使用SSH框架，出现BeanCreationException错误，纠结了两天了，求大神指导！

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serviceActionBean' defined in ServletContext resource [/WEB-INF/bean.xml]: Cannot resolve reference to bean 'serviceDao' while setting bean property 'serviceDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serviceDao' defined in ServletContext resource [/WEB-INF/bean.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'sessionFactory' of bean class [com.swu.dao.impl.ServiceDao]: 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?
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serviceDao' defined in ServletContext resource [/WEB-INF/bean.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'sessionFactory' of bean class [com.swu.dao.impl.ServiceDao]: 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?
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'sessionFactory' of bean class [com.swu.dao.impl.ServiceDao]: 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?

各层的代码如下

你的setter和getter方法检查检查

[/WEB-INF/bean.xml]: Cannot resolve reference to bean 'serviceDao' while setting bean property 'serviceDao看看这句话