bug: ReadResourceResult serde issue (#77)

Author: sdelamo

micronaut-mcp-server-java-sdk/src/main/java/io/micronaut/mcp/server/json/McpSchemaSerdeImport.java

@@ -15,6 +15,7 @@
  */
 package io.micronaut.mcp.server.json;
 
+import com.fasterxml.jackson.annotation.JsonSubTypes;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.micronaut.context.annotation.ClassImport;
@@ -106,7 +107,12 @@ class CompleteCompletionMixin {
 
 }
 
-@Mixin.Filter(removeAnnotations = {"com.fasterxml.jackson.annotation.JsonTypeInfo", "io.micronaut.serde.config.annotation.SerdeConfig$SerError"})
+@Mixin.Filter(removeAnnotations = {
+    "com.fasterxml.jackson.annotation.JsonTypeInfo",
+    "com.fasterxml.jackson.annotation.JsonSubTypes",
+    "io.micronaut.serde.config.annotation.SerdeConfig$SerError",
+    "io.micronaut.serde.config.annotation.SerdeConfig$SerSubtyped"
+})
 @Mixin(McpSchema.ResourceContents.class)
 @JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION)
 class CorrectResourceContentsMixin {
@@ -121,5 +127,7 @@ class CorrectTextResourceContentsMixin {
 @Mixin.Filter(removeAnnotations = {"com.fasterxml.jackson.annotation.JsonTypeInfo", "io.micronaut.serde.config.annotation.SerdeConfig$SerError"})
 @Mixin(McpSchema.BlobResourceContents.class)
 @JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION)
+@JsonSubTypes({@JsonSubTypes.Type(value = McpSchema.TextResourceContents.class),
+    @JsonSubTypes.Type(value = McpSchema.BlobResourceContents.class)})
 class CorrectBlobResourceContentsMixin {
 }

micronaut-mcp-server-java-sdk/src/test/java/io/micronaut/mcp/server/serialization/ReadResourceResultSerializationTest.java

@@ -0,0 +1,30 @@
+package io.micronaut.mcp.server.serialization;
+
+import io.micronaut.json.JsonMapper;
+import io.micronaut.test.extensions.junit5.annotation.MicronautTest;
+import io.modelcontextprotocol.spec.McpSchema;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+@MicronautTest(startApplication = false)
+class ReadResourceResultSerializationTest {
+
+    @Test
+    void serialize(JsonMapper jsonMapper) {
+        //language=JSON
+        String json = """
+            {
+              "contents": [
+                {
+                  "uri": "guidemetadata://micronaut-oauth2-auth0",
+                  "mimeType": "application/json",
+                  "text": "{\\"title\\":\\"Secure a Micronaut application with Auth0\\",\\"intro\\":\\"Learn how to create a Micronaut application and secure it with an Authorization Server provided by Auth0.\\",\\"authors\\":[\\"Sergio del Amo\\"],\\"tags\\":[\\"security-jwt\\",\\"security\\",\\"authorization-code\\",\\"auth0\\",\\"graalvm\\",\\"thymeleaf\\",\\"oauth2\\",\\"oidc\\",\\"security-oauth2\\",\\"yaml\\"],\\"category\\":\\"Authorization Code\\",\\"publicationDate\\":\\"2021-09-03\\",\\"slug\\":\\"micronaut-oauth2-auth0\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0.html\\",\\"options\\":[{\\"buildTool\\":\\"GRADLE\\",\\"language\\":\\"JAVA\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0-gradle-java.html\\"},{\\"buildTool\\":\\"GRADLE\\",\\"language\\":\\"GROOVY\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0-gradle-groovy.html\\"},{\\"buildTool\\":\\"GRADLE\\",\\"language\\":\\"KOTLIN\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0-gradle-kotlin.html\\"},{\\"buildTool\\":\\"MAVEN\\",\\"language\\":\\"JAVA\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0-maven-java.html\\"},{\\"buildTool\\":\\"MAVEN\\",\\"language\\":\\"GROOVY\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0-maven-groovy.html\\"},{\\"buildTool\\":\\"MAVEN\\",\\"language\\":\\"KOTLIN\\",\\"url\\":\\"https://guides.micronaut.io/latest/micronaut-oauth2-auth0-maven-kotlin.html\\"}]}"
+                }
+              ]
+            }""";
+        assertDoesNotThrow(() -> jsonMapper.readValue(json, McpSchema.ReadResourceResult.class));
+    }
+}