java.lang.NoClassDefFoundError: org/apache/ibatis/mapping/DatabaseIdProvider

原因：mybatis  yu mybatis-spring的版本不兼容

<dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis</artifactId>

            <version>3.0.1</version>

        </dependency>

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis-spring</artifactId>

            <version>1.2.2</version>

        </dependency>

两个mybatis版本不兼容，把第一个dependency的mybatis版本提高的最新就可以解决这个问题了。改变后的结果如下所示：

<dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis</artifactId>

            <version>3.2.7</version>

        </dependency>

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis-spring</artifactId>

            <version>1.2.2</version>

        </dependency>