dongrade java version from 21 to 17

mcp-core/pom.xml

@@ -22,8 +22,8 @@
 		<url />
 	</scm>
 	<properties>
-		<java.version>21</java.version>
+		<java.version>17</java.version>
-		<maven.compiler.release>21</maven.compiler.release>
+		<maven.compiler.release>17</maven.compiler.release>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -60,16 +60,6 @@
 			<scope>test</scope>
 		</dependency>
 
-		<!-- <dependency>
-			<groupId>org.springframework.ai</groupId>
-			<artifactId>spring-ai-openai-spring-boot-starter</artifactId>
-		</dependency> -->
-
-		<!-- <dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-test</artifactId>
-			<scope>test</scope>
-		</dependency> -->
 	</dependencies>
 	<dependencyManagement>
 		<dependencies>
@@ -80,14 +70,6 @@
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>
-
-			<!-- <dependency>
-				<groupId>org.springframework.ai</groupId>
-				<artifactId>spring-ai-bom</artifactId>
-				<version>${spring-ai.version}</version>
-				<type>pom</type>
-				<scope>import</scope>
-			</dependency> -->
 		</dependencies>
 	</dependencyManagement>
 
@@ -97,14 +79,7 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.12.1</version>
-				<!-- <configuration>
-					<release>7</release>
-				</configuration> -->
 			</plugin>
-			<!-- <plugin>
-				<groupId>org.springframework.boot</groupId>
-				<artifactId>spring-boot-maven-plugin</artifactId>
-			</plugin> -->
 		</plugins>
 	</build>
 	<repositories>

mcp-core/src/main/java/spring/ai/experimental/mcp/spec/DefaultMcpSession.java

@@ -38,21 +38,18 @@ public class DefaultMcpSession implements McpSession {
 		this.transport = transport;
 
 		this.transport.setInboudMessageHandler(message -> {
-			switch (message) {
+
-				case McpSchema.JSONRPCResponse response -> {
+			if ( message instanceof McpSchema.JSONRPCResponse response) {
-					var sink = pendingResponses.remove(response.id());
+				var sink = pendingResponses.remove(response.id());
-					if (sink == null) {
+				if (sink == null) {
-						System.out.println("Unexpected response for unkown id " + response.id());
+					System.out.println("Unexpected response for unkown id " + response.id());
-					} else {
+				} else {
-						sink.success(response);
+					sink.success(response);
-					}
-				}
-				case McpSchema.JSONRPCRequest request -> {
-					System.out.println("Client does not yet support server requests");
-				}
-				case McpSchema.JSONRPCNotification notification -> {
-					System.out.println("Notifications not yet supported");
 				}
+			} else if ( message instanceof McpSchema.JSONRPCRequest request) {
+				System.out.println("Client does not yet support server requests");
+			} else if ( message instanceof McpSchema.JSONRPCNotification notification) {
+				System.out.println("Notifications not yet supported");
 			}
 		});
 

mcp-spring-boot/pom.xml

@@ -28,7 +28,7 @@
 		<url />
 	</scm>
 	<properties>
-		<java.version>21</java.version>
+		<java.version>17</java.version>
 		<spring-ai.version>1.0.0-M4</spring-ai.version>
 	</properties>
 	<dependencies>

mcp-spring/pom.xml

@@ -22,7 +22,7 @@
 		<url />
 	</scm>
 	<properties>
-		<java.version>21</java.version>
+		<java.version>17</java.version>
 		<spring-ai.version>1.0.0-M4</spring-ai.version>
 	</properties>
 	<dependencies>

pom.xml

@@ -24,7 +24,7 @@
 		<url />
 	</scm>
 	<properties>
-		<java.version>21</java.version>
+		<java.version>17</java.version>
 		<spring-ai.version>1.0.0-M4</spring-ai.version>
 	</properties>
 	<modules>