Exception in thread "main" while parsing MappingNode in 'reader', line 2, column 1: roncoo: ^ Duplicate key: spring in 'reader', line 22, column 1:
要确保yaml里面的书写格式正确，另外要确保引入了snakeyaml这个jar
spring boot 入门：http://www.roncoo.com/course/view/c99516ea604d4053908c1768d6deee3d