The bean ‘dataTokenMapper‘ could not be injected because it is a JDK dynamic

2024-04-02 21:14:11

文章目录

报错
- 翻译图片中的意思：
- 寻找目标：
- 分析原因：
解决方案

报错

运行项目的时候报错：
The bean ‘dataTokenMapper’ could not be injected because it is a JDK dynamic

翻译图片中的意思：

有个对象名叫dataTokenMapper，这个对象类型是个AttributeDataTokenMapper类型，但是却注入了DataTokenMapper类型，所以注入失败了。

寻找目标：

private AttributeDataTokenMapper dataTokenMapper;

发现确实有个地方是这样写的。

分析原因：

出现这个问题主要是两个因素导致的，缺一不可。
1.我有两个类，他们会生成两个代理类，分别是AttributeDataTokenMapper类和DataTokenMapper类。他们的代理对象的名称是类名首字母小写，attributeDataTokenMapper，dataTokenMapper

2.我使用他们的时候，使用的@Resource注入的，而@Resource的注入策略是：
①优先根据你的对象名注入，
比如我的@Resource标注的private AttributeDataTokenMapper dataTokenMapper
则，这里即使你的类型是AttributeDataTokenMapper，但是你的对象名是dataTokenMapper，则还是会注入DataTokenMapper类型的代理类。所以会出现上面的报错了
②通过@Resource的byType注入指定类型

解决方案

1.private AttributeDataTokenMapper dataTokenMapper 的注解@Resource改成@Autowired，因为@Autowired默认是byType注入
2.private AttributeDataTokenMapper dataTokenMapper 的注解@Resource使用byType指定类型，或者byName=attributeDataTokenMapper
3.private AttributeDataTokenMapper dataTokenMapper 的对象名称dataTokenMapper改成其他的

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