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filiphrfiliphr
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Add Support for Jackson 3 and use it by default
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17 files changed

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-16
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17 files changed

+1219
-16
lines changed

‎mcp-core/pom.xml‎

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@@ -80,7 +80,7 @@
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-annotations</artifactId>
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<version>${jackson.version}</version>
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<version>${jackson-annotations.version}</version>
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</dependency>
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<dependency>
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<!-- Test dependencies -->
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<dependency>
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<groupId>io.modelcontextprotocol.sdk</groupId>
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<artifactId>mcp-json-jackson2</artifactId>
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<artifactId>mcp-json-jackson3</artifactId>
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<version>0.18.0-SNAPSHOT</version>
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<scope>test</scope>
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</dependency>

‎mcp-core/src/test/java/io/modelcontextprotocol/spec/McpSchemaTests.java‎

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import org.junit.jupiter.api.Test;
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import com.fasterxml.jackson.databind.exc.InvalidTypeIdException;
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import tools.jackson.databind.exc.InvalidTypeIdException;
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import io.modelcontextprotocol.spec.McpSchema.TextResourceContents;
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import net.javacrumbs.jsonunit.core.Option;

‎mcp-json-jackson2/pom.xml‎

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@@ -11,7 +11,7 @@
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<artifactId>mcp-json-jackson2</artifactId>
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<packaging>jar</packaging>
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<name>Java MCP SDK JSON Jackson</name>
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<description>Java MCP SDK JSON implementation based on Jackson</description>
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<description>Java MCP SDK JSON implementation based on Jackson 2</description>
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<url>https://github.com/modelcontextprotocol/java-sdk</url>
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<scm>
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<url>https://github.com/modelcontextprotocol/java-sdk</url>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson.version}</version>
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<version>${jackson2.version}</version>
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</dependency>
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<dependency>
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<groupId>com.networknt</groupId>
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<artifactId>json-schema-validator</artifactId>
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<version>${json-schema-validator.version}</version>
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<version>${json-schema-validator-jackson2.version}</version>
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</dependency>
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<dependency>

‎mcp-json-jackson3/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.modelcontextprotocol.sdk</groupId>
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<artifactId>mcp-parent</artifactId>
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<version>0.18.0-SNAPSHOT</version>
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</parent>
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<artifactId>mcp-json-jackson3</artifactId>
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<packaging>jar</packaging>
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<name>Java MCP SDK JSON Jackson</name>
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<description>Java MCP SDK JSON implementation based on Jackson 3</description>
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<url>https://github.com/modelcontextprotocol/java-sdk</url>
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<scm>
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<url>https://github.com/modelcontextprotocol/java-sdk</url>
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<connection>git://github.com/modelcontextprotocol/java-sdk.git</connection>
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<developerConnection>git@github.com/modelcontextprotocol/java-sdk.git</developerConnection>
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</scm>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<configuration>
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<archive>
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<manifest>
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<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>io.modelcontextprotocol.sdk</groupId>
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<artifactId>mcp-json</artifactId>
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<version>0.18.0-SNAPSHOT</version>
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</dependency>
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<dependency>
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<groupId>tools.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson3.version}</version>
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</dependency>
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<dependency>
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<groupId>com.networknt</groupId>
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<artifactId>json-schema-validator</artifactId>
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<version>${json-schema-validator-jackson3.version}</version>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assert4j.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-params</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
72+
<groupId>org.mockito</groupId>
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<artifactId>mockito-core</artifactId>
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<version>${mockito.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎mcp-json-jackson3/src/main/java/io/modelcontextprotocol/json/jackson3/JacksonMcpJsonMapper.java‎

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/*
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* Copyright 2026 - 2026 the original author or authors.
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*/
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package io.modelcontextprotocol.json.jackson3;
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import io.modelcontextprotocol.json.McpJsonMapper;
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import io.modelcontextprotocol.json.TypeRef;
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import tools.jackson.databind.JavaType;
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import tools.jackson.databind.json.JsonMapper;
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/**
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* Jackson-based implementation of JsonMapper. Wraps a Jackson JsonMapper but keeps the
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* SDK decoupled from Jackson at the API level.
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*/
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public final class JacksonMcpJsonMapper implements McpJsonMapper {
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private final JsonMapper jsonMapper;
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/**
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* Constructs a new JacksonMcpJsonMapper instance with the given JsonMapper.
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* @param jsonMapper the JsonMapper to be used for JSON serialization and
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* deserialization. Must not be null.
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* @throws IllegalArgumentException if the provided JsonMapper is null.
26+
*/
27+
public JacksonMcpJsonMapper(JsonMapper jsonMapper) {
28+
if (jsonMapper == null) {
29+
throw new IllegalArgumentException("JsonMapper must not be null");
30+
}
31+
this.jsonMapper = jsonMapper;
32+
}
33+
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/**
35+
* Returns the underlying Jackson {@link JsonMapper} used for JSON serialization and
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* deserialization.
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* @return the JsonMapper instance
38+
*/
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public JsonMapper getJsonMapper() {
40+
return jsonMapper;
41+
}
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43+
@Override
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public <T> T readValue(String content, Class<T> type) {
45+
return jsonMapper.readValue(content, type);
46+
}
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48+
@Override
49+
public <T> T readValue(byte[] content, Class<T> type) {
50+
return jsonMapper.readValue(content, type);
51+
}
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53+
@Override
54+
public <T> T readValue(String content, TypeRef<T> type) {
55+
JavaType javaType = jsonMapper.getTypeFactory().constructType(type.getType());
56+
return jsonMapper.readValue(content, javaType);
57+
}
58+
59+
@Override
60+
public <T> T readValue(byte[] content, TypeRef<T> type) {
61+
JavaType javaType = jsonMapper.getTypeFactory().constructType(type.getType());
62+
return jsonMapper.readValue(content, javaType);
63+
}
64+
65+
@Override
66+
public <T> T convertValue(Object fromValue, Class<T> type) {
67+
return jsonMapper.convertValue(fromValue, type);
68+
}
69+
70+
@Override
71+
public <T> T convertValue(Object fromValue, TypeRef<T> type) {
72+
JavaType javaType = jsonMapper.getTypeFactory().constructType(type.getType());
73+
return jsonMapper.convertValue(fromValue, javaType);
74+
}
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@Override
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public String writeValueAsString(Object value) {
78+
return jsonMapper.writeValueAsString(value);
79+
}
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81+
@Override
82+
public byte[] writeValueAsBytes(Object value) {
83+
return jsonMapper.writeValueAsBytes(value);
84+
}
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86+
}

‎mcp-json-jackson3/src/main/java/io/modelcontextprotocol/json/jackson3/JacksonMcpJsonMapperSupplier.java‎

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/*
2+
* Copyright 2026 - 2026 the original author or authors.
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*/
4+
5+
package io.modelcontextprotocol.json.jackson3;
6+
7+
import tools.jackson.databind.json.JsonMapper;
8+
9+
import io.modelcontextprotocol.json.McpJsonMapper;
10+
import io.modelcontextprotocol.json.McpJsonMapperSupplier;
11+
12+
/**
13+
* A supplier of {@link McpJsonMapper} instances that uses the Jackson library for JSON
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* serialization and deserialization.
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* <p>
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* This implementation provides a {@link McpJsonMapper} backed by a Jackson
17+
* {@link JsonMapper}.
18+
*/
19+
public class JacksonMcpJsonMapperSupplier implements McpJsonMapperSupplier {
20+
21+
/**
22+
* Returns a new instance of {@link McpJsonMapper} that uses the Jackson library for
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* JSON serialization and deserialization.
24+
* <p>
25+
* The returned {@link McpJsonMapper} is backed by a new instance of
26+
* {@link tools.jackson.databind.json.JsonMapper}.
27+
* @return a new {@link McpJsonMapper} instance
28+
*/
29+
@Override
30+
public McpJsonMapper get() {
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return new JacksonMcpJsonMapper(JsonMapper.shared());
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}
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}

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