spring boot 启动报错解决方案

报错信息：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'accCouponApi': Unsatisfied dependency expressed through field 'couponService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'couponService': Unsatisfied dependency expressed through field 'couponMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tfAccCouponMapper' defined in file [D:\asiainfo\jsqyzx\account-center\account-center-service\target\classes\com\ai\rai\interests\account\dao\TfAccCouponMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\asiainfo\jsqyzx\operation-center\operation-center-service\target\classes\mybatis\mapper\common_SqlMap.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException: XML fragments parsed from previous mappers already contains value for common.If_Example_Conditon_Valid

分析：

大家来看，这个：

是mybatis报的错，原来是因为，我要启动的工程依赖另一个工程，而这个被依赖的工程扫描的目录下加了这个配置文件之后（这是我之前配置多数据源的时候加上的，之前是Spring boot集成Mybatis，直接在commo里面配置的），无法注入相应的bean（因为在被依赖的工程里面我是脱离了 Spring boot集成Mybatis 功能的，也就是说数据源被我重写了，但是当前启动的工程并没有被重写，所以加载完这个配置文件之后他就不知道该做什么了，只好抛异常），

解决方案：

1.直接删掉这两个文件；

2.改写数据源引用方式（这个会在后面一个博客里面详细写）；