down:
samples-tests-java8	29.85% <0.19%> (-0.49%)	:arrow_down:
unit-tests-java11	59.01% <17.64%> (-0.03%)	:arrow_down:
unit-tests-java17	58.51% <36.51%> (-0.27%)	:arrow_down:
unit-tests-java21	58.50% <36.51%> (-0.29%)	:arrow_down:
unit-tests-java8	59.03% <17.64%> (+<0.01%)	:arrow_up:

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[RainYuY]

PTAL @AlbumenJ @CrazyHZM

[RainYuY]

There are many Chinese comments in the change commit.

Done.Translation completed.

[SpursJiang]

Dear Dubbo team: Once a Dubbo service interface is registered as an MCP (Mesh Control Plane) tool, is its metadata stored exclusively in local memory? Furthermore, are there any plans to register MCP tools with the MCP register in Nacos version 3? Is the Streamable HTTP protocol supported?

[zrlw]

There are many Chinese comments in the change commit.

Done.Translation completed.

no, there are still chinese comments. i.e. McpConstant.java

[RainYuY]

There are many Chinese comments in the change commit.

Done.Translation completed.

no, there are still chinese comments. i.e. McpConstant.java

You're right. done.

[RainYuY]

Dear Dubbo team: Once a Dubbo service interface is registered as an MCP (Mesh Control Plane) tool, is its metadata stored exclusively in local memory? Furthermore, are there any plans to register MCP tools with the MCP register in Nacos version 3? Is the Streamable HTTP protocol supported?

1. Is its metadata stored exclusively in local memory? Yes.

2. Furthermore, are there any plans to register MCP tools with the MCP registry in Nacos version 3? Under consideration.

3. Is the Streamable HTTP protocol supported? No, but I believe we will support it in the future.Now just sse.

[SpursJiang]

Dear Dubbo team: Once a Dubbo service interface is registered as an MCP (Mesh Control Plane) tool, is its metadata stored exclusively in local memory? Furthermore, are there any plans to register MCP tools with the MCP register in Nacos version 3? Is the Streamable HTTP protocol supported?

1. Is its metadata stored exclusively in local memory? Yes.
2. Furthermore, are there any plans to register MCP tools with the MCP registry in Nacos version 3? Under consideration.
3. Is the Streamable HTTP protocol supported? No, but I believe we will support it in the future.Now just sse.

OK👍

[RainYuY]

Since the mcp-java-sdk has not yet implemented server-side streamable support, I suggest we begin reviewing this Pull Request and proceed with using SSE as the first RC version. Once the streamable specification is implemented, we can release a second version. @AlbumenJ @zrlw @CrazyHZM @oxsean @heliang666s

[conghuhu]

Currently, this PR lacks a solution for multiple instances of MCP Server, which involves session sharing issues in cluster mode. However, the multi-instance solution is an enterprise-level solution, which can be implemented after this PR is merged

[zrlw]

check the reviews. @RainYuY

[zrlw]

@wcy666103 spotless:apply to fix code formatting issue.

[RainYuY]

@zrlw @AlbumenJ @CrazyHZM @songxiaosheng @heliang666s @EarthChen PTAL

[RainYuY]

A small suggestion: Disable MCP load by default

Others LGTM

Done