Spring中常见问题

1.NoSuchBeanDefinitionException

2.'..Service' that could not be found service找不到

3.port 80 was already in use 端口号被占用

4.TemplateInputException 模板解析异常或找不到模板

• 1.检查模板所在的目录是否与配置的前缀目录相同
• 2.检查返回的模板是否存在,返回值类型是否一致
• 3.检查配置前缀时是否以"/"斜杠结尾
• 4.控制层的url与客户端的ur是否一致

5. 404异常 访问资源不存在

6. 500异常 500异常要查看控制台

Mybatis中常见问题

1.springboot中添加maven依赖

2.BadSqlGrammarException 错误的sql语句

3.BindingException 绑定异常

• 1.检查映射文件的路径配置与实际存储位置是否一致
• 2.检查dao接口的类名是否与映射文件的namespace值相同(不能有空格)
• 3.检查dao接口中的方法名是否在映射文件中有对应的id

4.IllegalArgumentException

原因:同样说我sql映射是否出现了重复性的定义(例如:分别以注解方式和xml配置文件方式进行定义,也就是说在同一个namespace下出现了重复的元素id)

5.SAXParseException xml解析问题

补充

问题一：Mapper类 autowired失败

原因：扫描mapper包没有配置或配置不正确

解决：

方案一：

1. 启动类加@MapperScan("mapperPackagePath")

方案二：

增加配置类：

package com.yx.readingwebsite.config; import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; /** * MapperScannerConfigurer 配置DAO层 */ @Configurationpublic class MyBatisMapperScannerConfig { @Bean public MapperScannerConfigurer getMapperScannerConfigurer(){ MapperScannerConfigurer msc = new MapperScannerConfigurer(); msc.setSqlSessionFactoryBeanName("sqlSessionFactory"); msc.setBasePackage("com.yx.readingwebsite.mapper"); return msc; }}

问题二：Mapper扫描成功后，继续报错，org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):

原因：xml的mapper SQL 和 Mapper接口没有绑定

解决：

方案一：全局配置文件application.yml增加mybatis配置【xml mapper包在resource目录下】

mybatis: mapper-locations: classpath:mapper/*.xml

方案二：增加配置类

package com.yx.readingwebsite.config; import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.Resource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import org.springframework.transaction.PlatformTransactionManager;import org.springframework.transaction.annotation.EnableTransactionManagement;import org.springframework.transaction.annotation.TransactionManagementConfigurer; import javax.sql.DataSource; /** * 配置MyBatis,引入数据源，sqlSessionFactory,sqlSessionTemplate,事务管理器 */ @Configuration //配置类@EnableTransactionManagement //允许使用事务管理器public class MyBatisModelConfig implements TransactionManagementConfigurer { @Autowired private DataSource dataSource; @Bean(name = "sqlSessionFactory") public SqlSessionFactory getSqlSessionFactory(){ SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean(); ssfb.setDataSource(dataSource); //设置数据源 ssfb.setTypeAliasesPackage("com.yx.readingwebsite.model"); //设置扫描模型包【po】 try { Resource[] resources = new PathMatchingResourcePatternResolver() .getResources("classpath:mapper/*.xml"); ssfb.setMapperLocations(resources); return ssfb.getObject(); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(); } } @Bean //获得Session 模板，从而获得Session public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){ return new SqlSessionTemplate(sqlSessionFactory); } @Override //事务管理器 public PlatformTransactionManager annotationDrivenTransactionManager() { return new DataSourceTransactionManager(dataSource); }}

需要注意的是，xml版的mybatis一定要在sqlSessionFactory中指定mapperLocations,即下图

总结：
两种配置方案。方案一，使用配置类；方案二，使用配置文件。完整配置如下：

方案一：配置类

package com.yx.readingwebsite.config; import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.Resource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import org.springframework.transaction.PlatformTransactionManager;import org.springframework.transaction.annotation.EnableTransactionManagement;import org.springframework.transaction.annotation.TransactionManagementConfigurer; import javax.sql.DataSource; /** * 配置MyBatis,引入数据源，sqlSessionFactory,sqlSessionTemplate,事务管理器 */ @Configuration //配置类@EnableTransactionManagement //允许使用事务管理器public class MyBatisModelConfig implements TransactionManagementConfigurer { @Autowired private DataSource dataSource; @Bean(name = "sqlSessionFactory") public SqlSessionFactory getSqlSessionFactory(){ SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean(); ssfb.setDataSource(dataSource); //设置数据源 ssfb.setTypeAliasesPackage("com.yx.readingwebsite.model"); //设置扫描模型包【po】 try { Resource[] resources = new PathMatchingResourcePatternResolver() .getResources("classpath:mapper/*.xml"); ssfb.setMapperLocations(resources); return ssfb.getObject(); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(); } } @Bean //获得Session 模板，从而获得Session public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){ return new SqlSessionTemplate(sqlSessionFactory); } @Override //事务管理器 public PlatformTransactionManager annotationDrivenTransactionManager() { return new DataSourceTransactionManager(dataSource); }}package com.yx.readingwebsite.config; import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.springframework.boot.autoconfigure.AutoConfigureAfter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; /** * MapperScannerConfigurer 配置DAO层 */ @Configuration@AutoConfigureAfter(MyBatisModelConfig.class)public class MyBatisMapperScannerConfig { @Bean public MapperScannerConfigurer getMapperScannerConfigurer(){ MapperScannerConfigurer msc = new MapperScannerConfigurer(); msc.setSqlSessionFactoryBeanName("sqlSessionFactory"); msc.setBasePackage("com.yx.readingwebsite.mapper"); return msc; }}

方案二：配置文件 application.yml

spring: datasource: url: jdbc:mysql://127.0.0.1:3306/readingWebsite?useUnicode=true&characterEncoding=utf-8 username: password: driver-class-name: com.mysql.jdbc.Driver max-active: 100 max-idle: 10 max-wait: 10000 default-auto-commit: false time-between-eviction-runs-millis: 30000 min-evictable-idle-time-millis: 30000 test-while-idle: true test-on-borrow: true test-on-return: true validation-query: SELECT 1 mybatis: mapper-locations: classpath:mapper/*.xmlpackage com.yx.readingwebsite; import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication@MapperScan("com.yx.readingwebsite")public class ReadingWebsiteApplication { public static void main(String[] args) { SpringApplication.run(ReadingWebsiteApplication.class, args); } }

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