Question

Spring在bean里配置上 <property name="sessionFactory" ref="sessionFactory"/> 就出错

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userEbi' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'userDao' while setting bean property 'userDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'sessionFactory' of bean class [cn.itcast.ssh.user.dao.impl.UserDaoImpl]: Bean property 'sessionFactory' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:329)
at

Answer 1

解决方法如图输入即可：

javaBean在MVC设计模型中是model，又称模型层，在一般的程序中，我们称它为数据层，就是用来设置数据的属性和一些行为，然后我会提供获取属性和设置属性的get/set方法JavaBean是一种JAVA语言写成的可重用组件。为写成JavaBean，类必须是具体的和公共的，并且具有无参数的构造器。

Answer 2

在你的cn.itcast.ssh.user.dao.impl.UserDaoImpl类中加上

private SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory){
this.sessionFactory = sessionFactory;

}

Answer 3

Bean property 'sessionFactory' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

创建的bean，在类中，没有setter方法，还要getter方法，setter方法注入bean

Answer 4

由于在初始化 MyBatis 时，jdbc.properties 文件还没被加载进来，dataSource 的属性值没有被替换，就开始构造 sqlSessionFactory 类，属性值就会加载失败，你的代码改为这个
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
就好了。