feat: implement AutoCloseable for MCP client and server classes

- Implement AutoCloseable interface for McpAsyncClient, McpAsyncServer, and McpSyncServer
- Refactor test methods to use try-with-resources for automatic resource cleanup
- Add missing Javadoc for McpSyncServerExchange.setMinLoggingLevel
- Change visibility of McpAsyncServerExchange.setMinLoggingLevel to package-private

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/WebFluxSseIntegrationTests.java

@@ -75,7 +75,7 @@
  * @see McpSchema
  * @see McpClientSession
  */
-public class McpAsyncClient {
+public class McpAsyncClient implements AutoCloseable {
 
 	private static final Logger logger = LoggerFactory.getLogger(McpAsyncClient.class);
 
@@ -275,6 +275,7 @@ public McpSchema.Implementation getClientInfo() {
 	/**
 	 * Closes the client connection immediately.
 	 */
+	@Override
 	public void close() {
 		this.mcpSession.close();
 	}

mcp-spring/mcp-spring-webmvc/src/test/java/io/modelcontextprotocol/server/WebMvcSseIntegrationTests.java

@@ -72,7 +72,7 @@
  * @see McpSchema
  * @see McpClientSession
  */
-public class McpAsyncServer {
+public class McpAsyncServer implements AutoCloseable {
 
 	private static final Logger logger = LoggerFactory.getLogger(McpAsyncServer.class);
 
@@ -121,6 +121,7 @@ public Mono<Void> closeGracefully() {
 	/**
 	 * Close the server immediately.
 	 */
+	@Override
 	public void close() {
 		this.delegate.close();
 	}

mcp/src/main/java/io/modelcontextprotocol/client/McpAsyncClient.java

@@ -135,7 +135,7 @@ public Mono<Void> loggingNotification(LoggingMessageNotification loggingMessageN
 	 * filtered out.
 	 * @param minLoggingLevel The minimum logging level
 	 */
-	public void setMinLoggingLevel(LoggingLevel minLoggingLevel) {
+	void setMinLoggingLevel(LoggingLevel minLoggingLevel) {
 		Assert.notNull(minLoggingLevel, "minLoggingLevel must not be null");
 		this.session.setMinLoggingLevel(minLoggingLevel);
 	}

mcp/src/main/java/io/modelcontextprotocol/server/McpAsyncServer.java

@@ -46,7 +46,7 @@
  * @see McpAsyncServer
  * @see McpSchema
  */
-public class McpSyncServer {
+public class McpSyncServer implements AutoCloseable {
 
 	/**
 	 * The async server to wrap.
@@ -157,6 +157,7 @@ public void closeGracefully() {
 	/**
 	 * Close the server immediately.
 	 */
+	@Override
 	public void close() {
 		this.asyncServer.close();
 	}

mcp/src/main/java/io/modelcontextprotocol/server/McpAsyncServerExchange.java

@@ -92,6 +92,11 @@ public Mono<Void> loggingNotification(LoggingMessageNotification loggingMessageN
 		return this.exchange.loggingNotification(loggingMessageNotification);
 	}
 
+	/**
+	 * Set the minimum logging level for the client. Messages below this level will be
+	 * filtered out.
+	 * @param minLoggingLevel The minimum logging level
+	 */
 	void setMinLoggingLevel(LoggingLevel minLoggingLevel) {
 		this.exchange.setMinLoggingLevel(minLoggingLevel);
 	}

mcp/src/main/java/io/modelcontextprotocol/server/McpSyncServer.java

@@ -8,7 +8,6 @@
 import io.modelcontextprotocol.client.transport.HttpClientSseClientTransport;
 import io.modelcontextprotocol.server.McpServer;
 import io.modelcontextprotocol.spec.McpSchema;
-import org.apache.catalina.Context;
 import org.apache.catalina.LifecycleException;
 import org.apache.catalina.LifecycleState;
 import org.apache.catalina.startup.Tomcat;
@@ -78,9 +77,12 @@ public void after() {
 
 	@Test
 	void testCustomContextPath() {
-		McpServer.async(mcpServerTransportProvider).serverInfo("test-server", "1.0.0").build();
-		var client = clientBuilder.clientInfo(new McpSchema.Implementation("Sample " + "client", "0.0.0")).build();
-		assertThat(client.initialize()).isNotNull();
+		try (//@formatter:off
+			var server = McpServer.async(mcpServerTransportProvider).serverInfo("test-server", "1.0.0").build();
+			var client = clientBuilder.clientInfo(new McpSchema.Implementation("Sample " + "client", "0.0.0")) .build()) { //@formatter:on
+
+			assertThat(client.initialize()).isNotNull();
+		}
 	}
 
 }