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First of all, you should create a servlet and register the MCP server's HTTP handler. The SDK provides a servlet class for this purpose. Add this to your web application:

@WebServlet("/msg/*")
public class McpServlet extends HttpServlet {
    private final McpSyncServer server = MyMcpServer.create();
    
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) {
        server.handleRequest(req, resp);
    }
}

If you're not using @WebServlet annotation, register it in your web.xml:

<servlet>
    <servlet-name>mcpServlet</servlet-name>
    <servlet-class>com.yourpackage.McpServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>mcpServlet</servlet-name>
    <url-pattern>/msg/*</url-pattern>
</servlet-mapping>

The main thing is that HttpServletSseServerTransportProvider creates a transport that needs to be hooked into your servlet container's request handling pipeline. I am sure it should work perfectly now. Let me know in comments if you face same issue, I will guide you furthermore

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