新增Java文章

dsencheng · Sep 18, 2023 · aef5b90 · aef5b90
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+---
+title: "Java NoUniqueBeanDefinitionException"
+date: 2023-09-18T17:01:30+08:00
+draft: false
+tags: ["Java"]
+categories: ["Java"]
+---
+
+在使用Spring Web + Mybatis-plus + MybatisX插件，创建Java工程后，启动时总是报不唯一的bean，反复检查了几遍，也没有找到问题。
+
+```
+Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.coding.generator.service.ApiNotesService' available: expected single matching bean but found 2: apiNotesServiceImpl,apiNotesService
+```
+
+经过搜索，找到了2种解决方法
+
+1. 按名字匹配注入
+    ```
+    @Resource(name = "apiNotesServiceImpl")
+    private ApiNotesService notesService;
+    ```
+    或者
+    ```
+    @Autowired
+    @Qualifier("apiNotesServiceImpl")
+    private ApiNotesService notesService;
+    ```
+2. 提供准确的`@MapperScan`路径
+   ```
+   @MapperScan("com.coding.generator.mapper")
+   ```