刚学ssm，开始可以运行，但项目修改多次之后，重启tomcat会出现以下启动错误，求解决

刚学ssm，eclipse（oxygen）、tomcat（9.0）、oracle 11g，开始可以运行，但项目修改多次之后，重启tomcat会出现以下启动错误，是工具太新还是什么问题，求解决啊，555
严重: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.mybatis.spring.mapper.MapperScannerConfigurer#0' defined in URL [file:/D:/eclipse-workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/MarketingCheckup/WEB-INF/classes/config/applicationContext.xml]: Cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in URL [file:/D:/eclipse-workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/MarketingCheckup/WEB-INF/classes/config/applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse config resource: class path resource [config/mybatis-config.xml]; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.lang.RuntimeException: Error parsing Mapper 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:

一般出现这种错误都是因为在项目中使用的注解或者配置文件扫描不到你的这个类的问题. 基本都是检查配置文件或者你的注解就能发现问题

Could not resolve type alias = = 这不是写的挺清楚的,别名写错误

spring配置文件中事务配置错误：

 <bean id="sessionFactory"
  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
  <property name="configLocation"
   value="classpath:hibernate.cfg.xml">
  </property>
 </bean>

<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
  <property name="sessionFactory" ref="sessionFactory"></property>
 </bean>
 </bean>