1.若是使用了多数据源配置，请检查 DataSourceConfig配置类：

将SqlSessionFactoryBean改为mybatis-plus里面的MybatisSqlSessionFactoryBean

@Bean(name = "testSqlSessionFactory")
	@Primary
	public SqlSessionFactory testSqlSessionFactory(@Qualifier("testDataSource") DataSource dataSource) throws Exception {
		MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
        //SqlSessionFactoryBean bean = new SqlSessionFactoryBean();

		bean.setDataSource(dataSource);
		//对应mybatis.type-aliases-package配置
		bean.setTypeAliasesPackage("com.cainiao.manage.pojo");
		//对应mybatis.mapper-locations配置
		bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));
		//开启驼峰映射
		bean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
		return bean.getObject();
	}

2.若还是报错，检查mybaitis-plus 版本，可用2.x的版本试试

        <!-- mybatisplus与springboot整合 -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatisplus-spring-boot-starter</artifactId>
    <version>1.0.5</version>
</dependency>
<!-- MP 核心库 -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>2.1.8</version>
</dependency>
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>
<!-- 模板引擎 代码生成 -->
<dependency>
    <groupId>org.apache.velocity</groupId>
    <artifactId>velocity</artifactId>
    <version>1.7</version>
</dependency>