关于java.lang.NoClassDefFoundError: org/springframework/util/unit/DataSize

关于java.lang.NoClassDefFoundError: org/springframework/util/unit/DataSize的问题 spring boot 开启错误

今天在使用mybatis的基于springboot的框架的基础功能包抽离出来的时候，在增加spring yml自定义设置后，在业务项目启动时会报出以下异常。

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APPLICATION FAILED TO START
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Description:

Cannot determine embedded database driver class for database type NONE

Action:

If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (the profiles "dev,redis,config,mongodb,activemq,socketio" are currently active).

原因是需要在启动类的@EnableAutoConfiguration或@SpringBootApplication中添加exclude = {DataSourceAutoConfiguration.class}，排除此类的autoconfig启动以后就可以正常运行。

并且需要使用到

            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        


            org.springframework.boot
            spring-boot
            4.3.8.RELEASE
        

上面两个依赖，更新spring boot的版本
并且mybatis在某个版本后取消了sqlSessionFactory的自动注入，需要显示注入。

然而设置这玩意儿是需要设置dataSource的，于是dataSource也得显示声明

单独配置一个：

@Configuration
public class MybatisConfig {


    @Autowired
    private DataSourceProperties dataSourceProperties;


    @Bean(name = "dataSource")
    public DataSource dataSource() {

        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUrl(dataSourceProperties.getUrl());
        System.out.println(dataSourceProperties.getUrl());
        dataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
        dataSource.setUsername(dataSourceProperties.getUsername());
        dataSource.setPassword(dataSourceProperties.getPassword());

        return dataSource;

    }

    public SqlSessionFactory sqlSessionFactory() throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource());
        return sqlSessionFactoryBean.getObject();
    }
}

tips:
注释：@MapperScan(basePackages = {“xxx.mapper.front”,“xxx,mapper.admin”,“xxx.mapper”})

意思为：改注解内声明对应包下的所有class都是Mapper类
通过使用@MapperScan可以指定要扫描的Mapper类的包的路径