Refine meta-schema loading and deprecate orphan JsonSchemaValidator

Signed-off-by: Dariusz Jędrzejczyk <2554306+chemicL@users.noreply.github.com>

Author: chemicL

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

@@ -11,7 +11,9 @@
  * defines a method to validate structured content based on the provided output schema.
  *
  * @author Christian Tzolov
+ * @deprecated Use {@link io.modelcontextprotocol.json.schema.JsonSchemaValidator}
  */
+@Deprecated
 public interface JsonSchemaValidator {
 
 	/**

mcp-json-jackson2/src/main/java/io/modelcontextprotocol/json/schema/jackson2/DefaultJsonSchemaValidator.java

@@ -3,12 +3,11 @@
  */
 package io.modelcontextprotocol.json.schema.jackson2;
 
-import java.io.IOException;
-import java.io.InputStream;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import com.networknt.schema.SchemaLocation;
 import io.modelcontextprotocol.util.Assert;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -52,23 +51,8 @@ public DefaultJsonSchemaValidator(ObjectMapper objectMapper) {
 		this.objectMapper = objectMapper;
 		this.schemaFactory = SchemaRegistry.withDefaultDialect(Dialects.getDraft202012());
 		this.schemaCache = new ConcurrentHashMap<>();
-		this.metaSchema202012 = loadMetaSchema();
-	}
-
-	private Schema loadMetaSchema() {
-		try (InputStream stream = getClass().getClassLoader().getResourceAsStream("draft/2020-12/schema")) {
-			if (stream == null) {
-				logger.warn(
-						"JSON Schema 2020-12 meta-schema not found on classpath; schema conformance checking disabled");
-				return null;
-			}
-			return this.schemaFactory.getSchema(stream);
-		}
-		catch (IOException e) {
-			logger.warn("Failed to load JSON Schema 2020-12 meta-schema: {}; schema conformance checking disabled",
-					e.getMessage());
-			return null;
-		}
+		this.metaSchema202012 = schemaFactory
+			.getSchema(SchemaLocation.of("https://json-schema.org/draft/2020-12/schema"));
 	}
 
 	@Override

mcp-json-jackson3/src/main/java/io/modelcontextprotocol/json/schema/jackson3/DefaultJsonSchemaValidator.java

@@ -3,13 +3,12 @@
  */
 package io.modelcontextprotocol.json.schema.jackson3;
 
-import java.io.IOException;
-import java.io.InputStream;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import com.networknt.schema.Schema;
+import com.networknt.schema.SchemaLocation;
 import com.networknt.schema.SchemaRegistry;
 import com.networknt.schema.Error;
 import com.networknt.schema.dialect.Dialects;
@@ -51,23 +50,8 @@ public DefaultJsonSchemaValidator(JsonMapper jsonMapper) {
 		this.jsonMapper = jsonMapper;
 		this.schemaFactory = SchemaRegistry.withDefaultDialect(Dialects.getDraft202012());
 		this.schemaCache = new ConcurrentHashMap<>();
-		this.metaSchema202012 = loadMetaSchema();
-	}
-
-	private Schema loadMetaSchema() {
-		try (InputStream stream = getClass().getClassLoader().getResourceAsStream("draft/2020-12/schema")) {
-			if (stream == null) {
-				logger.warn(
-						"JSON Schema 2020-12 meta-schema not found on classpath; schema conformance checking disabled");
-				return null;
-			}
-			return this.schemaFactory.getSchema(stream);
-		}
-		catch (IOException e) {
-			logger.warn("Failed to load JSON Schema 2020-12 meta-schema: {}; schema conformance checking disabled",
-					e.getMessage());
-			return null;
-		}
+		this.metaSchema202012 = schemaFactory
+			.getSchema(SchemaLocation.of("https://json-schema.org/draft/2020-12/schema"));
 	}
 
 	@Override