使用SpringBoot 腳手架搭建的一個簡單的 web demo ，開啟了屬性自動注入，配置文件如下：
@Setter
@Getter
@Configuration
@ConfigurationProperties(prefix = "com.ff")
@EnableConfigurationProperties(FFProperties.class)
public class FFProperties {private String database;
}@Component
public class LocalDataBase {private final FFProperties properties;public LocalDataBase(FFProperties properties) {this.properties = properties;}
}啟動服務失敗，根據錯誤信息很明顯可以判斷出是Spring容器有兩個實例，不知道要注入哪個
***************************
APPLICATION FAILED TO START
***************************Description:Parameter 0 of constructor in com.hoperun.database.LocalDataBase required a single bean, but 2 were found:- ffProperties: defined in file [D:\workspace\demo\target\classes\com\ff\properties\FFProperties.class]- com.ff-com.ff.properties.FFProperties: defined in nullAction:Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumedProcess finished with exit code 0這里配置有個坑，需要注意下，如果注解在配置類的頭上，則不要再寫上類本身了, 按下面的修改，即可正常運行了
@Setter
@Getter
@Configuration
@ConfigurationProperties(prefix = "com.ff")
@EnableConfigurationProperties
public class FFProperties {private String database;
}
