feat: refactor ObjectMapper configuration to use McpServerObjectMapperFactory

Signed-off-by: liugddx <[email protected]>

Author: liugddx

auto-configurations/mcp/spring-ai-autoconfigure-mcp-server-common/src/main/java/org/springframework/ai/mcp/server/common/autoconfigure/McpServerAutoConfiguration.java

@@ -21,11 +21,7 @@
 import java.util.function.BiConsumer;
 import java.util.function.BiFunction;
 
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.SerializationFeature;
-import com.fasterxml.jackson.databind.json.JsonMapper;
 import io.modelcontextprotocol.json.jackson.JacksonMcpJsonMapper;
 import io.modelcontextprotocol.server.McpAsyncServer;
 import io.modelcontextprotocol.server.McpAsyncServerExchange;
@@ -54,7 +50,6 @@
 
 import org.springframework.ai.mcp.server.common.autoconfigure.properties.McpServerChangeNotificationProperties;
 import org.springframework.ai.mcp.server.common.autoconfigure.properties.McpServerProperties;
-import org.springframework.ai.util.JacksonUtils;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
@@ -114,18 +109,7 @@ public class McpServerAutoConfiguration {
 	@Bean(name = "mcpServerObjectMapper")
 	@ConditionalOnMissingBean(name = "mcpServerObjectMapper")
 	public ObjectMapper mcpServerObjectMapper() {
-		return JsonMapper.builder()
-			// Deserialization configuration
-			.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
-			.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT)
-			// Serialization configuration
-			.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
-			.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
-			.serializationInclusion(JsonInclude.Include.NON_NULL)
-			// Register standard modules (Jdk8, JavaTime, ParameterNames, Kotlin if
-			// available)
-			.addModules(JacksonUtils.instantiateAvailableModules())
-			.build();
+		return McpServerObjectMapperFactory.createObjectMapper();
 	}
 
 	@Bean

auto-configurations/mcp/spring-ai-autoconfigure-mcp-server-common/src/main/java/org/springframework/ai/mcp/server/common/autoconfigure/McpServerObjectMapperFactory.java

@@ -45,13 +45,8 @@
  * <li><b>Jackson Modules:</b> Registers standard modules for Java 8, JSR-310, parameter
  * names, and Kotlin (if available)</li>
  * </ul>
- * <p>
- * This factory was introduced to fix Issue #4451 where @McpTool annotated methods failed
- * to load with STDIO protocol due to JSON serialization errors caused by using an
- * unconfigured ObjectMapper instance.
  *
  * @author Spring AI Team
- * @see <a href="https://github.com/spring-projects/spring-ai/issues/4451">Issue #4451</a>
  */
 public final class McpServerObjectMapperFactory {
 

auto-configurations/mcp/spring-ai-autoconfigure-mcp-server-common/src/test/java/org/springframework/ai/mcp/server/common/autoconfigure/McpToolWithStdioIT.java

@@ -41,12 +41,6 @@
 
 /**
  * Integration tests for @McpTool annotations with STDIO transport.
- * <p>
- * This test verifies the fix for Issue #4451 where @McpTool annotated methods failed to
- * load when using STDIO protocol due to JSON serialization issues with unconfigured
- * ObjectMapper.
- *
- * @see <a href="https://github.com/spring-projects/spring-ai/issues/4451">Issue #4451</a>
  */
 public class McpToolWithStdioIT {
 
@@ -92,10 +86,7 @@ void stdioTransportShouldUseConfiguredObjectMapper() {
 
 	/**
 	 * Verifies that @McpTool annotated methods are successfully registered with STDIO
-	 * transport.
-	 * <p>
-	 * This is the core test for Issue #4451 - it ensures that tool specifications
-	 * generated from @McpTool annotations can be properly serialized to JSON without
+	 * transport and that tool specifications can be properly serialized to JSON without
 	 * errors.
 	 */
 	@Test