Java 生态周报：GraalVM 加速发布、Spring AI 2.0 推进、Quarkus MCP Agent 登场

# 在 CI 中固定 GraalVM 版本，避免意外升级导致构建失败
export GRAALVM_HOME="$HOME/.graalvm/graalvm-jdk-25_25.0.2"
# 升级验证流水线：拉最新版并跑 native 构建
gu install native-image
mvn -Pnative package -DskipTests
# 构建成功后跑集成测试
./target/myapp --server.port=8081 &
curl -sf http://localhost:8081/actuator/health || exit 1
kill %1

# application.yml — Spring AI 2.0 M6 + Ollama 本地模型
spring:
  ai:
    ollama:
      base-url: http://localhost:11434
      chat:
        model: llama3.2
        options:
          temperature: 0.7

// ChatController.java — 最简问答端点
@RestController
@RequestMapping("/chat")
public class ChatController {

    private final ChatClient chatClient;

    public ChatController(ChatClient.Builder builder) {
        this.chatClient = builder.build();
    }

    @GetMapping
    public String ask(@RequestParam String question) {
        return chatClient.prompt()
                .user(question)
                .call()
                .content();
    }

    // 流式响应端点，适合前端逐字渲染
    @GetMapping(value = "/stream", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public Flux<String> stream(@RequestParam String question) {
        return chatClient.prompt()
                .user(question)
                .stream()
                .content();
    }
}

# 启动 Ollama 并拉取模型
ollama serve
ollama pull llama3.2

# 启动 Spring Boot 应用
mvn spring-boot:run

# 测试
curl "http://localhost:8080/chat?question=Java%20值类型%20和%20普通类%20有什么区别"

// McpTools.java — 在 Quarkus 中注册一个 MCP 工具
@McpTool(name = "query_order", description = "根据订单 ID 查询订单状态")
public class OrderQueryTool {

    @Inject
    OrderService orderService;

    @ToolOperation
    public ToolResult query(@ToolParam(name = "orderId", description = "订单 ID") String orderId) {
        Order order = orderService.findById(orderId);
        if (order == null) {
            return ToolResult.error("订单不存在: " + orderId);
        }
        return ToolResult.success(Map.of(
            "orderId", order.getId(),
            "status", order.getStatus().name(),
            "total", order.getTotal()
        ));
    }
}

# 添加 Quarkus MCP Agent 扩展
quarkus extension add quarkus-agent-mcp-server

# 开发模式启动
mvn quarkus:dev

# MCP Server 默认暴露 SSE 端点，AI 客户端可连接
# 端点地址：http://localhost:8080/mcp/sse