Make mcpHandler volatile and contextExtractor final

Author: Randgalt

mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStatelessServerTransport.java

@@ -52,9 +52,9 @@ public class HttpServletStatelessServerTransport extends HttpServlet implements
 
 	private final String mcpEndpoint;
 
-	private McpStatelessServerHandler mcpHandler;
+	private volatile McpStatelessServerHandler mcpHandler;
 
-	private McpTransportContextExtractor<HttpServletRequest> contextExtractor;
+	private final McpTransportContextExtractor<HttpServletRequest> contextExtractor;
 
 	private volatile boolean isClosing = false;
 

mcp-spring/mcp-spring-webflux/src/main/java/io/modelcontextprotocol/server/transport/WebFluxStatelessServerTransport.java

@@ -4,8 +4,8 @@
 
 package io.modelcontextprotocol.server.transport;
 
-import io.modelcontextprotocol.json.McpJsonMapper;
 import io.modelcontextprotocol.common.McpTransportContext;
+import io.modelcontextprotocol.json.McpJsonMapper;
 import io.modelcontextprotocol.server.McpStatelessServerHandler;
 import io.modelcontextprotocol.server.McpTransportContextExtractor;
 import io.modelcontextprotocol.spec.McpError;
@@ -40,9 +40,9 @@ public class WebFluxStatelessServerTransport implements McpStatelessServerTransp
 
 	private final RouterFunction<?> routerFunction;
 
-	private McpStatelessServerHandler mcpHandler;
+	private volatile McpStatelessServerHandler mcpHandler;
 
-	private McpTransportContextExtractor<ServerRequest> contextExtractor;
+	private final McpTransportContextExtractor<ServerRequest> contextExtractor;
 
 	private volatile boolean isClosing = false;
 

mcp-spring/mcp-spring-webmvc/src/main/java/io/modelcontextprotocol/server/transport/WebMvcStatelessServerTransport.java

@@ -44,9 +44,9 @@ public class WebMvcStatelessServerTransport implements McpStatelessServerTranspo
 
 	private final RouterFunction<ServerResponse> routerFunction;
 
-	private McpStatelessServerHandler mcpHandler;
+	private volatile McpStatelessServerHandler mcpHandler;
 
-	private McpTransportContextExtractor<ServerRequest> contextExtractor;
+	private final McpTransportContextExtractor<ServerRequest> contextExtractor;
 
 	private volatile boolean isClosing = false;