[BUG] McpSyncClientCustomizer sampling method has concurrency safety issues with shared state #4127
Description
There are concurrency safety issues in the sampling method of McpSyncClientCustomizer. When multiple MCP clients send requests simultaneously, it may lead to model routing errors and exceptions.
running code : https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/sampling
code location: https://github.com/spring-projects/spring-ai-examples/blob/main/model-context-protocol/sampling/mcp-weather-webmvc-server/src/main/java/org/springframework/ai/mcp/sample/server/WeatherService.java
then , client code will lead to model routing errors :
code location :
