1、问题

在项目升级版本过程中，@Autowired提示Field injection is not recommended

Field injection is not recommended 
 Inspection info:
Reports injected or autowired fields in Spring components.
The quick-fix suggests the recommended constructor-based dependency injection in beans and assertions for mandatory fields.
Example:
class MyComponent {
  @Inject MyCollaborator collaborator; // injected field

  public void myBusinessMethod() {
    collaborator.doSomething(); // throws NullPointerException
  }
}
 
After applying the quick-fix:
class MyComponent {

  private final MyCollaborator collaborator;

  @Inject
  public MyComponent(MyCollaborator collaborator) {
    Assert.notNull(collaborator, "MyCollaborator must not be null!");
    this.collaborator = collaborator;
  }

  public void myBusinessMethod() {
    collaborator.doSomething(); // now this call is safe
  }
}

2、原因

重点应该在这一句

The quick-fix suggests the recommended constructor-based dependency injection in beans and assertions for mandatory fields.

其实就是要基于构造函数进行依赖注入，估计有可能会在未来某个版本会删除该用法吧。

3、解决

把 import org.springframework.beans.factory.annotation.Autowired;
替换成
import jakarta.annotation.Resource;

问题解决。

OK，就这些吧。
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