使用jpa remove删除对象

请有人帮我一下

ManagedBean

public Customer deleteCustomer(Customer customer){
    BookstoreManager.getInstance().deleteCustomer(customer);
    System.out.println("Customer deleted" + customer.getFirstName());
    return  null;
}

商务物流

public Customer deleteCustomer(Customer deletedCustomer) {
    try {
        em.getTransaction().begin();
        Customer customer = new Customer();
        em.remove(customer);
        em.getTransaction().commit();
    } catch (Exception e) {
        em.getTransaction().rollback();
        e.printStackTrace();
        System.out.println("Hello from delete");
    }
    return null;
}

错误消息

信息：HH000114:在删除处理中处理临时实体

---

你的意思是

em.remove（deletedCustomer）

只能删除状态为托管的实体。

Source
为什么要在deleteCustomer方法中实例化新客户？这会导致错误，只需传递方法参数中的一个，您的答案就是解决方案。谢谢你的帮助。
public Customer deleteCustomer(Customer deletedCustomer) {
    try {
        em.getTransaction().begin();
        em.remove(deletedCustomer);
        em.getTransaction().commit();
    } catch (Exception e) {
        em.getTransaction().rollback();
        e.printStackTrace();
        System.out.println("Hello from delete");
    }
    return null;
}