关于Springboot+Mybatis——Error creating bean with name 'sqlSessionFactoryBean--Mapper映射问题

最新推荐文章于 2024-01-30 10:29:08 发布
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#关于Springboot+Mybatis——Error creatin #Error creating bean with name 'sqlS

本文详细解析了在使用MyBatis时遇到的'SqlSessionFactory'创建失败错误，主要原因是mapper配置文件中存在空方法或namespace与mapper包路径不匹配。文章提供了具体的错误堆栈分析及解决方案。

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今天一直被这个 Error creating bean with name ‘sqlSessionFactory’ defined in class path resource 问题困扰了一上午，给大家看一下出的错误`


java.lang.IllegalStateException: Failed to load ApplicationContext

	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125)
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108)
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: 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:\download\demo1\target\classes\mapper\StuMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\download\demo1\target\classes\mapper\StuMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ''.  Cause: java.lang.ClassNotFoundException: Cannot find class: 
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:607)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:743)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:390)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:120)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
	... 24 more
Caused by: 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:\download\demo1\target\classes\mapper\StuMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\download\demo1\target\classes\mapper\StuMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ''.  Cause: java.lang.ClassNotFoundException: Cannot find class: 
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
	... 42 more
Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\download\demo1\target\classes\mapper\StuMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\download\demo1\target\classes\mapper\StuMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ''.  Cause: java.lang.ClassNotFoundException: Cannot find class: 
	at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:596)
	at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:475)
	at org.mybatis.spring.SqlSessionFactoryBean.getObject(SqlSessionFactoryBean.java:616)
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration.sqlSessionFactory(MybatisAutoConfiguration.java:180)
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$d51fb66e.CGLIB$sqlSessionFactory$1(<generated>)
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$d51fb66e$$FastClassBySpringCGLIB$$aff33397.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$d51fb66e.sqlSessionFactory(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
	... 43 more
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\download\demo1\target\classes\mapper\StuMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ''.  Cause: java.lang.ClassNotFoundException: Cannot find class: 
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:122)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:94)
	at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:594)
	... 56 more
Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ''.  Cause: java.lang.ClassNotFoundException: Cannot find class: 
	at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:118)
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:76)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:137)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:130)
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:120)
	... 58 more
Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias ''.  Cause: java.lang.ClassNotFoundException: Cannot find class: 
	at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:120)
	at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149)
	at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116)
	... 62 more
Caused by: java.lang.ClassNotFoundException: Cannot find class: 
	at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:200)
	at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89)
	at org.apache.ibatis.io.Resources.classForName(Resources.java:261)
	at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:116)
	... 64 more

相信有好多人都是这种错误，我找了一上午也没发现，翻了好多的博客。出现这种问题的原因是：

1、namespace与你的mapper（dao）包路径不对在这里插入图片描述

②、就是困扰了我一上午的，你的mapper配置文件里面不能有空的方法，不然他也是报错，因为我个人习惯喜欢先写完再去一个一个去写，结果就报了这个错误，这个时候可以把除了你要用的那个其他的先给删了，然后再去测试一下。

在这里插入图片描述

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最新发布
04-03
<think>好的，我现在需要解决用户在引入Sharding-JDBC时遇到的Spring Bean创建错误，具体是TUserMapper的问题。首先，我得理清楚可能的原因。用户提到的是创建Bean的错误，通常这和Spring的依赖注入有关，可能涉及配置错误或组件扫描的问题。 首先，检查包扫描配置。Sharding-JDBC可能需要特定的配置，或者在多模块项目中，Spring Boot的主启动类可能没有正确扫描到Mapper接口所在的包。用户需要确认@SpringBootApplication或@ComponentScan注解是否包含了Mapper所在的包。例如，如果Mapper在com.example.dao包下，而主类在com.example，可能需要显式添加@ComponentScan("com.example.dao")。 其次，数据源配置是否正确。Sharding-JDBC的配置可能覆盖了原有的数据源设置，导致MyBatis无法找到合适的数据源。需要检查application.yml或application.properties中的sharding规则是否正确，特别是数据源的名称和配置是否存在冲突。比如，是否正确定义了数据源名称如ds1, ds2，并在sharding规则中正确引用。 第三，依赖冲突的可能性。引入Sharding-JDBC可能会带来一些依赖版本的问题，特别是和Spring Boot、MyBatis的版本兼容性。用户需要确认使用的Sharding-JDBC版本是否与当前项目的Spring Boot版本兼容。例如，Sharding-JDBC 4.x对应Spring Boot 2.x，而5.x需要Spring Boot 3.x。如果版本不匹配，可能需要升级或降级相关依赖。 另外，检查MyBatis的配置是否正确。例如，是否在配置类中使用了@MapperScan注解指定了Mapper接口的位置，或者在application.yml中配置了mybatis.mapper-locations，确保XML映射文件的位置正确。如果路径不正确，MyBatis无法找到对应的SQL映射，导致Bean创建失败。 还有可能是代理生成问题。MyBatis通过动态代理生成Mapper接口的实现类，如果Sharding-JDBC的某些配置干扰了这个过程，可能导致代理类无法生成。可以尝试在Mapper接口上添加@Repository注解，或者在配置类中明确声明Mapper的扫描路径。 此外，查看具体的错误日志信息非常重要。错误信息中可能会提示无法注入TUserMapper，或者创建Bean失败的原因，比如缺少依赖项、配置错误等。根据日志中的具体异常信息，可以更有针对性地排查问题，比如ClassNotFoundException可能意味着依赖缺失，而SQLException可能指向数据源配置错误。 最后，建议用户按照步骤逐步排查：先确认包扫描，再检查数据源配置，然后验证依赖版本，最后查看日志中的详细错误。如果问题依然存在，提供完整的错误日志和配置片段有助于进一步分析。</think>针对Sharding-JDBC集成Spring Boot时出现的`Error creating bean 'TUserMapper'`问题，以下是分步解决方案： --- ### 一、检查包扫描配置 1. **主启动类添加注解** 确保`@SpringBootApplication`或`@MapperScan`明确扫描Mapper接口所在包： ```java @SpringBootApplication @MapperScan("com.example.mapper") // 修改为实际Mapper包路径 public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } } ``` 2. **多模块项目特殊处理** 若采用多模块结构，需在`@SpringBootApplication`中追加扫描： ```java @SpringBootApplication(scanBasePackages = {"com.example.main", "com.example.mapper"}) ``` --- ### 二、验证数据源配置 1. **Sharding-JDBC基础配置示例** ```yaml spring: shardingsphere: datasource: names: ds1, ds2 # 数据源名称列表 ds1: type: com.zaxxer.hikari.HikariDataSource driver-class-name: com.mysql.cj.jdbc.Driver jdbc-url: jdbc:mysql://localhost:3306/db1 username: root password: 123456 ds2: ... # 同理配置其他数据源 rules: sharding: tables: t_user: actual-data-nodes: ds$->{1..2}.t_user_$->{0..1} # 分表规则示例 ``` 2. **关键检查点** - 数据源名称`names`与分片规则引用的名称是否一致 - 避免与其他数据源工具（如Druid）产生配置冲突 --- ### 三、处理依赖冲突 1. **版本匹配关系** | Spring Boot | Sharding-JDBC | MyBatis | |-------------|---------------|----------------| | 2.x.x | 4.1.1 | 3.5.6+ | | 3.x.x | 5.4.1 | 3.5.13+ | 2. **排除冲突依赖** ```xml <dependency> <groupId>org.apache.shardingsphere</groupId> <artifactId>sharding-jdbc-spring-boot-starter</artifactId> <version>4.1.1</version> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </exclusion> </exclusions> </dependency> ``` --- ### 四、MyBatis配置强化 1. **显式声明Mapper路径** ```yaml mybatis: mapper-locations: classpath:mapper/*.xml # XML文件路径 type-aliases-package: com.example.entity # 实体类包路径 ``` 2. **添加完整性注解** ```java @Repository // 强化Bean识别 public interface TUserMapper { @Select("SELECT * FROM t_user WHERE id = #{id}") TUser selectById(@Param("id") Long id); } ``` --- ### 五、错误日志分析 典型错误场景对照表： | 错误现象 | 解决方案 | |----------------------------------|-----------------------------------| | `No qualifying bean of type...` | 检查包扫描配置(步骤一) | | `Failed to determine datasource` | 验证Sharding配置完整性(步骤二) | | `BeanCreationException` | 排查依赖冲突(步骤三) | | `BindingException` | 确认XML映射文件存在(步骤四) | --- ### 六、验证流程 1. 清理并重新编译项目 ```bash mvn clean install -DskipTests ``` 2. 启动时开启DEBUG日志 ```properties logging.level.root=DEBUG ``` 3. 观察控制台输出中以下关键节点： - `Initializing ShardingSphere datasource` - `Mapped SQL statement` - `Creating bean for mapper interface` ---
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