java-sdk/mcp-json/pom.xml
Graeme Rocher 80d0ad82a6 feat: Introduce McpJsonMapper interface to decouple from Jackson (#543)
This pull request creates two modules, `mcp-json` and `mcp-json-jackson`. It removes the `com.fasterxml.jackson.core:jackson-databind` and `com.networknt:json-schema-validator` dependencies from the `mcp` module. The `mcp` module now only depends on `com.fasterxml.jackson.core:jackson-annotations`.

To use Jackson, you have to add `mcp-jackson` to your dependencies in addition to `mcp`. I added the dependency `mcp-jackson` to both `mcp-spring-mvc` and `mcp-spring-webflux` to avoid a breaking change in those modules.

It provides two [SPI](https://docs.oracle.com/javase/tutorial/sound/SPI-intro.html) `JsonSchemaValidatorSupplier` and `JacksonJsonSchemaValidatorSupplier` to allow easy replacement for consumers who don't want to use Jackson.

This pull request also ensures no `McpJsonMapper` is instantiated if one is provided via a builder method. Only if the builders don't receive a `McpJsonMapper` mapper, one is instantiated in the `build` method of the builder.
The logic behind this is to allow frameworks to provide a `McpJsonMapper` mapper singleton implementation and feed it to the builders without paying the price of instantiating `McpJsonMappers`, which will not be used. The goal is to be able to use the `ObjectMapper` singleton of an application also for the MCP code.

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>
2025-09-15 15:51:06 +02:00

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XML

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>io.modelcontextprotocol.sdk</groupId>
<artifactId>mcp-parent</artifactId>
<version>0.13.0-SNAPSHOT</version>
</parent>
<artifactId>mcp-json</artifactId>
<packaging>jar</packaging>
<name>Java MCP SDK JSON Support</name>
<description>Java MCP SDK JSON Support API</description>
<url>https://github.com/modelcontextprotocol/java-sdk</url>
<scm>
<url>https://github.com/modelcontextprotocol/java-sdk</url>
<connection>git://github.com/modelcontextprotocol/java-sdk.git</connection>
<developerConnection>git@github.com/modelcontextprotocol/java-sdk.git</developerConnection>
</scm>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
</dependencies>
</project>