JPA Repository findAll 带有可选字段

我有一个控制器尝试使用可选字段进行搜索.JPA实体类定义为:

I have a controller try to search with optional field. The JPA entity class is defined as:

package demo;

import javax.persistence.*;

@Entity
public class UploadFile {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private int id;
  private String name;

  public UploadFile() {
  }

  public UploadFile(String name) {
    this.name = name;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  @Override
  public String toString() {
    return "UploadFile{" +
        "id=" + id +
        ", name='" + name + '\'' +
        '}';
  }

}

控制器在以下代码中定义:

The controller is defined in the following code:

@RequestMapping(value = "/searchFile", method = RequestMethod.GET)
public @ResponseBody
List<UploadFile> searchFile(@RequestParam("id") Optional<Integer> id, @RequestParam("name") Optional<String> name) {
    UploadFile newFile = new UploadFile();
    if (id.isPresent()) {
        newFile.setId(id.get());
    }
    if (name.isPresent()) {
        newFile.setName(name.get());
    }
    System.out.println("new File: " + newFile);

    //uploadFileRepository is a JpaRepository Class
    return List<UploadFile> files = uploadFileRepository.findAll(Example.of(newFile));
}

数据库有一条记录:

ID      NAME    SIZE    TYPE  
1       index   111     html

当'/searchFile?id=1'命中服务器时，控制台打印:

When '/searchFile?id=1' hits server, the console prints:

new File: UploadFile{id=1, name='null'}

http 返回一个空数组:

The http returns an empty array:

我希望 /searchFile?id=1 返回 ID 为 1 的记录，以及 /searchFile?name=index 也返回 ID 为 1 的记录.

I want the /searchFile?id=1 to return the record with id 1, and also /searchFile?name=index to return the record with id 1 too.

我做错了什么吗?

谢谢！