java-tutorials/java-mcp/src/main/java/mcp/McpClientApp2.java at master · oforero/java-tutorials

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package mcp;

import java.io.IOException;

import java.util.Map;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;

import io.modelcontextprotocol.client.McpClient;

import io.modelcontextprotocol.client.McpSyncClient;

import io.modelcontextprotocol.client.transport.ServerParameters;

import io.modelcontextprotocol.client.transport.StdioClientTransport;

import io.modelcontextprotocol.json.jackson.JacksonMcpJsonMapper;

import io.modelcontextprotocol.spec.McpClientTransport;

import io.modelcontextprotocol.spec.McpSchema.CallToolRequest;

import io.modelcontextprotocol.spec.McpSchema.CallToolResult;

import io.modelcontextprotocol.spec.McpSchema.ListToolsResult;

public class McpClientApp2 {

private static final Logger log = LoggerFactory.getLogger(McpClientApp2.class);

public static void main(String[] args) {

String jarPath = new java.io.File("java-mcp/target/java-mcp-1.0.0-SNAPSHOT.jar").getAbsolutePath();

ServerParameters params = ServerParameters.builder("java")

.args("-jar", jarPath)

.build();

JacksonMcpJsonMapper jsonMapper = new JacksonMcpJsonMapper(new ObjectMapper());

McpClientTransport transport = new StdioClientTransport(params, jsonMapper);

McpSyncClient client = McpClient.sync(transport)

.build();

client.initialize();

ListToolsResult tools = client.listTools();

McpClientApp2.log.info("Tools exposed by the server:");

tools.tools()

.forEach(tool -> System.out.println(" - " + tool.name()));

McpClientApp2.log.info("\nCalling 'logPrompt' tool...");

CallToolResult result = client.callTool(new CallToolRequest("logPrompt", Map.of("prompt", "Hello from MCP client!")));

McpClientApp2.log.info("Result: " + result.content());

client.closeGracefully();

}