Update copyright headers to 2025 and clean up code

- Add copyright headers to files missing them
- Add blank lines after copyright headers for consistency
- Remove unused imports in test files
- Remove unnecessary keep-alive warning logs in WebFlux and WebMvc transport providers

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

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.client;
 
 import java.time.Duration;

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

@@ -1,6 +1,7 @@
 /*
  * Copyright 2024-2024 the original author or authors.
  */
+
 package io.modelcontextprotocol.client;
 
 import java.time.Duration;

mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java

@@ -1,6 +1,7 @@
 /*
  * Copyright 2024 - 2025 the original author or authors.
  */
+
 package io.modelcontextprotocol.client.transport;
 
 import java.io.IOException;

mcp/src/main/java/io/modelcontextprotocol/client/transport/ResponseSubscribers.java

@@ -1,6 +1,7 @@
 /*
 * Copyright 2024 - 2024 the original author or authors.
 */
+
 package io.modelcontextprotocol.client.transport;
 
 import java.net.http.HttpResponse;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import io.modelcontextprotocol.spec.McpError;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import java.util.Map;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import io.modelcontextprotocol.spec.McpSchema;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import reactor.core.publisher.Mono;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import reactor.core.publisher.Mono;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import io.modelcontextprotocol.spec.McpSchema;

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

@@ -4,7 +4,6 @@
 
 package io.modelcontextprotocol.server;
 
-import io.modelcontextprotocol.server.McpServerFeatures.AsyncToolSpecification;
 import io.modelcontextprotocol.spec.McpSchema;
 import io.modelcontextprotocol.spec.McpSchema.LoggingMessageNotification;
 import io.modelcontextprotocol.util.Assert;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 import java.util.Collections;

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

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.server;
 
 /**

mcp/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java

@@ -1,6 +1,7 @@
 /*
  * Copyright 2024 - 2024 the original author or authors.
  */
+
 package io.modelcontextprotocol.server.transport;
 
 import java.io.BufferedReader;

mcp/src/main/java/io/modelcontextprotocol/spec/DefaultJsonSchemaValidator.java

@@ -1,6 +1,7 @@
 /*
  * Copyright 2024-2024 the original author or authors.
  */
+
 package io.modelcontextprotocol.spec;
 
 import java.util.Map;

mcp/src/main/java/io/modelcontextprotocol/spec/DefaultMcpStreamableServerSessionFactory.java

@@ -1,8 +1,11 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.spec;
 
 import io.modelcontextprotocol.server.McpNotificationHandler;
 import io.modelcontextprotocol.server.McpRequestHandler;
-import reactor.core.publisher.Mono;
 
 import java.time.Duration;
 import java.util.Map;

mcp/src/main/java/io/modelcontextprotocol/spec/DefaultMcpTransportSession.java

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.spec;
 
 import org.reactivestreams.Publisher;

mcp/src/main/java/io/modelcontextprotocol/spec/DefaultMcpTransportStream.java

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.spec;
 
 import org.reactivestreams.Publisher;

mcp/src/main/java/io/modelcontextprotocol/spec/HttpHeaders.java

@@ -1,3 +1,7 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
 package io.modelcontextprotocol.spec;
 
 /**

mcp/src/main/java/io/modelcontextprotocol/spec/JsonSchemaValidator.java

@@ -1,6 +1,7 @@
 /*
  * Copyright 2024-2024 the original author or authors.
  */
+
 package io.modelcontextprotocol.spec;
 
 import java.util.Map;