MCP Java SDK: Simple Client

App.java

package org.fxapps.ollamamcp;

import java.util.Map;

import io.modelcontextprotocol.client.McpClient;
import io.modelcontextprotocol.client.transport.ServerParameters;
import io.modelcontextprotocol.client.transport.StdioClientTransport;
import io.modelcontextprotocol.spec.McpSchema.CallToolRequest;
import io.modelcontextprotocol.spec.McpSchema.TextContent;

public class App {
    private static final String[] SERVER_PARAMS = {
            "jdbc@quarkiverse/quarkus-mcp-servers"
    };

    public static void main(String[] args) {

        var params = ServerParameters.builder("jbang")
                .args(SERVER_PARAMS)
                .build();
        var transport = new StdioClientTransport(params);
        var client = McpClient.sync(transport).build();
        client.initialize();

        System.out.println("Available tools:");
        client.listTools()
                .tools()
                .stream()
                .map(tool -> tool.name() + ": " + tool.description())
                .forEach(System.out::println);

        System.out.println("Tools Parameters:");
        client.listTools()
                .tools()
                .stream()
                .forEach(tool -> {
                    System.out.println(tool.name() + "\n-");
                    var properties = tool.inputSchema().properties();
                    properties.forEach((k, v) -> {
                        System.out.println(k + ": " + v);
                    });
                    if (properties.isEmpty()) {
                        System.out.println("no params");
                    }
                    System.out.println("-----");
                });

        var sql = """
                CREATE TABLE users (
                    id INT PRIMARY KEY,
                    name VARCHAR(100),
                    age INT
                );
                """;
        var result = client.callTool(new CallToolRequest("write_query",
                Map.of("query", sql))).content();
        if (result.size() > 0 &&
                result.get(0) instanceof TextContent content) {
            System.out.println(content.text());
        }

        client.close();

    }
}

pom.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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.fxapps.ollamamcp</groupId>
  <artifactId>mcp-client</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>ollama-mcp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.release>24</maven.compiler.release>
    <maven.compiler.source>24</maven.compiler.source>
    <maven.compiler.target>24</maven.compiler.target>
    <mcpsdk.version>0.8.0</mcpsdk.version>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.modelcontextprotocol.sdk</groupId>
        <artifactId>mcp-bom</artifactId>
        <version>${mcpsdk.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>io.modelcontextprotocol.sdk</groupId>
      <artifactId>mcp</artifactId>
    </dependency>
  </dependencies>
</project>