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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