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Fix NPE caused by response without id #509

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@quaff quaff commented Aug 22, 2025

Motivation and Context

Close GH-506

How Has This Been Tested?

I didn't find a way to write unit test due to the exception is thrown in private method and swallowed by reactor, but I observed reactor.core.Exceptions$ErrorCallbackNotImplemented: java.lang.NullPointerException: Cannot invoke "Object.hashCode()" because "key" is null is gone after this commit.

Breaking Changes

No

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Close modelcontextprotocolGH-506

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>
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Successfully merging this pull request may close these issues.

The McpClientSession.handle method throws a null pointer exception.
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