如何引用实体类型X的ManagedType<X>？

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.Metamodel;

public class Main {
    public static void main(String[] args) {
        // 创建EntityManagerFactory
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("your-persistence-unit-name");

        // 创建EntityManager
        EntityManager entityManager = entityManagerFactory.createEntityManager();

        // 获取Metamodel
        Metamodel metamodel = entityManager.getMetamodel();

        // 获取实体类型X的ManagedType<X>
        ManagedType<X> managedType = metamodel.managedType(X.class);

        // 打印ManagedType的信息
        System.out.println("ManagedType: " + managedType);

        // 关闭EntityManager和EntityManagerFactory
        entityManager.close();
        entityManagerFactory.close();
    }
}