: Application startup failedorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'helloController': Injection of auautowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'cupSize' in value "${cupSize}"
http://www.imooc.com/learn/767: 如果是用IDEA+maven的话，换国内的源，然后run，不然会提示“Exception in thread "main" java.lang.NoClassDefFoundError”是jar包没有下载成功。例如用IDEA自带的maven的时候，改一下maven源的配置：JetBrains\IntelliJ IDEA 2017.2.5\plugins\maven\lib\maven3\conf\settings.xml：加上阿里云的源。http://www.cnblogs.com/phpdragon/p/7216626.html
