No qualifying bean of type [java.lang.String] is defined: expected single matching bean but found 2

墨蓝 2023-10-03 18:31 23阅读 0赞

错误信息：

No qualifying bean of type [java.lang.String] is defined: expected single matching bean but found 2: appclientApplication,slfclientApplication

具体场景：  
service

@Resource
        private String appclientApplicationName;
        @Resource
        private String slfclientApplicationName;

xml

结果在项目启动时报错：

No qualifying bean of type [java.lang.String] is defined: expected single matching bean but found 2: appclientApplication,slfclientApplication

原因：  
因为我在使用@Resource注解时，并没有指定name属性，所以spring通过反射机制使用byName自动注入策略，将配置文件的value值注入了，而不是id值，这就导致spring找到了两个同样的value值，无法选择注入哪一个，最终报错。

解决方案通过指定name属性：

@Resource(name="appclientApplicationName")
        private String appclientApplication;
        @Resource(name="slfclientApplicationName")
        private String slfclientApplication;

No qualifying bean of type [java.lang.String] is defined: expected single matching bean but found 2

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